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.
JE4 CHECK THE FUNCTIONALITY OF THE SUSPECT COIL DRIVER (CD) CIRCUIT
• Ignition OFF.
• Remove the fuel pump fuse to disable the fuel pump.
• Connect a test lamp between VPWR and the suspect CD circuit (determined from the table) at the coil pack harness connector.
• Observe the test lamp while cranking the engine.
Does the test lamp blink consistently?
Yes | No |
|---|---|
GO to JE8 . | GO to JE5 . |
JE5 CHECK THE SUSPECT CD CIRCUIT FOR AN OPEN
• Ignition OFF.
• PCM connector disconnected.
• Measure the resistance between:
( + ) Coil Pack Assembly Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
Suspect coil driver | Suspect coil driver |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
GO to JE6 . | REPAIR the open circuit. CARRY out the misfire monitor drive cycle. REFER to Section 2, On Board Diagnostic (OBD) Drive Cycle. Clear the PCM DTCs. REPEAT the self-test. |
JE6 CHECK THE SUSPECT CD CIRCUIT FOR A SHORT TO VOLTAGE
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) Coil Pack Assembly Connector, Harness Side | ( - ) |
|---|---|
Suspect coil driver | Ground |
Is any voltage present?
Yes | No |
|---|
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.