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 article.

• 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: Reset/delete diagnostic data .
• 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 Description .

End of diagnosis