1. Start of verification
1. Check to see if there are any recent repair entries in the service log that could indicate a fault, and if any scheduled maintenance is due.
2. Open the hood and check the following:
- Are the electrical wiring connectors tightly connected?
- whether the electrical wiring is laid correctly, not pinched or cut;
- Are the vacuum hoses connected tightly, are they pinched, are there any cracks?
- are there any leaks from hoses and tubes;
- Is the air cleaner clogged?
- gaskets
3. Make sure that electrical consumers are turned off and there are no mechanical loads.
- headlights are off;
- the air conditioner is turned off;
- rear window defroster is off;
- the steering wheel is in a position corresponding to straight-line movement, etc.
4. Start the engine and warm it up until the engine coolant temperature gauge needle deviates to the middle of the scale.
- Make sure the engine speed is below 1000 rpm.
5. Run the engine at about 2000 rpm for about 2 minutes without load.
6. Using the CONSULT-III tester or GST scanner, verify that no DTCs are displayed on the display.
Is a DTC displayed?
Yes - Go to step 2.
No - Go to step 3.
2. Repair or replace
Repair or replace components according to the appropriate «Diagnostic procedure».
Go to step 3.
3. Check the specified idle speed.
1. Run the engine at about 2000 rpm for about 2 minutes without load.
2. Increase engine speed two or three times (from 2000 to 3000 rpm) without load, then run the engine at idle speed for about 1 minute.
3. Check idle speed. See below for the procedure.
Are the test results normal?
Yes - Go to step 10.
No - Go to step 4.
4. Carry out training in the released position of the accelerator pedal.
1. Stop the engine.
2. Carry out training in the released position of the accelerator pedal. See below.
Go to step 5.
5. Teach the throttle position closed.
See below.
Go to step 6.
6. Carry out training on air supply at speed x. X.
See below.
Training in air supply at idle speed. carried out successfully?
Yes - Go to step 7.
No - Follow the instructions in paragraph. «Training in air supply at idle speed.» below. Then go to step 4.
7. Check the specified idle speed again.
1. Start the engine and warm it up to normal operating temperature.
2. Check the speed x. X.
Are the test results normal?
Yes - Go to step 10.
No - Go to step 8.
8. Determine the faulty torque.
Check the following:
- Camshaft angle sensor, (PHASE) and chain.
- Crank angle sensor (POS) and purpose.
Are the test results normal?
Yes - Go to step 9.
No - Repair or replace. Then go to step 4.
9. Check ECM operation
1. To check the operation of the ECM, replace it with a known good one. block. (The ECM could be the cause of the problem although it is unlikely).
2. Initialize the NATS system and register the ID codes of all NATS ignition keys.
Go to step 4.
10. Check the ignition timing
1. Let the engine run at idle speed.
2. Check the ignition timing using a strobe light.
See below for the procedure.
Are the test results normal?
Yes - End of check.
No - Go to step 11.
11. Carry out training in the released position of the accelerator pedal.
1. Stop the engine.
2. Carry out training in the released position of the accelerator pedal. See below.
Go to step 12.
12. Teach the throttle position closed.
See below.
Go to step 13.
13. Carry out training on air supply at idle speed.
See below.
Training in air supply at idle speed. Was it done successfully?
Yes - Go to step 14.
No - Follow the instructions in paragraph. «Training in air supply at idle speed.» below. Then go to step 4.
14. Check the specified idle speed again.
1. Start the engine and warm it up to normal operating temperature.
2. Check the speed x. X. Execution procedure see below.
Are the test results normal?
Yes - Go to step 15.
No - Go to step 17.
15. Check the ignition timing again
1. Let the engine run at idle speed.
2. Check the ignition timing using a strobe light.
Execution procedure see below.
Are the test results normal?
Yes - End of check.
No - Go to step 16.
16. Check timing chain installation
Check the timing chain installation. See chapter «Mechanical part of the engine».
Are the test results normal?
Yes - Go to step 17.
No - Correct deficiencies in timing chain installation. Then go to step 4.
17. Determine the faulty moment.
Check the following:
- Camshaft Angle Sensor (PHASE) and chain.
- Crank angle sensor (POS) and chain.
Are the test results normal?
Yes - Go to step 18.
No - Repair or replace.
Then go to step 4.
18. Check ECM operation
1. To check ECM operation, replace it with a known-good unit. (The ECM may be the cause of the problem, although it is unlikely).
2. Initialize the NATS system and register the ID codes of all NATS ignition keys.
Go to step 4.