PINPOINT TEST KF: Fan Control Relays: Introduction

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This pinpoint test is intended to diagnose the following:

CAC fan relay
fan control (FC1, FC2, FC3, FC4, FC5) relays
harness circuits: CACCF, FGC, LFC, MFC, HFC and VPWR
PCM (12A650)

Although the PCM output circuits are called LFC, MFC, and HFC, cooling fan operation is controlled by a combination of these outputs.

COOLING FAN STATE

	PCM Output	Low Speed	Medium Speed	High Speed
Vehicles With 5 Fan Control Relays	LFC	ON	ON	ON
	MFC	OFF	ON	ON
	HFC	OFF	OFF	ON
All Others	LFC	ON	N/A	ON
	HFC	OFF	N/A	ON

Fig 1: Charge Air Cooler Cooling Fan Relay Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
VPWR (Vehicle Power)	1
B+ (Battery Positive Voltage)	3
CACCF (Charge Air Cooler Cooling Fan)	2
FANPWR (Fan Power)	5

Fig 2: Charge Air Cooler Cooling Fan Motor Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
FANPWR (Fan Power)	1
GND (Ground)	2

Fig 3: Cooling Fan Motor 1 Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
FANPWR (Fan Power)	1
FC (Fan Control)	2

Fig 4: Cooling Fan Motor 2 Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
FANPWR (Fan Power)	1
GND (Ground)	2

Fig 5: Fan Control 1 (FC1) Relay Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
VPWR (Vehicle Power)	2
B+ (Battery Positive Voltage)	3
LFC (Low Fan Control)	1
FANPWR (Fan Power)	5

Fig 6: Fan Control 2 (FC2) Relay Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
VPWR (Vehicle Power)	2
HFC (High Fan Control)	1
FANPWR (Fan Power)	4
FGC (Fan Ground Control)	3
GND (Ground)	5

NOTE: The HFC circuit may be wired to the FC3 and FC5 relays. Refer to the Wiring Diagrams Manual for additional information.

Fig 7: Fan Control 3 (FC3) Relay Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
VPWR (Vehicle Power)	2
B+ (Battery Positive Voltage)	5
HFC (High Fan Control)	1
FANPWR (Fan Power)	3

NOTE: The MFC circuit may be wired to the FC2 and FC4 relays. Refer to the Wiring Diagrams Manual for additional information.

Fig 8: Powertrain Control Module (PCM) Connector - For PCM Connector Views

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
HFC (High Fan Control)	B39
LFC (Low Fan Control)	B43