Diagnostic Aids
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test when instructed during QUICK TEST or SYMPTOM DIAGNOSIS. This test is only intended to diagnose the following:
- Idle Air Control (IAC) valve.
- Idle Speed Control (ISC) valve.
- Harness circuits; IAC, ISC and VPWR .
- PCM.
NOTE:
Idle Speed Control (ISC) valve and Idle Air Control (IAC) valve are an integrated component.
Perform all PRELIMINARY INSPECTIONS before proceeding to testing.