7.2. Testing and replacement of components of control systems of toxicity of exhaust gases

Control of ventilation of a case

Components of this system do not require special attention, except check through regular intervals a condition of a hose (hoses) on pollution and damages.

System of recirculation of the fulfilled gases (EGR)

Testing

At emergence of malfunction of system of recirculation of the fulfilled gases (EGR) the code of malfunction registers in the electronic actuation device (ECU) LH-Jetronic, and on an instrument guard the alarm lamp lights up. Check reliability of fastening of all wires and hose connections of system of recirculation of the fulfilled gases (EGR). If it does not help to correct malfunction, address for council in representative office of SAAB.

Removal and installation into place

Air temperature sensor

For removal of the sensor of temperature of the soaked-up air disconnect a wire and unscrew the sensor from the inlet pipeline. Installation is made as it should be, the return to a removal order.

Vacuum receiver

The vacuum receiver is located in the left forward part of a motive compartment. At first remove the measuring instrument of an air stream (The head Toplivnaya and exhaust systems).

Disconnect vacuum hoses and remove a vacuum receiver together with a basic bracket.

Remove a basic bracket and establish it on a new vacuum receiver.

Installation in an order, the return to a removal order.

Distributive valve

The distributive valve is located in the line between a vacuum tank and the valve of recirculation of the fulfilled gases (EGR).

Disconnect a wire and hoses, having remembered a way of their arrangement and remove the valve.

Installation is made as it should be, the return to a removal order.

Lambda probe

Testing

The lambda probe can be checked by means of a tester which can be connected to a wire, as in the right end of the inlet pipeline (model with the LH-Jetronic system), or in the right part of a partition (Trionic system model).

Connect an ohmmeter between the 1 and 2 plug of the electric socket of the sensor. Do not connect an ohmmeter to wires of the electronic actuation device (ECU). The size of resistance has to be between 2.9 and 4.0 Ohms for the 12th watt a lambda probe (unleaded gasoline) or about 2.1 Ohms for the 18th watt a lambda probe (ethylated gasoline and a turbo a class 1). Value of resistance changes with a temperature and can reach 10 Ohms.

After conducting testing connect a wire into place.

Removal

The lambda probe is the difficult device and can be easily put out of action at blows, falling, interruption in supply of food or when using on it the cleaning materials. Replacement a lambda probe has to be made each 90 000 km.

Early models

Disconnect the electric socket in the right part of the inlet pipeline.

Release from a clip on a head of cylinders a wire and stretch it through a forward part of the engine.

Late models

 PERFORMANCE ORDER

1. Remove a sealing strip and a cover of a difficult partition in a back part of a motive compartment. Lift the right part of a cover and disconnect the electric socket a lambda probe.
2. Give screws from a partition plate, then delay a wire a lambda probe in a forward part of a motive compartment, if necessary having lifted a tube of the air conditioner.
3. Where it is necessary, release a wire from a clip on a tube of a cooler and give bolts of the holder of wires.
4. Where it is necessary, weaken a clip near the lower fixing bolt of the compressor of the air conditioning system.

All models

Unscrew the sensor from a reception pipe of the exhaust system and remove it. The sensor can be hardly tightened, in this case for its vyvinchivaniye it is useful in the beginning to try to rotate it forward back in a carving. Pay attention that for a vyvinchivaniye and screwing up of the sensor, the special cap head with cuts which is put on the sensor in such a way that does not allow damage of wires can be applied.

Installation into place

Installation is into place made as it should be, the return to a removal order. Before installing into place the sensor, apply on its carving of a little high-temperature lubricant. Tighten the sensor with the required effort. The wire has to be laid correctly and not concern the exhaust system.

Damper throttle gates

Testing

 PERFORMANCE ORDER

1. Warm up the engine up to the normal working temperature and check contents WITH and idling turns (where it is required).
2. Disconnect both a zakuporta a vacuum hose of the distributor and a hose of recirculation of the fulfilled gases (where it is established).
3. Start the engine and lift its turns to 2500 - 2700 rpm. Holding the engine on these turns, make sure that the damper plunger only touches a persistent finger of a throttle. If is not present, weaken a lock-nut and make adjustment of provision of a damper. After carrying out adjustment tighten a lock-nut.
4. Increase engine turns to 3000 rpm, then by means of a stop watch make sure that decrease in turns of the engine at a throttle otpuskaniye to turns of idling happens within 3 - 5 seconds.
5. In need of carrying out adjustment reduction of time can be made by a damper vyvinchivaniye from the throttle gate, and lengthening of an interval of time by a damper vvinchivaniye in the throttle gate.

Removal

Give a lock-nut and remove a damper from a bracket on the throttle case.

Installation into place

Installation is into place made as it should be, the return to a removal order. Make adjustment according to the instructions provided in §§22-26.

Adsorber and valve of a purge

Testing

If there were suspicions on malfunction of system, first of all carry out the procedures described in §§30-32. By means of a purge make sure that the hoses going from a coal adsorber and the valve of a purge are pure. At emergence of suspicion on malfunction of a coal adsorber or the valve of a purge, they have to be replaced.

Removal

 PERFORMANCE ORDER

1. Cock the emergency brake, then a front of the car and establish to a poddomkratta it on axial support (address Poddomkrachivaniye's Section, towage and change of wheels). Remove the right forward wheel.
2. Remove a plastic molding of the right forward wing, and then forward section of a loker of an arch of a wheel.
3. Mark the provision of hoses on an adsorber, then disconnect them.
4. Disconnect an adsorber from an adjusting bracket and take out it from under a wing.
5. Disconnect and remove the purge valve, pay attention that the arrow indicates the connecting end of an adsorber.

Installation into place

Installation is into place carried out as it should be, the return to a removal order. You watch that hoses joined in their initial situation, and the arrow of the valve of a purge specified in the right direction.

Catalytic converter

Testing

Quality of operation of the catalytic converter can be checked only by means of definition of composition of exhaust gases with use of carefully calibrated analyzer of exhaust gases of high quality (see the Head Routine maintenance).

In case of the SO high level in exhaust gases the car has to be driven away in representative office of SAAB for careful check with use of the special equipment of systems of ignition and injection of fuel, including a lambda probe. In case check showed full serviceability of the listed above systems, malfunction has to be in the most catalytic converter which has to be replaced.

On some models the catalytic converter turns on also temperature sensor signaling on an instrument guard by means of an alarm lamp.

Removal and installation into place

Removal and installation to the place of the catalytic converter are described in the Head Toplivnaya and exhaust systems as a part of procedures of removal and installation to the place of components of the exhaust system.

Sensor of temperature of the catalytic converter

Removal

 PERFORMANCE ORDER

1. For removal of the sensor of temperature at first completely shift the right front seat forward and disconnect the electric socket of the sensor.
2. For installation simplification into place tie up a wire a piece of a string.
3. Cock the emergency brake, then the car and establish to a poddomkratta it on axial support (address Poddomkrachivaniye's Section, towage and change of wheels).
4. Otboltite also remove the thermal screen which is under the catalytic converter.
5. Unscrew the sensor from the catalytic converter, then stretch a wire through a floor and untie a string. Leave a string on the place for simplification of dragging of a wire through a floor at installation it into place.

Installation into place

Installation is into place made as it should be, the return to a removal order. For drawing of a wire through a floor use a string.