Diagnosing Customer Concerns w/out Hard Fault Codes
Diagnosing Customer Concerns Without Hard Diagnostic Trouble CodesIf a diagnostic trouble code is reported by the customer but is not present when the vehicle comes in for service, follow the Diagnostic Trouble Code Retrieval procedure to identify the intermittent DTC.
Once the diagnostic trouble code is known, read "Normal Operation" for the code involved.
- Study the circuit diagram and determine the location of components involved in creating that code.
- Do a thorough visual inspection of components, connectors, splices and wiring harnesses, looking for pinched wires, worn insulation on conductors, opens, shorts, or loosely mounted sensors.
"Possible Causes" lists the common concerns that relate to that particular code. Each concern is listed in the order in which it is most likely to occur.