Pinpoint Test HV: Electric Cooling Fan Clutch: Introduction
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)
| Pin | Circuit |
|---|---|
| 3 | FSS (Fan Speed Sensor) |
| 4 | PWRGND (Power Ground) |
| 5 | VBPWR (Vehicle Buffered Power) |
| 1 | VPWR (Vehicle Power) |
| 2 | FCV (Fan Control Variable) |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to REFERENCE VALUES .
| 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) |