Nissan Versa
Sedan Service Manual
Engine » Engine control system (EC)
Basic inspection

Work Procedure

1.INSPECTION START

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.

2. Open engine hood and check the following:

Harness connectors for improper connections
Wiring harness for improper connections, pinches and cut
Vacuum hoses for splits, kinks and improper connections
Hoses and ducts for leaks
Air cleaner clogging
Gasket

3. Confirm that electrical or mechanical loads are not applied.

Headlamp switch is OFF.
Air conditioner switch is OFF.
Rear window defogger switch is OFF.
Steering wheel is in the straightahead position, etc.

4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.

Ensure engine stays below 1,000 rpm.

INSPECTION START

5. Run engine at about 2,000 rpm for about 2 minutes under no load.

6. Make sure that no DTC is displayed with CONSULT or GST.

Is any DTC detected?

YES >> GO TO 2.

NO >> GO TO 3.

INSPECTION START

2.REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3

3.CHECK TARGET IDLE SPEED

1. Run engine at about 2,000 rpm for about 2 minutes under no load.

2. Rev engine (2,000 to 3,000 rpm) two or three times under no load, then run engine at idle speed for about 1 minute.

3. Check idle speed.

For procedure, refer to EC, "Inspection".

For specification, refer to EC, "Idle Speed".

Is the inspection result normal?

YES >> GO TO 10.

NO >> GO TO 4.

CHECK TARGET IDLE SPEED

4.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop engine.
Perform EC, "Work Procedure".

>> GO TO 5.

5.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform EC, "Work Procedure".

>> GO TO 6.

6.PERFORM IDLE AIR VOLUME LEARNING

Perform EC, "Work Procedure".

Is Idle Air Volume Learning carried out successfully?

YES >> GO TO 7.

NO >> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.

7.CHECK TARGET IDLE SPEED AGAIN

Start engine and warm it up to normal operating temperature.
Check idle speed.

For procedure, refer to EC, "Inspection".

For specification, refer to EC, "Idle Speed".

Is the inspection result normal?

YES >> GO TO 10.

NO >> GO TO 8.

8.DETECT MALFUNCTIONING PART

Check the Following.

Check intake camshaft position sensor (PHASE) and circuit.
Check crankshaft position sensor (POS) and circuit.

Is the inspection result normal?

YES >> GO TO 9.

NO >> Repair or replace. Then GO TO 4.

9.CHECK ECM FUNCTION

Substitute another knowngood ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
Perform initialization and registration of all NATS ignition key IDs.

>> GO TO 4.

10.CHECK IGNITION TIMING

Run engine at idle.
Check ignition timing with a timing light.

Timing indicator (1)

Is the inspection result normal?

YES >> GO TO 19.

NO >> GO TO 11.

CHECK IGNITION TIMING

11.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop engine.
Perform EC, "Work Procedure".

>> GO TO 12.

12.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform EC "Work Procedure".

>> GO TO 13.

13.PERFORM IDLE AIR VOLUME LEARNING

Perform EC, "Work Procedure".

Is idle air volume learning carried out successfully?

YES >> GO TO 14.

NO >> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.

14.CHECK TARGET IDLE SPEED AGAIN

Start engine and warm it up to normal operating temperature.
Check idle speed.

For procedure, refer to EC, "Inspection".

For specification, refer to EC, "Idle Speed".

Is the inspection result normal?

YES >> GO TO 15.

NO >> GO TO 17.

15.CHECK IGNITION TIMING AGAIN

Run engine at idle.
Check ignition timing with a timing light.

For procedure, refer to EC, "Inspection".

For specification, refer to EC, "Ignition Timing".

Timing indicator (1)

Is the inspection result normal?

YES >> GO TO 19.

NO >> GO TO 16.

CHECK IGNITION TIMING AGAIN

16.CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to EM, "Removal and Installation".

Is the inspection result normal?

YES >> GO TO 17.

NO >> Repair the timing chain installation. Then GO TO 4.

17.DETECT MALFUNCTIONING PART

Check the following.

Check intake camshaft position sensor (PHASE) and circuit. Refer to EC "DTC Logic".
Check crankshaft position sensor (POS) and circuit. Refer to EC "DTC Logic".

Is the inspection result normal?

YES >> GO TO 18.

NO >> Repair or replace. Then GO TO 4.

18.CHECK ECM FUNCTION

Substitute another knowngood ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
Perform initialization of NATS system and registration of all NATS ignition key IDs.

>> GO TO 4.

19.INSPECTION END

If ECM is replaced during this BASIC INSPECTION procedure, perform EC, "Work Procedure".

>> INSPECTION END

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