Inspection Procedures

1. Connect Hi-Scan (Pro) to data link connector.
2. Turn ignition switch to ON and monitor other DTCs.

Are any other DTCs also set? 

No: Go to next step.

Yes: Do all repairs associated with those codes before proceeding with this procedure.

1. Thoroughly check connectors for loose, poor connection, bent, corrosion, contamination, deterioration, or damage.

Are all connectors good? 

Yes: Go to next

No: Repair or replace it.

1. Visually check intake and exhaust systems for leakage.

Is any leakage present? 

Yes: Go to next

No: Repair it.

1. Start engine and check engine RPM decrease when disconnecting each injector connector in sequence.

Is there any cylinder with no change in RPM or only a small change in RPM? 

Yes: Go to next

No: Repair or replace it.

1. Start engine with the fuel pump disconnected and wait until stopping by itself to release fuel pressure.
2. Attach fuel pressure gauge to fuel delivery pipe.
3. Start engine and check fuel pressure at idle.

Is there any cylinder with no change in RPM or only a small change in RPM? 

Yes: Go to next

No: Check fuel delivery system. See FUEL DELIVERY SYSTEM  .

1. Reconnect HO2S and ECM connectors.
2. Warm up engine to normal operating temperature.
3. Using Hi-Scan (Pro), monitor HO2S signal waveform.

Do the front HO2S signals fluctuate between 0V and 1V? 

Yes: Proceed with ECM PROBLEM PROCEDURE  .

No: Replace HO2S.