PR25DD engine

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 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 IDLE SPEED : Periodic Maintenance .

   For specification, Refer to IDLE SPEED : Service Data .

Is the inspection result normal?

YES

GO TO 10.

NO

GO TO 4.

1. Stop engine.
2. Refer to Work Procedure .

GO TO 5.

Refer to Work Procedure .

GO TO 6.

Refer to 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.

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

   For procedure, Refer to IDLE SPEED : Periodic Maintenance .

   For specification, Refer to IDLE SPEED : Service Data .

Is the inspection result normal?

YES

GO TO 10.

NO

GO TO 8.

Check the Following.

• Check camshaft position sensor and circuit. Refer to DTC Description .
• Check crankshaft position sensor and circuit. Refer to DTC Description .

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 of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to Work Procedure .

GO TO 4.

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

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   For procedure, Refer to IGNITION TIMING : Periodic Maintenance .

   For specification, Refer to IGNITION TIMING : Service Data .

   Timing indicator

Is the inspection result normal?

YES

INSPECTION END.

NO

GO TO 11.

1. Stop engine.
2. Refer to Work Procedure .

GO TO 12.

Refer to Work Procedure .

GO TO 13.

Refer to 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.

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

   For procedure, Refer to IDLE SPEED : Periodic Maintenance .

   For specification, Refer to IDLE SPEED : Service Data .

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 IGNITION TIMING : Periodic Maintenance .

   For specification, Refer to IGNITION TIMING : Service Data .

   Timing indicator

Is the inspection result normal?

YES

INSPECTION END.

NO

GO TO 16.

Check timing chain installation. Refer to TIMING CHAIN : Removal & 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 and circuit. Refer to DTC Description .
• Check crankshaft position sensor and circuit. Refer to DTC Description .

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 NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to Work Procedure .

GO TO 4.