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.
DK: Accelerator Pedal Position (APP) Sensor
DK: Introduction
DK1 CHECK FOR DTCS
Are DTCs P1575, P2122, P2123, P2127, P2128, or P2138 present?
Yes | No |
|---|---|
GO to DK2 . | For a lack/loss of power symptom, GO to DK2 . For all others, RETURN to Section 3 , Symptom Charts for further direction. |
DK2 CHECK THE ACCELERATOR PEDAL FOR OBSTRUCTION
• Ignition ON, engine OFF.
• Press the accelerator pedal fully to the floor and release.
Does the pedal move freely to the floor and back?
Yes | No |
|---|---|
For Fiesta, GO to DK3 . For all others, GO to DK4 . | ISOLATE and REPAIR the obstruction. Clear the PCM DTCs. REPEAT the self-test. |
DK3 CHECK FOR INSTRUMENT PANEL CLUSTER (IPC) DTCS
• Carry out the ICIPC self-test.
Are any IPC DTCs present other than DTC B1029?
Yes | No |
|---|---|
DISREGARD the current DTC at this time. DIAGNOSE the next DTC. REFER to the Workshop Manual Section 413-01, Instrumentation, Message Center, and Warning Chimes. | GO to DK8 . |
DK4 CHECK THE APPVREF VOLTAGE TO THE APP SENSOR
• Ignition OFF.
• APP Sensor connector disconnected.
• Ignition ON, engine OFF.
• Measure the voltage between:
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.