Table of contents: 1. Start of the check ↓ 2. Repair or replace ↓ 3. Check the specified idle speed. ↓ 4. Conduct accelerator pedal release…↓ 5. Conduct closed throttle position…↓ 6. Check the specified idle speed…↓ 7. Identify the faulty component ↓ 8. Check the operation of the ECM…↓ 9. Check the ignition timing ↓ 10. Conduct accelerator pedal…↓ 11. Conduct closed throttle position…↓ 12. Check the specified idle speed…↓ 13. Check the ignition timing again ↓ 14. Check the timing chain…↓ 15. Identify the faulty component ↓ 16. Check the operation of the ECM…↓ 17. End of verification ↓ If you replace the ECM, perform the…↓
1. Start of the check
1. Check whether there are any entries in the service log for recently performed repairs that could indicate the corresponding malfunction, and whether the scheduled maintenance is due.
2. Open the hood and check the following:
- are the electrical wiring connectors tightly connected?;
- is the electrical wiring laid correctly, not pinched or cut?;
- are the vacuum hoses tightly connected, are they pinched, are there any cracks?;
- are there any leaks from the hoses and tubes;
- is the air purifier clogged?;
- gaskets.
3. Make sure that electrical consumers are switched off and there are no mechanical loads:
- headlights off;
- the air conditioner is off;
- rear window defroster 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 moves to the middle of the scale.
- Make sure the engine speed is below 1000 rpm.
5. Let the engine run at about 2000 rpm for about 2 minutes without load.
6. Using the CONSULT-III tester or GST scanner, make sure that no DTC codes are displayed on the display.
Is a DTC code displayed?
Yes - Proceed 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. Let the engine run at about 2000 rpm for about 2 minutes without load.
2. Increase the engine speed two or three times (from 2000 to 3000 rpm) without load, then let the engine run at idle speed for about 1 minute.
3. Check the idle speed. See the procedure below. Are the test results normal?
Yes - Proceed to step 9.
No - Proceed to step 4.
4. Conduct accelerator pedal release position training
1. Turn off the engine.
2. Conduct training in the released position of the accelerator pedal. See below.
Proceed to point 5.
5. Conduct closed throttle position training.
See below. Proceed to point 6.
6. Check the specified idle speed again.
1. Start the engine and warm it up to normal operating temperature.
2. Check the idle speed. See the procedure below. Are the test results normal?
Yes - Proceed to step 9.
No - Go to step 7.
7. Identify the faulty component
Check the following:
- Camshaft Position Angle Sensor (PHASE) and Circuit.
- Crankshaft Position Sensor (POS) and circuit.
Are the test results normal?
Yes - Proceed to step 8.
No - Repair or replace. Then go to step 4.
8. Check the operation of the ECM unit
1. To check the operation of the ECM, replace it with a known good unit. (The ECM may be the cause of the problem, although this is unlikely).
2. Initialize the NATS system and register the identification codes of all NATS ignition keys.
Proceed to point 4.
9. Check the ignition timing
1. Let the engine run at idle speed.
2. Check the ignition timing angle using a stroboscope.
Procedure of execution see below.
Are the test results normal?
Yes - Proceed to step 17.
No - Go to step 10.
10. Conduct accelerator pedal release position training
1. Turn off the engine.
2. Conduct training in the released position of the accelerator pedal. See below.
Proceed to point 11.
11. Conduct closed throttle position training
See below.
Proceed to point 12.
12. Check the specified idle speed again.
1. Start the engine and warm it up to normal operating temperature.
2 Check the idle speed.
Procedure of execution see below.
Are the test results normal?
Yes - Proceed to step 13.
No - Go to step 15.
13. Check the ignition timing again
1. Let the engine run at idle speed.
2. Check the ignition timing angle using a stroboscope.
Procedure of execution see below.
(The article was obtained from the portal: «Nissanbook.ru»)
Are the test results normal?
Yes - Proceed to step 17.
No - Go to step 14.
14. Check the timing chain installation
Check the timing chain installation. See chapter "Mechanical part of the engine".
Are the test results normal?
Yes - Proceed to step 15.
No - Correct the timing chain installation faults. Then proceed to step 4.
15. Identify the faulty component
Check the following:
- Camshaft Position Angle Sensor (PHASE) and Circuit.
- Crankshaft Position Sensor (POS) and circuit.
Are the test results normal?
Yes - Proceed to step 16.
No - Repair or replace. Then go to step 4
16. Check the operation of the ECM unit
1. To check the operation of the ECM, replace it with a known good unit. (The ECM may be the cause of the problem, although this is unlikely).
2. Initialize the NATS system and register the identification codes of all NATS ignition keys.
Proceed to point 4.
17. End of verification
If the ECM is replaced during the "Basic Checks" procedure, see additional information below.
If you replace the ECM, perform the following operations:
1. Initialize the NATS system and register the identification codes of all NATS ignition keys.
Proceed to point 2.
2. Conduct training in the released position of the accelerator pedal.
See below.
Proceed to point 3.
3. Conduct closed throttle position training.
See below.
End