Without Hard DTCs/Lamp Fault Codes

DIAGNOSING CUSTOMER CONCERNS WITHOUT HARD DIAGNOSTIC TROUBLE CODES (DTCs)

If a lamp fault code (LFC) is reported by the customer but is not present when the vehicle comes in for repair, follow the Diagnostic Instructions procedure to identify the intermittent DTC.

Once the DTC is known, read the Normal Operation note located at the start of each Pinpoint Test for the code involved.
- Follow the deactivation procedure.
- Determine the location of components involved in creating that code.
- Carry out a thorough visual inspection of:
- Components
- Connectors
- Splices and wiring harnesses
- Pinched wires
- Worn insulation on conductors
- Opens, shorts or loosely mounted air bag control module
- Opens, shorts or loosely mounted sensors

Refer to Possible Causes note located at the start of each Pinpoint Test, which lists the common concerns that relate to that particular code. Concerns are listed according to priority.