Diagnosing Customer Concerns w/out Hard Fault Codes

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 Diagnostic Trouble Code (DTC).Diagnostic Instructions

Once the DTC is known, read the Normal Operation section included in the Test Notes of the applicable Pinpoint Test.
- Determine the location of components involved in creating that code.
- Perform a thorough visual inspection of:
+ components.
+ connectors.
+ splices and wiring harnesses.
+ pinched wires.
+ worn insulation on conductors.
+ opens, shorts, or loosely mounted sensors.

Also check the Possible Causes shown in the Test Notes of the applicable Pinpoint Test, which list the common concerns that relate to a particular code. Concerns are listed according to priority.