PINPOINT TEST KF: Fan Control (FC) Relays: Introduction

This pinpoint test is intended to diagnose the following:

• LFC, MFC, HFC relays
• harness circuits: HFC, LFC, MFC, VPWR
• powertrain control module (PCM) (12A650)

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 toENGINE 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 2 separate relays. Refer to the Wiring Diagrams 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 2 separate relays. Refer to the 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 2 separate relays. Refer to the Wiring Diagrams article for additional information.

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