Pinpoint Tests AH: Cooling Fan: Introduction
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2022 Ford F-550 Super Duty, 2022 Ford F-450 Super Duty, 2022 Ford F-350 Super Duty, 2022 Ford F-250 Super Duty, and 2021 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
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)
- harness circuits
- PCM (12A650)
| Pin | Circuit |
|---|---|
| 6 | FCV (Fan Control Variable) |
| 1 | VPWR (Vehicle Power) |
| 4 | FSS (Fan Speed Sensor) |
| 5 | SIGRTN (Signal Return) |
| 3 | VBPWR (Vehicle Buffered Power) |
| Pin | Circuit |
|---|---|
| 80 | FCV (Fan Control Variable) |
| 70 | SIGRTN (Signal Return) |
| 37 | FSS (Fan Speed Sensor) |
| 38 | VBPWR (Vehicle Buffered Power) |