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.
AB14 CHECK THE VOLTAGE CIRCUITS
• Cold Start Fuel Pump connector disconnected.
• Cold Start Valve connector disconnected.
• PCM Power Relay connector disconnected.
• Measure the resistance between:
( + ) Cold Start Fuel Pump Connector, Harness Side | ( - ) Cold Start Relay Connector, Harness Side |
|---|---|
CSM - Pin 2 | CSM |
• Measure the resistance between:
( + ) PCM Power Relay Connector, Harness Side | ( - ) Cold Start Valve Connector, Harness Side |
|---|---|
VPWR - Pin 5 | VPWR |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to AB15 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
AB15 CHECK THE CIRCUIT FOR A SHORT
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) Cold Start Relay Connector, Harness Side | ( - ) |
|---|---|
CSM | Ground |
Is any voltage present?
Yes | No |
|---|---|
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. | GO to AB16 . |
AB16 CHECK THE FUEL PUMP GND CIRCUIT
• Ignition OFF.
• Measure the resistance between:
( + ) Cold Start Fuel Pump Connector, Harness Side | ( - ) |
|---|---|
GND - Pin 1 | 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.