Pinpoint Tests Ah: Cooling Fan: Introduction

WARNING: DO NOT OPERATE THE ENGINE WITH THE HOOD OPEN UNTIL THE FAN BLADE HAS BEEN EXAMINED FOR POSSIBLE CRACKS AND SEPARATION. A DAMAGED FAN CAN SEPARATE DURING OPERATION. FAILURE TO FOLLOW THIS INSTRUCTION MAY RESULT IN SERIOUS PERSONAL INJURY.

NOTE: Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.

This pinpoint test is intended to diagnose the following:

cooling fan (8600)
cooling fan clutch (8A616)
fan speed sensor (FSS) (8A616)
fan control (FC1, FC2) relays
harness circuits
PCM (12A650)

Fig 1: Cooling Fan Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
4	FSS (Fan Speed Sensor)
5	PWRGND (Power Ground)
2	VBPWR (Vehicle Buffered Power)
6	FCV (Fan Control Variable)
1	VPWR (Vehicle Power)

Fig 2: Cooling Fan Motor 1 Connector

Courtesy of FORD MOTOR CO.

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

Fig 3: Fan Control 1 (FC1) Relay Connector

Courtesy of FORD MOTOR CO.

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

Fig 4: Fan Control 2 (FC2) Relay Connector

Courtesy of FORD MOTOR CO.

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

Fig 5: Powertrain Control Module-B (PCM-B) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-Series Super Duty	A	12 70, 71, 72, 73, 74 1 34	FSS PWRGND VBPWR FCV
Transit	B	2, 3, 42, 53, 7 27 52	PWRGND HFC LFC
All other vehicles	A	12 70, 71, 72, 73, 74 34	FSS PWRGND FCV