PINPOINT TEST KF: Fan Control Relays: Introduction
WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2012 Lincoln Navigator L, 2012 Lincoln Navigator, 2012 Lincoln MKZ, 2012 Lincoln MKX, and 2012 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
This pinpoint test is intended to diagnose the following:
- low and high FC relays
- harness circuits: LFC, HFC and VPWR
- powertrain control module (PCM) (12A650)
Two Speed Fan Operation
Although the PCM output circuits are called low and high fan control (FC), cooling fan operation is controlled by a combination of these outputs.
Refer to ENGINE CONTROL COMPONENTS .
NOTE:
The VPWR and LFC circuits may be reversed in the harness connector. Also, the LFC circuit may be wired to two separate relays. Refer to the appropriate System Wiring Diagrams article for additional information.
NOTE:
The VPWR and HFC circuits may be reversed in the harness connector. Also, the HFC circuit may be wired to two separate relays. Refer to the appropriate System Wiring Diagrams article for additional information.
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to REFERENCE VALUES article.
| Vehicle | Pin | Circuit |
|---|---|---|
| F-150 3.5L | B23 | HFC |
| B4 | LFC | |
| Fiesta | B13 | LFC |
| All other vehicles | B18 | HFC |
| B34 | LFC |