Diagnostic Aids

NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all electronic engine control systems are working properly and DTCs are no longer present.

Perform this test when directed by QUICK TEST. This test is only intended to diagnose the following components and circuits:

A/C Wiring Harness Circuits
A/C Clutch
Powertrain Control Module (PCM)

Fig 1: Identifying A/C Pressure Switch Circuits (Econoline & F650-750)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying A/C Pressure Switch Circuits (Excursion With EATC)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying A/C Pressure Switch Circuits (Excursion & F250-550 W/O EATC)

Courtesy of FORD MOTOR CO.