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.
KF15 CHECK THE MFC CIRCUIT FOR AN OPEN
• PCM connector disconnected.
• Measure the resistance between:
( + ) FC2 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
MFC | MFC |
• Measure the resistance between:
( + ) FC4 Relay Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
MFC - Pin 2 | MFC |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to KF16 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KF16 CHECK THE MFC CIRCUIT FOR A SHORT TO GROUND
• Measure the resistance between:
( + ) FC2 Relay Connector, Harness Side | ( - ) |
|---|---|
MFC | Ground |
• Measure the resistance between:
( + ) FC4 Relay Connector, Harness Side | ( - ) |
|---|---|
MFC - Pin 2 | Ground |
Are the resistances greater than 10K ohms?
Yes | No |
|---|---|
GO to KF17 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
KF17 CHECK THE MFC CIRCUIT FOR A SHORT TO VOLTAGE
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|
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.