Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TESTS (EXCEPT DIESEL & HYBRID) (HC TO Z)PINPOINT TESTS KF: FAN CONTROL RELAYSINTRODUCTION
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
Pinpoint Tests KF: Fan Control Relays: Introduction
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Introduction
This pinpoint test is intended to diagnose the following:
- CAC fan relay
- fan control (FC1, FC2, FC3, FC4, FC5) relays
- harness circuits: CACCF, FGC, LFC, MFC, HFC and VPWR
- PCM (12A650)
Although the PCM output circuits are called LFC, MFC, and HFC, cooling fan operation is controlled by a combination of these outputs.
COOLING FAN STATE
| PCM Output | Low Speed | Medium Speed | High Speed | |
|---|---|---|---|---|
| Vehicles With 5 Fan Control Relays | LFC | ON | ON | ON |
| MFC | OFF | ON | ON | |
| HFC | OFF | OFF | ON | |
| All Others | LFC | ON | N/A | ON |
| HFC | OFF | N/A | ON |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| KA Automatic Transmission | A | 47 42 36 |
FANPWR HFC LFC |
| KA Manual Transmission | A | 47 42 |
FANPWR LFC |
| Transit Connect | A | 6 | CACCF |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Corsair, Escape/Kuga, Transit Connect | A | 1 | FANPWR |
| E-Series, Motorhome/Stripped Chassis/Step Van |
A | 34 | FANPWR |
| Expedition High Output, Navigator | A | 47 26 2 |
GND FANPWR FANPWR |
| Pin | Circuit |
|---|---|
| 6 | HFC (High Fan Control) |
| 10 | LFC (Low Fan Control) |
| 19 | CACCF (Charge Air Cooler Cooling Fan) |
| Pin | Circuit |
|---|---|
| 47 | FANPWR (Fan Power) |
| Vehicle | Connector | Circuit | |
|---|---|---|---|
| Ford GT | A | 3 | FANPWR CACCF B+ VPWR |
| All other vehicles | A | 5 2 3 1 |
FANPWR CACCF B+ VPWR |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Transit Connect 1.0L | A | 2 1 |
GND FANPWR |
| All other vehicles | B | 2 1 |
GND FANPWR |
| Pin | Circuit |
|---|---|
| 2 | GND (Ground) |
| 1 | FANPWR (Fan Power) |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| EcoSport, KA | A | 1 2 |
GND FANPWR |
| Ranger 2.5L | B | 1 3 2 |
GND FANPWR FANPWR |
| All other vehicles | A | 2 1 |
FC FANPWR |
| Pin | Circuit |
|---|---|
| 2 | GND (Ground) |
| 1 | FANPWR (Fan Power) |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Continental, EcoSport, Edge, KA, Nautilus, Ranger 2.5L | A | FANPWR LFC B+ VPWR | |
| Mustang | A | 5 | FANPWR LFC B+ VPWR |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Continental, Edge, Nautilus | A | 5 3 4 2 1 |
GND FGC FANPWR HFC VPWR |
| EcoSport | B | 5 2 3 1 |
FANPWR HFC B+ VPWR |
| Mustang | A | 5 3 4 1 2 |
GND FGC FANPWR HFC VPWR |
| Ranger 2.5L | A | 5 2 3 1 |
FANPWR HFC B+ VPWR |
| Transit | B | 4 3 2 5 1 |
FGC FANPWR HFC B+ VPWR |
NOTE:
The HFC circuit may be wired to the FC3 and FC5 relays. Refer to the Wiring Diagrams article for additional information.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.