Adjustment conditions
1. The engine must be warmed up to operating temperature.
2. All electrical components must be turned off, the radiator cooling fan must not run during the adjustment.
3. The exhaust system must be in good condition.
4. The ignition timing must be set correctly.
5. Where used, the Lambda control must work correctly.
6. On models with automatic transmission, the kickdown function should work correctly.
7. If the injector pipes are disconnected, the engine must be accelerated to 3000 rpm and back to idle several times at least two minutes before making changes.
8. Air conditioning system (where used) must be turned off.
9. Where used, remove the plug from the carbon filter adjustment screw.
10. Throttle should be in the idle position.
DX engine
11. Install the clamp to the idle speed unit hose (fig 3.19).
12. Disconnect the crankcase ventilation hose from the valve cover and expose it to fresh air.
13. With the ignition off, connect a tachometer and an exhaust gas analyzer to the engine.
14. Start the engine, then check that the idle speed and CO content are within the specifications. If necessary, adjust the screws shown in fig. 3.20, using a special key to adjust the CO content. When adjusting CO, do not press the key or rotate the engine with the adjusting key installed.
15. Guided Chapter 16, paragraph 7, connect the crankcase ventilation hose.
RM engine
16. With the ignition off, connect a tachometer and an exhaust gas analyzer to the engine.
17. No adjustment possible. If the parameters are incorrect, check all vacuum connections and the gray frequency valve coil. If necessary, display the fault memory.
PS engines (since 1989) and JN
18. See steps 11-15, but connect an exhaust gas analyzer with a measuring pipe before the exhaust manifold.
NG engine
19. With the ignition off, connect the tachometer to the engine and the measuring tube of the CO exhaust gas analyzer.
20. Install the clip on the crankcase ventilation hose (pic. 3.21). Remove the dipstick and cover the tube with a cloth.
21. Start the engine, then check that the idle speed and CO content are as in Specifications.
22. Note that the idle speed cannot be adjusted and the screw in the throttle body must be fully screwed in.
23. Check the ignition timing as described in Section 4.
24. Disconnect the electrical wiring from the Lambda sensor, then check the CO content. If necessary, using a special key, adjust the ignition timing (pic. 3.22).
25. Connect the electrical wiring to the Lambda sensor and check the CO content.
26. Disconnect the carbon filter line, the CO content should drop. Now pinch the line, the CO content should rise and immediately fall. If not, check the lambda sensor.
PS engine (before 1989) and KV
27. With the ignition off, connect the tachometer and exhaust gas analyzer to the engine. Also connect a multimeter to the idle speed stabilization unit (photo), guided by Fig. 3.23 and 3.24.
28. On the KV engine, disconnect and plug the crankcase ventilation hose.
29. On the PS engine, install the clamp on the crankcase ventilation hose, then remove the level measurement probe and cover the tube with a rag.
30. Start the engine and set the idle speed.
31. Check that the current in the control circuit and the content of CO correspond to the data in the Specifications. If necessary, adjust the screws shown in Fig. 3.26 and 3.27 (photo). If the current in the control circuit remains constant, approximately 470 mA, check the stabilization of the idle frequency.
32 See paragraphs 14 and 15.
Engine FOR
33. Check the ignition timing as described in Section 4.
34. With the ignition off, connect the tachometer to the engine. Also connect an exhaust gas analyzer to the measuring tube on the exhaust manifold.
35. Start the engine and set the idle speed Check the idle speed as given in Specifications.
36. On models with air conditioning, the idle speed should increase by approximately 70 rpm when the air conditioning is on.
37. Check CO content as determined specification. If adjustment is necessary, remove the carbon filter cover and disconnect the crankcase ventilation hose from the valve cover.
38. With the ignition off, disconnect the wiring from the differential pressure regulator and connect a multimeter using an adapter. Turn on the ignition and check that the current in the control circuit is positive. If not, replace wiring.
39. Start the engine and set the idle speed.
40. Adjust the CO screw using the special key until the current in the control circuit is between 0 and 5 mA. When adjusting CO, do not press the key or rotate the engine with the adjusting key installed. After removing the key, accelerate the engine before checking the CO content.
41. If necessary, clear the damage memory.
Engine 7A
42. With the ignition off, connect the tachometer and exhaust gas analyzer to the engine.
43. Install the clamp to the crankcase ventilation hose located behind the fuel pressure regulator. Remove the dipstick and cover the tube with a rag.
44. Start the engine and set the idle speed.
45. Remove the cover from the fuse box and connect the fuse across the contacts of the fuel pump relay. Wait approximately three seconds, then check that the idle speed is within the specifications. If necessary, adjust the idle speed screw shown in fig. 3.28.
46. Check the CO content as given in Specifications and adjust with a screw if necessary.
47. After installing CO, adjust the idle speed.
48. Remove the fuse from the fuel pump relay and bring the engine speed to 2000 rpm. If the idle speed and CO data are now different from Specifications, determine the faulty component by the vehicle's self-diagnosis system.
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