Work Procedure

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:

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   • 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 straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.

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   Ensure engine stays below 1, 000 rpm.

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

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

Is any DTC detected?

YES

GO TO 2 .

NO

GO TO 3 .

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

GO TO 3

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.

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3. Check idle speed.

   For procedure, refer to Inspection .

   For specification, refer to Idle Speed .

Is the inspection result normal?

YES

GO TO 10 .

NO

GO TO 4 .

1. Stop engine.
2. Perform Description .

GO TO 5 .

Perform Description .

GO TO 6 .

Perform Description .

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 .

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

   For procedure, refer to Inspection .

   For specification, refer to Idle Speed .

Is the inspection result normal?

YES

GO TO 10 .

NO

GO TO 8 .

Check the Following.

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

Is the inspection result normal?

YES

GO TO 9 .

NO

Repair or replace. Then GO TO 4 .

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization and registration of all NATS ignition key IDs. Refer to Description (with intelligent key) or Description (without intelligent key).

GO TO 4 .

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

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   For procedure, refer to Inspection .

   For specification, refer to Ignition Timing .

   • Timing indicator (1)

Is the inspection result normal?

YES

GO TO 19 .

NO

GO TO 11 .

1. Stop engine.
2. Perform Description .

GO TO 12 .

Perform Description .

GO TO 13 .

Perform Description .

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 .

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

   For procedure, refer to Inspection .

   For specification, refer to Idle Speed .

Is the inspection result normal?

YES

GO TO 15 .

NO

GO TO 17 .

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

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   For procedure, refer to Inspection .

   For specification, refer to Ignition Timing .

   • Timing indicator (1)

Is the inspection result normal?

YES

GO TO 19 .

NO

GO TO 16 .

Check timing chain installation. Refer to Removal and Installation .

Is the inspection result normal?

YES

GO TO 17 .

NO

Repair the timing chain installation. Then GO TO 4 .

Check the following.

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

Is the inspection result normal?

YES

GO TO 18 .

NO

Repair or replace. Then GO TO 4 .

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare case.)
2. Perform initialization of NATS system and registration of all NATS ignition key IDs. Refer to Description (with intelligent key). Description (without intelligent key).

GO TO 4 .

If ECM is replaced during this BASIC INSPECTION procedure, perform Description .

INSPECTION END