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.
KF9 CHECK FC2 AND FC3 RELAYS
Is a concern present?
Yes | No |
|---|---|
INSTALL a new relay in question. Clear the PCM DTCs. REPEAT the self-test. | GO to KF10 . |
KF10 CHECK THE HFC CIRCUIT FOR AN OPEN
• Ignition OFF.
• PCM connector disconnected.
• 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 | ( - ) PCM Connector, Harness Side |
|---|---|
HFC | HFC |
• Measure the resistance between:
( + ) FC3 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
HFC | HFC |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to KF11 . | 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.