Checking for an Intermittent DTC

CHECKING FOR AN INTERMITTENT DTC

For a complete wiring diagram Refer to the Wiring Information.
INTERMITTENT DTC

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

1. The conditions necessary to set this DTC are not present at this time.
2. Review the scan tool environmental data. If possible, try to duplicate the conditions under which the DTC set.
3. If applicable, actuate the component with the scan tool.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
6. Search for any Technical Service Bulletins (TSBs) that may apply.
7. Turn the ignition off.
8. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
9. Perform a voltage drop test on the related circuits between the suspected component and the PCM.
10. Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
11. If numerous trouble codes were set, use a schematic and inspect any common ground or supply circuits.
12. For intermittent Misfire DTCs check for restrictions in the Intake and Exhaust system, proper installation of Sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
13. Use the scan tool to perform a System Test if one applies to the component.
14. A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.

Were any problems found during the above inspections?

Yes

- Perform the necessary repairs.
- Perform the PCM Verification Test. PCM Verification Test

No

- Test Complete.