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.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. | For Fiesta 1.6L GTDI, or Focus 2.0L GTDI, GO to QB5 . For all others, GO to QB4 . |
QB4 CHECK KAPWR TO THE PCM
• Ignition OFF.
• PCM connector disconnected.
• Measure the voltage between:
( + ) PCM Connector, Harness Side | ( - ) 12 Volt Vehicle Battery |
|---|---|
KAPWR | Negative terminal |
Is the voltage greater than 10.5 V?
Yes | No |
|---|---|
GO to QB5 . | ISOLATE the concern and REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. |
QB5 CHECK FOR A REOCCURRENCE OF THE DTC
• PCM connector connected.
• Clear the PCM DTCs.
• Test drive the vehicle and allow the engine to reach normal operating temperature.
• Carry out the PCM self-test.
Is DTC P0603 or P1633 present?
Yes | No |
|---|---|
GO to QB8 . | Unable to duplicate or identify the concern at this time. GO to Pinpoint Test Z . |
QB6 CHECK THE ENGINE OFF TIMER
Note: Turning the ignition ON then OFF without an engine start for the purpose of checking the engine coolant temperature does not affect the test results.
• Ignition ON, engine running.
• Allow the engine to stabilize at the correct operating temperature.
• Ignition OFF.
• Ignition ON, engine OFF.
• Clear the PCM DTCs.
• Ignition OFF.
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.