Diagnostic Test

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. Perform INSPECTION MODE 1. Refer to DESCRIPTION .
5. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.

   Ensure engine stays below 1, 000 RPM.

6. Run engine at about 2, 000 RPM for about 2 minutes under no load.

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

Are any DTCs detected?

YES 

GO TO STEP 2  .

NO 

GO TO STEP 3  .

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

GO TO STEP 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. Refer to INSPECTION .

Is the inspection result normal?

YES 

GO TO STEP 10  .

NO 

GO TO STEP 4  .

Perform throttle valve closed position learning. Refer to DESCRIPTION .

GO TO STEP 5  .

Perform idle air volume learning. Refer to DESCRIPTION .

Is Idle Air Volume Learning carried out successfully?

YES 

GO TO STEP 6  .

NO 

1. Follow the instruction of Idle Air Volume Learning.
2. GO TO STEP 4  .

1. Perform INSPECTION MODE 1. Refer to DESCRIPTION .
2. Start engine and warm it up to normal operating temperature.
3. Check idle speed. Refer to INSPECTION .

Is the inspection result normal?

YES 

GO TO STEP 9  .

NO 

GO TO STEP 7  .

Check the Following.

• Check camshaft position sensor and circuit. Refer to COMPONENT INSPECTION (CAMSHAFT POSITION SENSOR) .
• Check crankshaft position sensor and circuit. Refer to COMPONENT INSPECTION (CRANKSHAFT POSITION SENSOR) .

Is the inspection result normal?

YES 

GO TO STEP 8  .

NO 

1. Repair or replace.
2. GO TO STEP 4  .

1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to SYSTEM DESCRIPTION .

GO TO STEP 4  .

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

Is the inspection result normal?

YES 

GO TO STEP 18  .

NO 

GO TO STEP 10  .

1. Stop engine.
2. Perform accelerator pedal released position learning. Refer to DESCRIPTION .

GO TO STEP 11  .

Perform throttle valve closed position learning. Refer to DESCRIPTION .

GO TO STEP 12  .

Perform idle air volume learning. Refer to DESCRIPTION .

Is Idle Air Volume Learning carried out successfully?

YES 

GO TO STEP 13  .

NO 

1. Follow the instruction of Idle Air Volume Learning.
2. GO TO STEP   4  .

1. Turn ignition switch ON.
2. Perform INSPECTION MODE 1. Refer to DESCRIPTION .
3. Start engine and warm it up to normal operating temperature.
4. Check idle speed. Refer to INSPECTION .

Is the inspection result normal?

YES 

GO TO STEP 14  .

NO 

GO TO STEP 16  .

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

Is the inspection result normal?

YES 

GO TO STEP 18  .

NO 

GO TO STEP 15  .

Check timing chain installation. Refer to REMOVAL AND INSTALLATION .

Is the inspection result normal?

YES 

GO TO STEP 16  .

NO 

1. Repair the timing chain installation.
2. GO TO STEP   4  .

Check the following.

• Check camshaft position sensor and circuit. Refer to COMPONENT INSPECTION (CAMSHAFT POSITION SENSOR) .
• Check crankshaft position sensor and circuit. Refer to COMPONENT INSPECTION (CRANKSHAFT POSITION SENSOR) .

Is the inspection result normal?

YES 

GO TO STEP 17  .

NO 

1. Repair or replace.
2. GO TO STEP   4  .

Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)

GO TO STEP  4  .

If ECM is replaced during this BASIC INSPECTION procedure, go to DESCRIPTION .

INSPECTION END