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.
• Measure the voltage between:
( + ) FC1 Relay Connector, Harness Side | ( - ) |
|---|---|
B+ - Pin 3 | Ground |
VPWR - Pin 1 | Ground |
• Measure the voltage between:
( + ) FC3 Relay Connector, Harness Side | ( - ) |
|---|---|
B+ - Pin 5 | Ground |
VPWR - Pin 1 | Ground |
• For all others,
• FC Relay connector disconnected.
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) FC Relay Connector, Harness Side | ( - ) |
|---|---|
B+ | Ground |
VPWR | Ground |
Are the voltages greater than 10.5 V?
Yes | No |
|---|---|
GO to KN7 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KN7 CHECK THE RELAY
• Carry out the Relay Component Test. Refer to Wiring Diagrams Cell 149.
Is a concern present?
Yes | No |
|---|---|
INSTALL a new FC relay in question. Clear the PCM DTCs. REPEAT the self-test. | GO to KN8 . |
KN8 CHECK THE RELAY GROUND
• Ignition OFF.
• For Edge and MKX,
• Measure the resistance between:
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.