Crankcase ventilation control
1. The components of this system do not require special attention, except for periodic inspection of the condition of the hoses.
Charcoal filter replacement
2. The carbon filter is located at the rear under the bottom of the car. To access the filter, lift the rear of the vehicle and place it on jack stands.
3. Remove the screws, remove the retainer and remove the plastic panel (if she is) on the right side of the spare wheel well (pic. 2.3).
4. Disconnect the hoses from the carbon filter. If the hoses have plastic connections, squeeze the retainer ring and pull off the hose. Label hoses to avoid confusion during reassembly (pic. 2.4).
5. Turn out screws and remove the coal filter with an arm.
6. Installation is carried out in the reverse order Be careful not to mix up the hoses Check the tightness of the hoses.
Purge valve replacement
M43TU engine
7. The valve is located on a bracket next to the air cleaner.
8. Turn off the ignition.
9. Disconnect the hose from the carbon filter (pic. 2.9).
10. Disconnect the electrical connector from the valve.
11. Turn the valve 90°counterclockwise and simultaneously pull it up to disconnect the remaining hoses.
12. Remove valve from support (pic. 2.12).
13. Install the valve in the reverse order of removal. Be careful not to mix up the hoses.
N42 engine
14. The valve is located under the intake manifold. For better access, remove the air duct of the ventilation and interior heating system at the rear of the engine compartment as follows.
- A) Remove the cabin air filter cover by turning its clips 90' counterclockwise. Pull the filter out of the housing.
- b) Unfasten the 4 latches of the wiring box and remove the sleeves with wires from the box (pic. 9.14,a).
- V) Remove the four screws and pull the cabin filter housing forward.
- G) Remove the two screws and remove the air duct (pic. 2.14.b).
15. In the left rear corner of the engine compartment, pull off the seal, turn the two latches counterclockwise and remove the trim panel (pic. 2.15). Remove the hoses and wires from the panel along with the sealing bushings.
16. Disconnect the hose from the underside of the intake manifold.
17. Disconnect the electrical plug from the valve, pull the valve out of the holder and disconnect the remaining hose (pic. 2.17).
18. Install the valve in reverse order.
M52TU and M54 engines
19. The valve is located under the intake manifold. Follow the steps in paragraph 14.
20. Disconnect the plug from the valve under the manifold (pic. 2.20).
21. Disconnect the hose from the underside of the valve by pressing the latch.
22. Disconnect the remaining hose and pull the valve out of the rubber collar.
23. Install the valve in reverse order.
Replacing the catalytic converter
M43TU and N42 engines
24. The catalytic converter is integral with the exhaust pipe. The catalytic converter can only be replaced as an assembly with the downpipe.
M52TU and M54 engines
25. The catalytic converter is integral with the exhaust manifolds. Replace the converter can only be assembled with collectors.
Replacing oxygen sensors
Comment. The exhaust system must be completely cool before removing the oxygen sensor.
26. Sensor (And) oxygen screwed (s) to the following places.
- A) On models with the M43TU engine - in front of and behind the catalytic converter.
- b) On models with the N48 engine, before and after the catalytic converter.
- V) On models with M58TU and M54 engines, before and behind the catalytic converters.
27. Turn off the ignition.
28. Apply the parking brake, raise the front of the car and place it on secure supports. Remove the crankcase protection from under the engine.
M43TU and N42 engines
29. Trace the wiring from the sensor to the connector under the vehicle and disconnect the connector (pic. 2.29).
M52TU and M54 engines
Note. Due to difficult access, to remove the sensor for cylinders 4 to 6, you will have to dismantle the entire exhaust system.
30. For better access, remove the air duct of the ventilation and interior heating system in the rear of the engine compartment as follows.
- A) Remove the cabin air filter cover by turning its retainers 90°counterclockwise. Pull the filter out of the housing.
- b) Unfasten the four latches of the wiring box and remove the sleeves with wires from the box (see fig. 8.14.a).
- V) Remove the four screws and pull the cabin filter housing forward.
- G) In the left rear corner of the engine compartment, pull off the seal, turn the two latches counterclockwise and slide the trim panel slightly forward.
- d) Remove the two screws and remove the air duct (see fig. 8.14b).
31. Remove the plastic cover over the injectors by removing the two plugs and unscrew the screws under them.
32. Release the wiring of the sensors from the mounts and disconnect their connectors. Label connectors for ease of installation (pic. 2.32).
33. Remove exhaust manifolds as directed in chapter 4A.
All models
34. Remove the oxygen sensor from the exhaust pipe.
35. Installation of the sensor is carried out in the reverse order, taking into account the following remarks.
- A) Tighten the sensor to the required torque.
- b) Make sure that the wires do not touch the exhaust system.
- V) Follow that. so that dirt or grease does not get on the tip of the sensor.
- G) Apply a small amount of copper-based lubricant to the threads of the sensor before screwing it into the exhaust pipe.
Secondary air injection system
Engine control valve M43TU
36. The control valve is located in the secondary air tube on the front side of the cylinder head. Disconnect the vacuum hose from the valve.
37. Squeeze the retaining ring and disconnect the air pump hose from the valve. Disconnect the outlet hose from the valve. Mark hoses before removal (pic. 2.37)
38. Turn out three bolts of fastening of an arm of the valve and remove the valve together with an arm from a head of cylinders.
39. Install the valve in reverse order.
M43TU engine diverter valve
40. The diverting valve is located in front of the cylinder head. Disconnect the electrical plug from the valve.
41. Remove the valve from the support bracket and disconnect the vacuum hoses from it. Note the position of the hoses (pic. 2.41).
42. Install the valve in reverse order.
M43TU engine air pump
43. Disconnect the electrical connector under the pump.
44. Disconnect the outlet hose from the pump by squeezing the retaining ring. The inlet hose must simply be pulled off the nozzle. Note the position of the hoses so as not to mix them up during installation (pic. 2.44).
45. Turn out three bolts of fastening of the pump to a basic arm and remove the pump.
46. Installation is carried out in reverse order.
Engine pressure valve N42
47. The pressure valve is located above the exhaust manifold on the right side of the cylinder head. Squeeze the retaining ring of the pump hose connection to the valve and disconnect the hose from the valve.
48. Turn off two nuts of fastening of the valve and remove it from a head of cylinders (pic. 2.48).
49. Install the valve in reverse order. Tighten the valve nuts securely.
N42 engine air pump
50. The air pump is located on the bracket. bolted to the right mudguard of the engine compartment. Squeeze the retaining ring of the pump hose connection to the valve and disconnect the hose from the pump (pic. 2.50).
51. Cut the clamp that secures the pump inlet hose to the top of the pump and remove the hose.
52. Turn out two bolts of fastening of an arm of the pump to an arm of a mudguard and remove the pump. Disconnect the electrical connector from the pump.
53. Installation of the pump is carried out in the reverse order of removal. Tighten the bracket mounting bolts securely.
Engine pressure valve M52TU
54. Follow the steps indicated in p.p. 47-49.
M52TU engine air pump
55. The air pump is located on the right mudguard in the engine compartment. Disconnect the hose from the pump.
56. Turn out two bolts and remove the pump (pic. 2.56). Disconnect the electrical connector from the pump.