Diagnostic Aids

Perform this test when instructed during SYMPTOM DIAGNOSIS or another SYSTEM TEST. This test is intended to diagnose the following:

• Harness circuits; A/C SIG, GND, PCM REF and PWR.
• A/C relay.
• High pressure switch.
• PCM.

Fig 1: Identifying A/C Relay Circuits & Terminals

Courtesy of FORD MOTOR CO.

Fig 2: Identifying High Pressure Switch Circuits & Harness Connector Terminals

Courtesy of FORD MOTOR CO.