PINPOINT TEST HV: Electric Cooling Fan: Introduction

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: TO AVOID THE POSSIBILITY OF PERSONAL INJURY OR DAMAGE TO THE VEHICLE, DO NOT OPERATE THE ENGINE UNTIL THE FAN BLADE HAS BEEN FIRST EXAMINED FOR POSSIBLE CRACKS AND SEPARATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.

NOTE: Before starting this pinpoint test, turn the clutch fan assembly by hand and check for mechanical binding around the fan shroud or surrounding components. If binding is present, correct the problem then continue with the pinpoint test. If no binding is present, start the engine and warm up to normal operating temperature then continue with the pinpoint test.

This pinpoint test is intended to diagnose the following:

electric cooling fan
harness circuits: fan speed sensor (FSS), FSS PWRGND, FSS VPWR, fan control variable (FCV), and FCV VPWR
powertrain control module (PCM) (12A650)

Fig 1: Identifying Cooling Fan Connector
Courtesy of FORD MOTOR CO.

Powertrain Control Module (PCM) Connector

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

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PINS REFERENCE CHART

Pin	Circuit
B67, B68	VPWR (Vehicle Power)
B3	FSS (Fan Speed Sensor)
B69, B70	PWRGND (Power Ground)
B1, E36, T3	VBPWR (Vehicle Buffered Power)
B34	FCV (Fan Control Variable)