Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
( + ) Cooling Fan Motor 2 Connector, Harness Side | ( - ) |
|---|---|
GND - Pin 2 | Ground |
• Measure the resistance between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
GND | Ground |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to KF21 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KF21 COMMAND THE FANS ON AND CHECK FOR VOLTAGE TO THE COOLING FAN MOTORS
Note: Only measure the circuits that apply to the vehicle being diagnosed.
Note: Not all vehicles will have cooling fan motor 2, MFC PID, or the HFC PID.
• Ignition OFF.
• PCM connector connected.
• Charge Air Cooler Cooling Fan Relay connector connected.
• FC1 Relay connector connected.
• FC2 Relay connector connected.
• FC3 Relay connector connected.
• FC4 Relay connector connected.
• FC5 Relay connector connected.
• Ignition ON, engine OFF.
• Access the PCM and control the CACC_FAN (PER) PID.
• Access the PCM and control the LFC (MODE) PID.
• Access the PCM and control the MFC (MODE) PID.
• Access the PCM and control the HFC (MODE) PID.
• Command the PIDs ON.
• Measure the voltage between:
( + ) Charge Air Cooler Cooling Fan Motor Connector, Harness Side | ( - ) |
|---|---|
FANPWR - Pin 1 | Ground |
• Measure the voltage between:
( + ) Cooling Fan Motor 1 Connector, Harness Side | ( - ) |
|---|---|
FANPWR | Ground |
• Measure the voltage between:
( + ) Cooling Fan Motor 2 Connector, Harness Side | ( - ) |
|---|
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.