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.
KF11 CHECK THE HFC CIRCUIT FOR A SHORT TO GROUND
• For Fiesta 1.0L,
• Measure the resistance between:
( + ) FC3 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HFC | HFC |
• For Focus 2.3L and MKC with 5 fan relays,
• Measure the resistance between:
( + ) FC3 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HFC | HFC |
• Measure the resistance between:
( + ) FC5 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HFC - Pin 2 | HFC |
• For all others,
• Measure the resistance between:
( + ) FC2 Relay Connector, Harness Side | ( - ) |
|---|---|
HFC | Ground |
• Measure the resistance between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
HFC | Ground |
Are the resistances greater than 10K ohms?
Yes | No |
|---|---|
GO to KF12 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
KF12 CHECK THE HFC CIRCUIT FOR A SHORT TO VOLTAGE
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|---|
HFC | Ground |
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.