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.
QB: Keep Alive Power (KAPWR)
QB: Introduction
QB1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Note: The DTC P2610 may set after a PCM reprogramming. If this DTC is retrieved after a PCM reprogramming, disregard this DTC.
• Carry out a visual inspection.
• Record the DTCs.
• Record the freeze frame data.
• Clear the PCM DTCs.
• Carry out the PCM self-test.
Are DTCs P0603, P1633 or P2610 present?
Yes | No |
|---|---|
For DTC P2610, GO to QB6 . For all others, GO to QB2 . | Unable to duplicate the condition. CHECK for a loose connection, and damaged or corroded pins. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to Section 3, GO to Pinpoint Test QT , if a driveability concern exists. Clear the PCM DTCs. REPEAT the self-test. |
QB2 CHECK THE 12-VOLT BATTERY TERMINALS
Note: If the KAPWR is interrupted to the PCM, a DTC can be generated on the first power-up.
Note: If DTC P0603 occurred right after or during an unsuccessful reprogramming of the PCM, clear the DTCs and repeat the PCM self-test. If DTC P0603 is retrieved again, continue with this pinpoint test.
• Inspect the 12 volt battery cables for loose connections and for corrosion.
Are the 12 volt battery terminal connections in good condition?
Yes | No |
|---|---|
GO to QB3 . | REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. |
QB3 INSPECT THE ENGINE COMPARTMENT FOR CORRECT WIRE ROUTING
• Inspect the electronic engine control (EEC) system wiring for correct wire routing.
• Check the wiring routing to establish if any of the electrical connectors are being stressed due to incorrectly routed wiring. If necessary re-route and secure the wiring.
• Visually inspect the wiring and connectors.
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.