General Diagnosis

General Diagnosis

The following table provides quick links to all chapters in this section.

Preliminary Check

Before performing any pin point test or component diagnosis, a preliminary check must be performed.

Check the Technical Bulletins for information that may supersede any information included in this information..

- Connect the scan tool.

- Switch the ignition on.

- Using the scan tool, check for any stored or related DTCs.

If other DTCs are stored:

- Repair these DTCs first before performing the following procedure.

If no other DTCs are stored:

- Using the scan tool, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

- Perform a road test to attempt to duplicate the customers complaint.

If the DTC returns:

- Perform the diagnostic procedure.

If the DTC does not return:

- The fault is intermittent or a sporadic condition may exist.

- Check the suspected component, electrical harness and electrical harness connectors for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Perform a road test to verify the repair.

If the DTC returns:

- Perform the diagnostic procedure.

If the DTC does not return:

The fault may have been the result of a loose electrical connection.

- Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.