Additional Checks
- Check for faulty PCM grounds.
- Check for open diodes (A/C clutch, charging system, etc.) that may cause electrical interference.
- The improper installation of add-on electrical devices. These can include alarm systems, 2-way radios, lighting systems and electrical motors.
- If the intermittent fault is believed to involve a particular sensor or component, observe sensor or component display on a scan tool while moving the connectors and wiring harnesses related to the sensor or component. A change in scan tool display can indicate location of the fault.