Pinpoint Tests KF: Fan Control Relays: Introduction

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2021 Lincoln Navigator, 2021 Lincoln Nautilus, 2021 Lincoln Corsair, 2021 Lincoln Aviator, and 2021 Ford Transit-350 HD. However, it is still accessible from the selected car via links, so may be relevant.

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: Battery Junction Box-A (BJB-A) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
KA Automatic Transmission	A	47 42 36	FANPWR HFC LFC
KA Manual Transmission	A	47 42	FANPWR LFC
Transit Connect	A	6	CACCF

Fig 2: Battery Junction Box-B (BJB-B) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Corsair, Escape/Kuga, Transit Connect	A	1	FANPWR
E-Series, Motorhome/Stripped Chassis/Step Van	A	34	FANPWR
Expedition High Output, Navigator	A	47 26 2	GND FANPWR FANPWR

Fig 3: Battery Junction Box-C (BJB-C) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
6	HFC (High Fan Control)
10	LFC (Low Fan Control)
19	CACCF (Charge Air Cooler Cooling Fan)

Fig 4: Battery Junction Box-D (BJB-D) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
47	FANPWR (Fan Power)

Fig 5: Charge Air Cooler Cooling Fan Relay Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector		Circuit
Ford GT	A	3	FANPWR CACCF B+ VPWR
All other vehicles	A	5 2 3 1	FANPWR CACCF B+ VPWR

Fig 6: Charge Air Cooler Cooling Fan Motor Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Transit Connect 1.0L	A	2 1	GND FANPWR
All other vehicles	B	2 1	GND FANPWR

Fig 7: Charge Air Cooler Cooling Fan 2 Motor Connector

Courtesy of FORD MOTOR CO.

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

Fig 8: Cooling Fan Motor 1 Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
EcoSport, KA	A	1 2	GND FANPWR
Ranger 2.5L	B	1 3 2	GND FANPWR FANPWR
All other vehicles	A	2 1	FC FANPWR

Fig 9: Cooling Fan Motor 2 Connector

Courtesy of FORD MOTOR CO.

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

Fig 10: Fan Control 1 (FC1) Relay Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Continental, EcoSport, Edge, KA, Nautilus, Ranger 2.5L	A		FANPWR LFC B+ VPWR
Mustang	A	5	FANPWR LFC B+ VPWR

Fig 11: Fan Control 2 (FC2) Relay Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Continental, Edge, Nautilus	A	5 3 4 2 1	GND FGC FANPWR HFC VPWR
EcoSport	B	5 2 3 1	FANPWR HFC B+ VPWR
Mustang	A	5 3 4 1 2	GND FGC FANPWR HFC VPWR
Ranger 2.5L	A	5 2 3 1	FANPWR HFC B+ VPWR
Transit	B	4 3 2 5 1	FGC FANPWR HFC B+ VPWR

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

Fig 12: Fan Control 3 (FC3) Relay Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Continental, Nautilus	A	5 2 3 1	FANPWR HFC B+ VPWR
Edge, Mustang	A	3 1 5 2	FANPWR HFC B+ VPWR
Transit	B	5 3 2 1	GND FGC HFC VPWR

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

Fig 13: Fan Control 4 (FC4) Relay Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
5	FANPWR (Fan Power)
4	FANRSTR2 (Fan Resistor 2)
2	MFC (Medium Fan Control)
1	VPWR (Vehicle Power)

Fig 14: Fan Control 5 (FC5) Relay Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
2	HFC (High Fan Control)

Powertrain Control Module (PCM) Connector

For PCM connector views or Reference values, Refer to Reference Values.

Vehicle	Connector	Pin	Circuit
Continental, EcoSport 2.0L	198 PIN	B B23	HFC LFC
EcoSport 1.0L Automatic Transmission	198 PIN	B4 B23 E19	HFC LFC CACCF
EcoSport 1.0L Manual Transmission	198 PIN	B3 B42 E19	HFC LFC CACCF
EcoSport 1.5L Automatic Transmission, KA 1.5L Automatic Transmission	198 PIN	B67 B66	HFC LFC
EcoSport 1.5L Manual Transmission	112 PIN	B27	HFC LFC B26

Edge 2.7L, Nautilus 2.7L, Transit	306 PIN	B89 B59	HFC LFC
Expedition High Output, Navigator High Output	198 PIN	B80 B41 B43	HFC LFC CACCF
Expedition Base, Navigator Base	306 PIN	B89 B59 B43	HFC LFC CACCF
Ford GT	198 PIN	B78	CACCF
KA 1.0L	128 PIN	E31	LFC
KA 1.2L, KA 1.5L Manual Transmission	112 PIN	B26	LFC
Mustang 5.0L	306 PIN	B89 B4	HFC LFC
Mustang 5.2L Supercharged	306 PIN	B10 B4	HFC LFC
Mustang TiVCT 5.2L	198 PIN	B10 B17	HFC LFC
Ranger	128 PIN	E29 T13	HFC LFC
Transit Connect	198 PIN	B61	CACCF
All other vehicles	198 PIN	B39 B43	HFC LFC