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.
KF8 CHECK THE VOLTAGE TO THE RELAYS
• FC3 Relay connector disconnected.
• Ignition ON, engine OFF.
• For Fiesta 1.0L,
• Measure the voltage between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
B+ | Ground |
• For Focus 2.3L and MKC with 5 fan relays,
• FC3 Relay connector disconnected.
• FC5 Relay connector disconnected.
• Measure the voltage between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
• Measure the voltage between:
( + ) FC5 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR - Pin 1,5 | Ground |
B+ - Pin 3 | Ground |
• For all others,
• FC2 Relay connector disconnected.
• Measure the voltage between:
( + ) FC2 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
• Measure the voltage between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
B+ | Ground |
Are the voltages greater than 10.5 V?
Yes | No |
|---|---|
GO to KF9 . | 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.