Diagnostic Aids

CCRM interfaces with the EEC-V system to provide control for A/C clutch, cooling fan and Fuel Pump Driver Module (FPDM). CCRM also contains EEC-V power relay, which provides vehicle power (VPWR) to Powertrain Control Module (PCM) and EEC-V system. Perform this test only when instructed by QUICK TEST or if directed by a system test. This test is only intended to diagnose the following:

• Constant Control Relay Module (CCRM)
• Harness Circuits (B+, FC, LFC, HFC, ACCS, WAC, VPWR (To CCRM), A/C CLUTCH PWR, LOW FAN PWR, HIGH FAN PWR & GND). See Fig 1-Fig 3.
• Powertrain Control Module (PCM)

To prevent replacing good components, be aware the following non-EEC related components or systems may be at fault:

• A/C System
• Fuel System
• Starting & Charging System

Fig 1: Identifying Constant Control Relay Module Circuits (Mustang 3.8L)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Constant Control Relay Module Circuits (Mustang 4.6L)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Constant Control Relay Module Circuits (ZX2)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Constant Control Relay Module Connector Terminals

Courtesy of FORD MOTOR CO.