18.2. System of onboard diagnostics - the principle of functioning and codes of malfunctions

Data on diagnostic units


Check of serviceability of functioning of components of systems of injection and decrease in toxicity of the fulfilled gases is made by means of the universal digital measuring instrument (multimeter)


Use of the digital measuring instrument is preferable for several reasons. First, on analog devices it is rather difficult (sometimes, it is impossible), to define result of the indication to within the 100-th and thousand shares while at inspection of the contours including electronic components in the structure, such accuracy is of particular importance. The second, not less important, the fact that the internal contour of a digital multimeter, has rather high impedance is the reason (internal resistance of the device makes 10 megohms). As the voltmeter is connected to the checked chain in parallel, the accuracy of measurement of subjects is higher, than smaller current will pass through actually device. This factor is not essential at measurement of rather high values of tension (9 ÷ 12 V), however becomes defining at diagnostics of the elements giving low-voltage signals, such as, for example, l-probe where it is about measurement of shares of volt.

 


Parallel observation of parameters of signals, resistance and tension in all chains of management is possible by means of the splitter included consistently in the socket of the control unit of the engine. At the same time on the switched-off, working engine or during the movement of the car, measurement of parameters of signals on splitter plugs is performed from what the conclusion about possible defects is drawn.

Special diagnostic scanners or testers with a certain cartridge are used to diagnostics of electronic systems of the engine, automatic transmission, ABS, SRS. Besides, it is possible to use the expensive specialized automobile diagnostic computer which is specially developed for full diagnostics of the majority of systems of modern cars or the ordinary computer with a set of the interface devices to this purpose.

In principle, reading of the codes of malfunctions which are written down in memory of system of self-diagnostics on some models can be made also on the indicator "check the engine" on the control panel.

For performing diagnostics we recommend to you to ask for the qualified help of experts.

16-contact diagnostic socket of system of onboard diagnostics of OBD II

 

Purpose of conclusions of the diagnostic socket 445:

conclusion No.

Appointment

4
Connection with the case
5
The case - an alarm conclusion

6
The control unit, Motronic M2.8.1, conclusion 13, through contact 2, the 70-contact socket behind a water-collecting compartment
7
Control unit, Trionic (conclusion 33), Motronic M2.8.1 (conclusion 55)
The control unit of the anticreeping alarm system with an immobilizator, a conclusion 19
Control unit, Motronic M5.2, conclusion 88
Control unit, Saab Trionic OBDII, conclusion 33
8
Traveling computer (conclusion 38)
Control unit of the automatic conditioner of air (conclusion 12)
Control unit of the anticreeping alarm system (conclusion 19)
Control unit of system of anti-blocking of brakes of ABS (conclusion 42)
Control unit of security systems of SRS (conclusion 9)
The control unit with memory of situation and electroadjustment of a driver's seat
Control unit of the TCS traction control system (conclusion 9)
11
The control unit of a driver's seat with electroadjustment, through contact 6, the 8-contact socket under a driver's seat
14
Relay, conclusion 5
15
ABS control unit, conclusion 23
16
Plus batteries through a safety lock 23. Energized at any position of the lock of ignition. Chain 30

General description of the OBD II system

Several diagnostic devices making monitoring of separate parameters of systems of decrease in toxicity and fixing the revealed refusals in memory of the onboard processor in the form of individual codes of malfunctions are a part of the OBD system. The system makes also check of sensors and actuation mechanisms, controls vehicle service cycles, provides a possibility of storing even of the failures which are quickly arising in the course of work and cleaning of the block of memory.

All models described in the present manual are equipped with system of onboard diagnostics of OBD. A basic element of system is the onboard processor more often called by the electronic module of management (ESM), or the module of management of functioning of the power unit (RSM). RSM is a brain of a control system of the engine. Basic data arrive on the module from various information sensors and other electronic components (switches, the relay, etc.). On the basis of the analysis of the data arriving from information sensors, and according to the basic parameters put in the processor memory, RSM develops commands for operation of various operating relays and actuation mechanisms, carrying out thereby adjustment of working parameters of the engine, and providing maximum efficiency of its return at the minimum fuel consumption. Data read-out of the processor memory of OBD-II is made by means of the special scanner connected to the 16-contact diagnostic socket 445 of reading of the database (Saab Trionic) located under the dashboard from the driver's party of the car. Also diagnostics can be carried out at connection of the device to the small black socket 444 close to the Trionic control unit, under a seat of the forward passenger. On the Bosch LH 2.4, 2.4.1 and 2.4.2 Jetronic systems the diagnostic socket can be located under a back seat, near the AT selector or in a motive compartment, near a windshield, at the left. Remark: On separate models, reading of the codes of malfunctions which are written down in memory of system of self-diagnostics can be made by means of a lamp "Check the engine".

Special guarantee certificates with the extended validity extend to service of components of control systems of engine / decrease in toxicity of the fulfilled gases. It is not necessary to make attempts of independent performance of failure diagnostics of RSM or replacement of components of system, to an exit of terms of these obligations, - address specialists of company car repair shops.

Information sensors

Oxygen sensors (l-probes)

The sensor develops a signal which amplitude depends on a difference of content of oxygen (O2) in the fulfilled gases of the engine and external air.

Sensor of provision of a bent shaft (ICR)

The sensor informs RSM on the provision of a bent shaft and turns of the engine. This information is used by the processor during the determining of the moments of injection of fuel and installation of a corner of an advancing of ignition.

Sensor of position of pistons (CYP)

On the basis of the analysis of the signals of RSM arriving from the sensor calculates position of the piston of the first cylinder and uses this information when determining the moments and the sequence of injection of fuel in engine combustion chambers.

BMT (TDC) sensor

The signals developed by the sensor are used by RSM when determining installations of a corner of an advancing of ignition at engine launch.

Sensor of temperature of cooling liquid of the engine (EST)

On the basis of information of ECM/PCM arriving from the sensor carries out necessary corrections of composition of air-fuel mix and a corner of an advancing of ignition, and also controls work of the EGR system.

The sensor of temperature of the soaked-up air (IAT)

RSM uses information arriving from the IAT sensor at corrections of a stream of fuel, installations of a corner of an advancing of ignition and management of functioning of the EGR system.

Sensor of provision of a butterfly valve (TPS)

The sensor is located on the case of a throttle and connected to an axis of a butterfly valve. Determines the angle of opening of a butterfly valve (is operated by the driver from the accelerator pedal) by amplitude of the given TPS of a signal of RSM and as appropriate corrects supply of fuel to inlet ports of combustion chambers. The failure of the sensor, or weakening of its fastening leads to interruptions of injection and violations of stability of turns of idling.

The sensor of absolute pressure in the pipeline (MAR)

The sensor controls the depression depth variations in the inlet pipeline connected with changes of turns of a bent shaft and load of the engine and will transform the obtained information to an amplitude signal. RSM uses information delivered by the MAR and IAT sensors at thin corrections of supply of fuel.

Sensor of atmospheric pressure

The sensor develops the amplitude signal proportional to changes of atmospheric pressure which is used by RSM when determining duration of the moments of injection of fuel. The sensor is built in the RSM module and is not subject to service in an individual order.

Detonation sensor

The sensor reacts to change of level of the vibrations connected with detonations in the engine. On the basis of information of RSM arriving from the sensor carries out the corresponding correction of a corner of an advancing of ignition.

Sensor of speed of the movement of the car (VSS)

As appears from its name, the sensor informs the processor on the current speed of the movement of the car.

Sensor of size of opening of the EGR valve

The sensor notifies RSM on EGR valve plunger shift size. The obtained information is used then the processor at management of functioning of system of recirculation of the fulfilled gases.

Pressure sensor in the fuel tank

The sensor is a component of system of catching of fuel evaporations (EVAP) and serves for tracking of pressure of vapors of gasoline in a tank. On the basis of information of RSM arriving from the sensor issues commands for operation of electromagnetic valves of a purge of system.

Sensor switch of pressure of system of hydrostrengthening of a wheel (PSP)

On the basis of information of RSM arriving from the PSP sensor switch provides increase in turns of idling due to operation of the IAC sensor for the purpose of compensation of the increasing loads of the engine connected with functioning of the steering hydraulic booster at commission of maneuvers.

Transmission sensors

In addition to the data arriving from VSS, RSM obtains also information from the sensors placed in the transmission, or connected to it. Are among such sensors:
   (a) RPM meter of a secondary (radical) shaft and
   (b) RPM meter of an intermediate shaft.

Sensor switch of management of inclusion of a clutch coupling of the conditioner of air

When giving power supply from the battery to the electromagnetic valve of the K/V compressor the corresponding information signal arrives on RSM which regards it as the evidence of increase of load of the engine and as appropriate corrects turns of its idling.

Actuation mechanisms

Main PGM-FI relay (relay of the fuel pump)

RSM makes activation of the relay of the fuel pump when turning the ignition key in situation START or RUN. At inclusion of ignition activation of the relay provides rise in pressure in a power supply system. More detailed information on the main relay is provided in the Head Toplivnaya and exhaust systems.

Fuel injectors

RSM provides individual inclusion of each of injectors according to an established order of ignition. Besides, the module controls duration of opening of injectors determined by the width of the operating impulse measured in milliseconds and defining amount of the fuel injected into the cylinder. More detailed information on the principle of functioning of system of injection, replacement and service of injectors is provided in the Head Toplivnaya and exhaust systems.

Module of management of ignition (ICM)

The module operates functioning of the coil of ignition, defining the required basic advancing on the basis of the developed RSM of teams.

Valve of stabilization of turns of idling (IAC)

The IAC valve carries out a dosage of amount of the air bypassed bypassing a butterfly valve when the last is closed or holds idling position. RSM operates opening of the valve and formation of the resulting air stream.

Electromagnetic valve of a purge of a coal adsorber

The valve is a component of system of catching of fuel evaporations (EVAP) and, working at the command of RSM, makes production of the fuel vapors which accumulated in an adsorber in the inlet pipeline for the purpose of burning them in the course of normal functioning of the engine.

Electromagnet of management of a purge of a coal adsorber

The electromagnet is used by RSM when checking by the OBD-II system of serviceability of functioning of the EVAP system.

Reading of codes of malfunctions

Information contents of categories of a code in the Saab Trionic system

Look P 0 3 8 0 from left to right:

1 category

P
power unit
B
body
With
chassis

2 category

Code source

0
standard SAE
1
expanded - the producer

3 category

System

0
system in general
1
air admixture
(air/fuel induction)
2
fuel injection
3
system of ignition or
admissions of ignition
4
additional control of release (auxillary
emission control)
5
speed of the car and management х.х.
6
entrance and output signals of the control unit
7
transmission

4,5 categories

Serial number

malfunctions of a component or chain
(00-99)

At detection of the malfunction repeating in a row on two trips, RSM issues the command for inclusion of the control lamp which is built in in an instrument guard "Check the engine", called also by the indicator of refusals. The lamp will continue to burn until memory of system of self-diagnostics is not cleared of the codes of the revealed malfunctions brought in it (address Specifications). Reading of codes of malfunctions in the OBD-II system can be made in various ways. The main way is reading by means of the devices described above connected to the diagnostic socket. Other ways are possible not on all models. On some models the blinking code can be считан on a lamp "Check the engine", after short-term connection of the plug represented on an illustration to the case, or the plug No. 6 of the 16-contact socket.

Without starting the engine, include ignition, - a control lamp "Check the engine" has to light up, otherwise it should be replaced. Having checked serviceability of a condition of a lamp, again switch off ignition.

Method of reading of the blinking codes on a lamp "Check the engine"

Connect by means of an auxiliary wire the conclusion shown in the drawing to weight via the button. 3 versions of the diagnostic socket on models with the Bosh LH system of engine management are shown

Connect the auxiliary button to the case and the plug of the diagnostic socket specified illustrations.

Include ignition and press the button. The control lamp has to blink 1 time. Release the button. If in the processor memory codes of the malfunctions taking place are brought, they will begin to be highlighted consistently by a control lamp "Check the engine" on the control panel of the car.

Five-unit codes are given five series of flashes. Value of each category corresponds to the number of flashes of a lamp in the corresponding series. Figure from 1 to 9 are transferred by short flashes, figure 0 - one long flash. Flashes in one series are divided by short pauses, series among themselves - long.

For extraction of the following code repeat procedures of paragraphs 33, 34.

For repeated extraction of codes press and hold the button still control lamp will not blink 2 times.

The code 00000 given by five long flashes indicates the end of delivery of a code or lack of malfunctions.

Cleaning of memory of Bosch LH 2.4, 2.4.1 and 2.4.2 Jetronic

Consider all codes of malfunctions to delivery of a code 00000.

Press and hold the button until the control lamp does not blink 3 times.

Cleaning of memory of OBD-II

When entering a code of malfunction in memory of RSM on an instrument guard of the car the control lamp "Lights up check the engine". The code remains written down in memory of the module.

For cleaning of memory of ESM connect the scanner to system and choose the CLEARING COEDS function (Removal of codes) in its menu. Further follow the instructions highlighted on the device or at once for 30 seconds take from the nest in the assembly block EFI safety lock. Alternatively cleaning of memory of system can be made by removal of a fusible insert (the main safety lock of system of onboard power supply), it is possible also just to disconnect a positive wire from the battery.



It is not desirable to make cleaning of memory of OBD by a detachment of a negative wire from the battery as it will lead to deleting of adjusting parameters of the engine and violation of stability of its turns for a short time after primary start.

If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action!

Shutdown of the battery also leads to removal of settings of the receiver for favourite radio stations.

In order to avoid damage of ESM its shutdown and connection should be made only at the switched-off ignition!


Track that memory of system was cleared before installation on the engine of new components of systems of decrease in toxicity of the fulfilled gases. If before start of system after replacement of the failed information sensor not to make cleaning of memory of refusals, RSM will bring in it a new code of malfunction. Cleaning of memory allows the processor to make change-over on new parameters. At the same time the first 50 ÷ 20 minutes after primary start of the engine some violation of stability of its turns can take place.

List of codes

You can learn interpretation of the OBD II codes for your model also on the website www.obdii.com

Saab Trionic

1994 - 1998

Characteristic

Value

P0000
Lack of codes of malfunctions in memory of system
P0102
Short circuit on the case or low level of a signal of the MAF/MAP sensor
P0103
Short circuit on or the high level of a signal of the MAF/MAP sensor
Malfunction P0105 in a chain of the sensor of absolute pressure (MAR) / Sensor of atmospheric pressure
P0106
Violation of functioning of the sensor of absolute pressure (MAR) / Sensor of atmospheric pressure
P0107
Break or short circuit on the case of a chain of the sensor of the MAR / Sensor of atmospheric pressure
P0108
Short circuit on a chain of the sensor of the MAR / Sensor of atmospheric pressure
P0110
Violation in a chain of the sensor of temperature of the soaked-up air (IAT)
P0112
Short circuit of a chain of the IAT sensor on the case
P0113
Break or short circuit on an IAT sensor chain
P0115
Absence or excessively low level of a signal of the sensor of temperature of a cooler (eats)
P0116
Excessively high level of a signal of an eats sensor / problem with efficiency of return of the engine
P0117
Short circuit of a chain of the eats sensor on the case
P0118 Break or short circuit on the eats sensor chain
P0120
Malfunctions in a chain of the sensor of provision of a butterfly valve (TPS)/switch A
P0121
Violation in a chain of TPS/switch A; Efficiency of return of the engine Is reduced
P0122
Low entrance signal of the TPS/sensor A sensor of provision of a pedal
P0123
High entrance signal of the TPS/sensor A sensor of provision of a pedal
P0130
Malfunction in a chain of the verkhnepotochny l-probe (the right number of cylinders on the V-shaped engine)
P0131
The low voltage of a chain of the verkhnepotochny warmed-up l-probe (the right number of cylinders on the V-shaped engine)
P0132
High voltage of the verkhnepotochny warmed-up l-probe (the right number of cylinders on the V-shaped engine)
P0134
Lack of a signal of the verkhnepotochny l-probe (the right number of cylinders on the V-shaped engine)
P0135
Violation in a chain of heating of the verkhnepotochny l-probe (excessively high voltage) (the right number of cylinders on the V-shaped engine)
P0151
Violation of serviceability of functioning of tracking of impoverishment of mix of the verkhnepotochny l-probe (the left number of cylinders on the V-shaped engine)
P0152
Violation of serviceability of tracking of enrichment of mix of the verkhnepotochny l-probe (the left number of cylinders on the V-shaped engine)
P0154
High voltage of the verkhnepotochny l-probe (the left number of cylinders on the V-shaped engine)
P0170
Reimpoverishment or reenrichment of air-fuel mix (the right number of cylinders on the V-shaped engine)
P0171
Reimpoverishment of air-fuel mix (the right number of cylinders on the V-shaped engine)
P0172
Reenrichment of air-fuel mix (the right number of cylinders on the V-shaped engine)
P0174
The regrown poor injection (the left number of cylinders on the V-shaped engine)
P0175
The reenriched injection (the left number of cylinders on the V-shaped engine)
P0322
Lack of a signal in an entrance contour of a chain of control of turns of the engine of a control system of distribution of ignition
P0325
The sensor of a detonation 1 is faulty (the right number of cylinders on the V-shaped engine)
P0326
The sensor of a detonation 1 is faulty (the right number of cylinders on the V-shaped engine)
P0331
The sensor of a detonation 2 is faulty (the left number of cylinders on the V-shaped engine)
P0335
Signal of turns engine / Malfunction in a chain of the sensor A of provision of a bent shaft of ICR
P0336
Sensor A of provision of a bent shaft of ICR
P0341
Violation of serviceability of functioning of the SMR sensor
P0342
Short circuit on weight in a SMR sensor chain
P0343
Short circuit on in a SMR sensor chain
P0443 - P0446
Malfunction in a chain of the valve of management of a purge of a coal adsorber of EVAP
P0500, P0501
Malfunction in a VSS car speed sensor chain
P0502
Lack of a signal or short circuit on the VSS sensor case
P0505
Malfunction in a chain of the IAC sensor of stabilization of turns of idling
P0605
Error of ROM (ROM) of the module of management
P1001
Valve of a purge of a coal adsorber of the EVAP system
P1002
Valve of a purge of a coal adsorber of the EVAP system
P1011
Injector - the cylinder 1
P1012
Injector - the cylinder 1
P1021
Injector - the cylinder 2
P1022
Injector - the cylinder 2
P1031
Injector - the cylinder 3
P1032
Injector - the cylinder 3
P1041
Injector - the cylinder 4
P1042
Injector - the cylinder 4
P1051
Injector - the cylinder 5
P1052
Injector - the cylinder 5
P1061
Injector - the cylinder 6
P1062
Injector - the cylinder 6
P1130
Big current of a heater lambda probe
P1135
Small current of a heater lambda probe 1
P1172
The measuring instrument of mass of air - poor mix
P1173
The measuring instrument of mass of air - rich mix
P1206
Relay of the air pump
P1207
Relay of the air pump
P1211
Valve of management of turns of idling (IAC)
P1212
Valve of management of turns of idling (IAC)
P1251
Control lamp of CHECK (Check the engine)
P1252
Control lamp of CHECK (Check the engine)
P1300
Signal of restriction of effort
P1301
Signal of restriction of effort
P1322
RPM meter of the engine (RPM) sensor-(ETC)
P1443
Malfunction in a valve chain 2 managements of a purge of a coal adsorber of EVAP
P1444
Big current of the EVAP valve
P1445
Small current of the EVAP valve
P1500
Supply voltage deviations
P1560
Low level of a signal of system of stabilization of stability (TCS)
P1561
High level of a signal of system of stabilization of stability (TCS)
P1601
Relay of the fuel pump
P1602
Relay of the fuel pump
P1621
Air conditioner relay
P1622
AC air conditioner relay
P1628
Supply voltage deviations
P1630
AC air conditioner relay
P1631
AC air conditioner relay
P1651
Memory (RAM) of the control unit (ECM)
P1652
Memory (ROM) of the control unit (ECM)

Bosch LH 2.2 systems

Characteristic

Value

E001
There is no signal of turns of the engine
E002
Cooler temperature sensor signal
E003
The sensor switch defines a closed position of a butterfly valve
E005
The control unit is not connected to the case
E006
The measuring instrument of mass of the soaked-up air is not connected to the case
E007
There is no signal of the measuring instrument of mass of the soaked-up air
E008
There is no heat of thread of the measuring instrument of mass of the soaked-up air
E009
Power supply of the relay of management of the engine does not move
E010
Signal of the valve of management of idling air
E011
Connection with the case of the control unit of the engine
E012
Break in a chain of the sensor switch of provision of a butterfly valve
E013
Signals of injectors
E014
Break in a chain of the measuring instrument of mass of the soaked-up air
E017
Chain of management of the relay of the fuel pump
E018
Engine control unit supply voltage
E020
Signal warmed up a lambda probe
E021
Chain of management of the relay of management of the engine
E023
Signal of the valve of management of idling air
E024
Signal of loading of the module of management of ignition
E025
Connection with the case of the control unit of the engine
E101
Low turns of a starter
E102
Short circuit in a cooler temperature sensor chain
E103
The sensor switch defines a closed position of a butterfly valve
E107
Too high signal of the measuring instrument of mass of the soaked-up air
E108
Constant heat of thread of the measuring instrument of mass of the soaked-up air
E109
Supply voltage of the relay of management of the engine
E112
The chain of the sensor of provision of a butterfly valve is closed
E113
Signals of injectors
E120
Too low signal warmed up a lambda probe
E207
Too low signal of the measuring instrument of mass of the soaked-up air
E220
Too high signal warmed up a lambda probe
A/C
Porosity of an impulse of the valve of management of idling air

Bosch LH 2.4, 2.4.1 and 2.4.2 systems

1987 - 1988

Characteristic

Value

E001
There is no ignition impulse on a conclusion 1
E002
Contacts of the sensor switch of provision of a butterfly valve are opened
E003
The sensor switch defines the open provision of a butterfly valve
E005
Conclusion of the 5th control unit is not connected to the case
E006
The measuring instrument of mass of the soaked-up air is not connected to the case
E007
There is no signal of the measuring instrument of mass of the soaked-up air
E008
There is no heat of thread of the measuring instrument of mass of the soaked-up air
E009
Food from a conclusion of 33 relays of management of the engine does not move
E018
There are no impulses of injectors
E020
Chain of management of the relay of the fuel pump
E021
Chain of management of the relay of management of the engine
E024
There is no signal warmed up a lambda probe

E033
There is no signal of the valve of management of idling air
E102
The sensor switch defines a closed position of a butterfly valve
E103
The sensor switch defines the open provision of a butterfly valve
E107
Too high signal of the measuring instrument of mass of the soaked-up air
E108
Constant heat of thread of the measuring instrument of mass of the soaked-up air
E109
Supply voltage of the relay of management of the engine is lowered
E118
E124
Too high signal warmed up a lambda probe
E207
Too low signal of the measuring instrument of mass of the soaked-up air
E224
Too low signal warmed up a lambda probe

1989 - 1993

The blinking code

Malfunction

12111
Malfunction lambda probe (quality of working mix idling)
12112
Malfunction a lambda probe (quality of working mix at the movement of the car)
12113
The valve of management of idling, porosity of impulses is small (the raised turns х.х)
12114
The valve of management of idling, porosity of impulses is big (the lowered turns х.х.)
12211
Tension of the accumulator is lower 10B or higher than 16B
12212
Sensor switch of a closed position of a butterfly valve
12213
Sensor switch of completely open provision of a butterfly valve
12214
Malfunction of the sensor of temperature of a cooler
12221
Lack of a signal of the measuring instrument of mass of the soaked-up air
12222
Signal of the valve of management of idling
12223
Poor working mix, short circuit on the case in a chain a lambda probe
12224
Rich working mix, short circuit in a chain a lambda probe on 12 V
12225
Malfunction lambda probe or its heater
12231
Lack of a signal of ignition (normally if the engine is switched off)
12232
Control unit supply voltage on the plug No. 4 is less than 1B
12233
Malfunction of the control unit
12241
Malfunction of an injector
12242
The measuring instrument of mass of the soaked-up air
12248
Malfunction of cleaning of the sensor with a "heated" wire
12243
Lack of a signal of speed of the car
12244
Lack of a signal of "Drive" (automatic transmission)
12245
Malfunction of system of recirculation of the fulfilled gases
12251
Sensor of provision of a butterfly valve
12252
Valve of a purge of a coal adsorber
12253
Primary chain of ignition
12254
There is no signal of turns (the engine is switched off)
00000
Lack of malfunctions, all codes of malfunctions are taken from memory of the control unit

Bosch LH 2.4 system, list of codes of actuation mechanisms

Actuation mechanisms become more active in the specified sequence. Check of their working capacity is carried out on hearing (at their operation clicks are heard). Besides, it is possible to take the mechanism before check visually to be convinced of its working capacity.

The chain of the fuel pump is not highlighted

Code

Malfunction

12411
Injector chain
12412
Chain of the valve of management of idling
12413
Chain of the electromagnetic valve of a purge of an adsorber
12421
Signal of "Drive" of automatic transmission. The alarm bulb ceases to blink at the time of switching from situation "D" in situation "N"
12424
Sensor switch of a closed position of a butterfly valve. Slightly open a butterfly valve a little. The alarm bulb ceases to blink when moving the gate from a closed position
12431
Sensor switch of completely open provision of a butterfly valve. Completely open a butterfly valve. The alarm bulb ceases to blink when the gate holds completely open position

Bosch LH 2.4, 2.4.2 and Saab Direct Ignition systems

(reader code)

Constant code

Changeable code

Malfunction

11111
Lack of malfunctions
42241
22241
High voltage. The models produced after 1991
42251
22251
Weak signal on the control unit plug No. 4
42252
22252
Tension of a signal is less than 10B
42291
22291
Voltage of the accumulator is less than 10 V or more than 16B
42440
22440
Lambda probe or its chain. Rich working mix
42441
22441
Rich working mix idling. The models produced after 1991
42442
22442
Rich working mix at the movement. The models produced after 1991
42450
22450
Lambda probe or its chain, poor working mix
42451
22451
Poor working mix idling. The models produced after 1991
42452
22452
Poor working mix at the movement. The models produced after 1991
42460
22460
Lambda probe or its chain
42491
22491
Composition of working mix idling
42492
22492
Composition of working mix at the movement of the car
44221
24221
Lack of a signal of the sensor of speed of the car. The models produced after 1991
44261
24261
Sensor of speed of the car or its chain. The models produced after 1991
44360
24360
Sensor of provision of a bent shaft or its chain
44460
24460
Improbable signal of loading of the engine
44660
24660
Failure of an advancing of ignition (detonation)
44661
24461
Sensor of a detonation or its chain
44662
24462
Malfunction of synchronization in the cylinder
44671
24671
The signal of an advancing of ignition exceeds 20´
45641
25641
The measuring instrument of mass of the soaked-up air or its chain, high level of a signal
45651
25651
The measuring instrument of mass of the soaked-up air or its chain, low level of a signal
45691
25691
The measuring instrument of mass of the soaked-up air or its chain
45723
25723
Signal of "Drive" (automatic transmission)
45771
25771
Potentiometer of a butterfly valve or its chain
45772
25772
Potentiometer of a butterfly valve or its chain
46221
26221
Sensor of temperature of cooling liquid or its chain, low level of a signal
46271
26271
Sensor of temperature of cooling liquid or its chain, high level of a signal
46391
26391
System of recirculation of the fulfilled gases or its chain
58121
38121
The measuring instrument of mass of the soaked-up air or its chain
58321
38321
Valve of control of the conditioner or its chain
58322
38322
Valve of system of catching of vapors of fuel or its chain
58371
38371
Injector or its chain
58372
38372
Valve of system of catching of vapors of fuel or its chain
58382
38382
Valve of system of catching of vapors of fuel or its chain (short circuit). The models produced after 1991
60000
Internal testing
60001
Malfunction of memory of ROM of the control unit
60002
Malfunction of memory of the RAM of the control unit
67192
Memory of ROM of the ROM control unit

System of ignition

 

The blinking code

Green light-emitting diode

3 flashes
Control unit of ignition
4 flashes
Detonation sensor chain
5 flashes
Engine control unit signal

Red light-emitting diode

Burns constantly
The latest ignition (strong vibration)
Sometimes flashes under loading
Lack of malfunctions - the detonation takes place

Codes of security systems

Models since 1995 of release

Characteristic

Value

B000
Lack of malfunctions
B1227
Control lamp of security systems, short circuit on
B1228
Control lamp of security systems, short circuit on the case
B1232
The central precautionary lamp, short circuit on
B1233
The central precautionary lamp, short circuit on the case
B1331
Driver's safety cushion, short circuit on or the case
B1332
Driver's safety cushion, break or high resistance in a chain
B1333
Driver's safety cushion, low resistance in a chain
B1336
Passenger safety cushion, short circuit on or the case
B1337
Passenger safety cushion, break or high resistance in a chain
B1338
Passenger safety cushion, low resistance in a chain
B1605
Control unit of security systems
B1610
Programming error
B1615
The control unit of security systems - the ignition sensor chain is activated
B1620
Control unit of security systems
B2332
Driver's safety cushion, short circuit on the case

B2333
Driver's safety cushion, short circuit on
B2337
Passenger safety cushion, short circuit on the case
B2338
Passenger safety cushion, short circuit on
B2441
Pyrotechnic natyazhitel of a driver's seat belt, conducting break
B2442
Pyrotechnic natyazhitel of a driver's seat belt, short circuit on the case
B2443
Pyrotechnic natyazhitel of a driver's seat belt, short circuit on
B2444
Pyrotechnic natyazhitel of a driver's seat belt, the low resistance or short circuit in a chain
B2446
Pyrotechnic natyazhitel of a passenger seat belt, conducting break
B2447
Pyrotechnic natyazhitel of a passenger seat belt, short circuit on the case
B2448
Pyrotechnic natyazhitel of a passenger seat belt, short circuit on
B2449
Pyrotechnic natyazhitel of a passenger seat belt, the low resistance or short circuit in a chain
B2861
Side driver's safety cushion, short circuit on the case
B2862
Side driver's safety cushion, short circuit on
B2863
Side driver's safety cushion, conducting break
B2864
Side driver's safety cushion, short circuit in a chain
B2866
Side passenger safety cushion, short circuit on the case
B2867
Side passenger safety cushion, short circuit on
B2868
Side passenger safety cushion, conducting break
B2869
Side passenger safety cushion, short circuit in a chain
B2871
Sensor of blow of a side driver's safety cushion, conducting break
B2872
The sensor of blow of a side driver's safety cushion, short circuit on
B2873
The sensor of blow of a side driver's safety cushion, short circuit on the case
B2876
Sensor of blow of a side passenger safety cushion, conducting break
B2877
The sensor of blow of a side passenger safety cushion, short circuit on
B2878
The sensor of blow of a side passenger safety cushion, short circuit on the case
B2880
The passenger safety cushion worked
B2885
The driver's safety cushion worked
B2890
Pyrotechnic natyazhitel of seat belts worked
B2895
The side driver's safety cushion worked
B2900
The side passenger safety cushion worked

Models of 1992-1994 of release

Ustoych vy refusal

Temporarily arising refusal

42450
22450
Ignition block supply voltage - a safety lock or break in a chain
42482
22482
Control lamp of 2 security systems, short circuit on
43A21
23A21
Driver's safety cushion, break in a chain
43A22
23A22
Passenger safety cushion, break in a chain
43A24
23A24
Pyrotechnic natyazhitel of a driver's seat belt, conducting break
43A25
23A25
Pyrotechnic natyazhitel of a passenger seat belt, conducting break
43A31
23A31
Driver's safety cushion, short circuit in a chain
43A32
23A32
Passenger safety cushion, short circuit in a chain
45321
25321
The sensor of front blow at the left, break in a chain
45322
25322
The sensor of front blow on the right, break in a chain
45341
25341
The sensor of front blow at the left, high resistance in a chain to the case
45342
25342
The sensor of front blow on the right, high resistance in a chain to the case
47421
27421
Control lamp of 1 security systems, break in a chain
47471
27471
Control lamp of 1 security systems, short circuit on the case
47481
27481
Control lamp of 1 security systems, short circuit on
67570
77570
Ignition spirals, short circuit on the case
67580
77580
Ignition spirals, short circuit on
77590
Control unit of security systems
67590
Control unit of security systems
67592
The control unit of security systems, the ignition chain is activated
E2991
Programming error

Examples of oscillograms lambda probe

The oscillogram of an impulse of an injector in the first cylinder

Impulses of the sensor of a bent shaft

The injector copes a rectangular impulse. On earlier models it is possible to meet the impulse type consisting of two impulses - the first by full tension for opening of the valve of an injector, the second - lowered for keeping of the valve in open situation.



Old sensor of oxygen idling


In a figure corner showing composition of exhaust gases. At the same time NANOSECOND it is given in parts on one million. Other gases as a percentage. Here it is difficult to notice anomaly, however it is visible that from time to time tension falls below zero.



The same a lambda probe on the raised turns (2095 rpm) without loading.


New lambda probe idling


Big activity and lack of negative indications, and also some improvements WITH and NANOSECOND is visible. Besides, the old sensor demanded bigger warming up for entry of system into the mode of short circuit of a loop of feedback.

Other example

The catalytic converter does not work at all. Therefore here parameters of exhaust gases well characterize operation of the engine. It is visible that rather free oxygen which could oxidize WITH to lower level what was visible in the previous example. The car suffered from instability of idling, and from time to time, became deaf. When checking, it was not succeeded to reveal these symptoms, but replacement of the oxygen sensor corrected a situation. Quite often the sensor begins to work badly after good warming up at speed under loading.



Old sensor

New sensor


Big amplitude and speed of switchings from one situation in another is observed. Slowly reacting sensor the computer can mislead, and during its rise it can still time - two to add fuel that it can affect operation of the engine.

The oxygen sensor gives tension lower than 0.45B at poor mix, and above - at rich. It works in the key mode. The processor reacts to its indications that leads to fluctuations of tension. At poor mix he adds fuel, at rich - diminishes.

If the sensor constantly is near the average value 0.45, it means that it is faulty (this tension is given the processor on the high-resistance entrance). If its tension constantly is at limit, it can mean also that the system went beyond a possible limit of adjustment. For example, at an air suction bypassing the stream measuring instrument. Low value of an air stream can exhaust adjustment opportunities, and tension on the sensor will be on the lower limit.