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.
( + ) FC1 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
B+ | Ground |
Are the voltages greater than 10.5 V?
Yes | No |
|---|---|
GO to KF4 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KF4 CHECK THE RELAYS
• Carry out the Relay Component Test. Refer to Wiring Diagrams Cell 149.
Is a concern present?
Yes | No |
|---|---|
INSTALL a new relay in question. Clear the PCM DTCs. REPEAT the self-test. | GO to KF5 . |
KF5 CHECK THE CACCF AND LFC CIRCUITS FOR AN OPEN
• Ignition OFF.
• PCM connector disconnected.
• For DTCs P028D or P028E,
• Measure the resistance between:
( + ) Charge Air Cooler Cooling Fan Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
CACCF - Pin 2 | CACCF |
• For all others,
• Measure the resistance between:
( + ) FC1 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
LFC | LFC |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
GO to KF6 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
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.