Diagnostic Procedure
- Refer to any Technical Service Bulletins (TSBs) that may apply.
Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC set.
With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wire harness. Look for parameter values to change and/or a DTC to set.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
Inspect and clean all PCM, engine, and chassis grounds that related to the DTC set. If numerous trouble codes were set, use a wire schematic to help you find any common ground or supply circuits
For any Relay DTCs, actuate the Relay with the DRBIII® and wiggle the related wire harness to try to interrupt the actuation.
For intermittent Evaporative Emission trouble codes perform a visual and physical inspection of the related parts including hoses and the Fuel Filler cap.
For intermittent Misfire DTCs check for restrictions in the Intake and Exhaust system, improper installation of Sensors, vacuum leaks, and binding components driven by the accessory drive belt.
A co-pilot, data recording, and/or lab scope should be used to help diagnose intermittent conditions.
Use the DRBIII® to perform a System Test if one applies to failing component.
Were any problems found during the above inspections?
- Yes --> Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
- No --> Test Complete.
- Yes --> Repair as necessary