Three Speed Fan Operation

Although the PCM output circuits are called low, medium and high fan control (FC), cooling fan operation is controlled by a combination of these outputs.

Refer to ENGINE CONTROL COMPONENTS .

Fig 1: Low Fan Control (LFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR and LFC circuits may be reversed in the harness connector. Also, the LFC circuit may be wired to two separate relays. Refer to the appropriate System Wiring Diagram article for additional information.

Fig 2: Medium Fan Control (MFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR and MFC circuits may be reversed in the harness connector. Also, the MFC circuit may be wired to two separate relays. Refer to the for additional information.

Fig 3: High Fan Control (HFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR and HFC circuits may be reversed in the harness connector. Also, the HFC circuit may be wired to two separate relays. Refer to the appropriate SYSTEM WIRING DIAGRAMS article for additional information.

For PCM connector views or reference values, refer to REFERENCE VALUES .

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR

Vehicle	Pin	Circuit
Mustang	E4 E7	HFC LFC
Ranger	E7	LFC
All other vehicles	B18 B34	HFC LFC