Pinpoint Test KF: Fan Control (FC) Relays: Introduction

This pinpoint test is intended to diagnose the following:

low and high FC relays
harness circuits: LFC, HFC and VPWR
powertrain control module (PCM) (12A650)

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

Refer to ENGINE CONTROL COMPONENTS .

Fig 1: Cooling Fan Motor Connector

Courtesy of FORD MOTOR CO.

Fig 2: 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 DIAGRAMS article 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 PIN REFERENCE CHART

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