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Home >> Ford >> 2022 >> Mustang Mach 1 Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 34 (Automatic Transmission External Controls - 7-Speed Automatic Transmission - Tr9070) >> Diagnosis And Testing >> External Controls >> Pinpoint Tests >> Pinpoint Test J: DTC P0814, P0915

Pinpoint Test J: DTC P0814, P0915

WARNING: This page is about a different variant/trim than selected.
  1. Refer to TRANSMISSION CONTROLS - TR9070 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The GSM uses 2 position sensors to monitor the position of the rotary shift knob. The GSM illuminates the appropriate gear indicator LED for each rotary shift knob position.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM P0814:00 Transmission Range Display Circuit: No Sub Type Information This DTC indicates the GSM detected a fault with the illumination of the proper gear indicator LED.
    GSM P0915:00 Gear Shift Position Circuit 'A' Range/Performance: No Sub Type Information This DTC indicates the GSM detected a fault with one or both rotary shift knob position sensors.

    Possible Sources 

    • Discharged battery/charging system
    • Connectors damaged or pushed-out terminals, circuit open, shorted to power or shorted to ground
    • GSM calibration
    • GSM

  2. J1 VERIFY THE BATTERY IS FULLY CHARGED

    • NOTE: If necessary, connect the battery charger to the vehicle battery to make sure a steady battery voltage is available while carrying out this test.

      VERIFY the battery is fully charged before proceeding with this test. REFER to: Battery .

    Is the battery fully charged? 

    Yes  GO to  J2
    No  CHARGE or INSTALL a new battery if necessary. REFER to: Battery .

  3. J2 CHECK GSM CALIBRATION LEVEL

    • VERIFY the GSM calibration is at the latest level.

    Is the GSM calibration at the latest level? 

    Yes  GO to  J3
    No  REFER to: MODULE PROGRAMMING

  4. J3 CHECK POWER CIRCUIT TO GSM FOR AN OPEN

    • Ignition OFF.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2532-1
      GFD719146Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  J4
    No  VERIFY BCM fuse 12 (7.5A) is OK. If the fuse is OK, REFER to OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair the high resistance or open circuit. If the fuse is not OK, REFER to OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair the short to ground.

  5. J4 CHECK GSM GROUND FOR AN OPEN

    • Ignition OFF.

    • NOTE: INSPECT the ground eyelet G202 and verify it is clean and tight.

      Measure:

      Positive Lead Measurement / Action Negative Lead
      C2532-18
      GFD719147Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2532-9
      GFD719147Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances less than 3 ohms? 

    Yes  GO to  J5
    No  REPAIR the circuit.

  6. J5 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.

    • Ignition OFF.

    • Wait 10 seconds.

    • Start the engine.

    • Repeat the following steps 3 times:

      • Select Reverse.

      • Select Neutral.

      • Select Drive.

      • Select Park.

    • Using a diagnostic scan tool, CARRY OUT the GSM self-test.

    Is DTC P0814 or P0915 retrieved again? 

    Yes  CHECK OASIS for any applicable TSB. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSB addresses this concern, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) .
    No  The GSM is operating correctly at this time.
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