Pinpoint Test HV: Cooling Fan Clutch: Introduction
WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Lincoln Town Car, and 2009 Lincoln MKZ. 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:
- cooling fan clutch
- harness circuits: fan speed sensor (FSS), FSS PWRGND, FSS VPWR, fan control variable (FCV), and FCV VPWR
- powertrain control module (PCM) (12A650)
For PCM connector views or reference values, refer to REFERENCE VALUES .
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR
| Vehicle | Pin | Circuit |
|---|---|---|
| Explorer, Explorer Sport Trac, Mountaineer |
B35, B36 E24 B47, B48, B49, B50 E20 E7 |
VPWR FSS PWRGND VBPWR FCV |
| All other vehicles | B67, B68 B12 B22, B69, B70 B1 B34 |
VPWR FSS PWRGND VBPWR FCV |