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.
JB10 COMPONENT INSPECTION
• Inspect the coil boots for the missing cylinders. Install a new coil boot if necessary. Refer to the Workshop Manual Section 303-07, Engine Ignition.
• Inspect the spark plugs for the missing cylinders. Measure the resistance of the spark plugs. Install a new spark plug if the resistance is lower than 2,000 ohms or higher than 12,000 ohms at a room temperature of 25°C (77°F).
• For the 6.2L engine,
• Inspect the exhaust spark plug wires for damaged insulation, burns, and high voltage etching in either of the boots for the missing cylinders. Install a new exhaust spark plug wire if the resistance is lower than 5,875 ohms or higher than 7,875 ohms at a room temperature of 25°C (77°F).
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. | For F-Series Super Duty 6.2L, GO to JB12 . For all others, GO to JB11 . |
JB11 CHECK THE SECONDARY COIL RESISTANCE FOR THE MISSING CYLINDERS
• Ignition OFF.
• Suspect Coil Assembly connector disconnected.
• Measure resistance between: Suspect coil connector, VPWR, component side and ignition coil spring, located in the ignition coil boot.
Is the resistance between 5,000 and 6,000 ohms?
Yes | No |
|---|---|
GO to Pinpoint Test Z . | INSTALL a new COP. Clear the PCM DTCs. REPEAT the self-test. |
JB12 CHECK THE SECONDARY COIL RESISTANCE
• Ignition OFF.
• Measure resistance between: Suspect coil connector, VPWR, component side and ignition coil spring, located in the ignition coil boot.
Is the resistance between 33,900 ohms and 41,500 ohms at a room temperature of 25°C (77°F)?
Yes | No |
|---|---|
GO to Pinpoint Test Z . | INSTALL a new COP. 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.