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Home >> Ford >> 2021 >> Mustang Mach 1 Premium, Automatic Trans >> Repair and Diagnosis >> Electrical >> Starter >> Starting System - 5.0L 32V Ti-VCT (359KW/486PS) (WU)/5.0L Ti-VCT V8 (343KW/466PS) (MF) >> Diagnosis And Testing >> Starting System >> Pinpoint Test(s) >> Pinpoint Test D: P2535

Pinpoint Test D: P2535

  1. Refer to appropriate service information for schematic and connector information.

    Normal Operation and Fault Conditions 

    When the ignition switch - push button start has been pressed, the PCM receives a voltage signal on the crank detect circuit. When the required inputs have been received, the PCM supplies voltage and ground to the starter relay coil. The ignition switch - push button start is part of the FCIM and cannot be serviced separately. For more information, REFER to: Starting System - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P2535:00 Ignition Switch On/Start Position Circuit High: No Sub Type Information The PCM sets this DTC when the PCM detects voltage on the crank detect circuit while engine is running.

    Possible Sources 

    • Ignition switch - push button start
    • BCM
    • PCM
    • Wiring, terminals or connectors

  2. D1 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED

    • Ignition OFF.

    • Disconnect PCM C175B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-22
      GFD602206Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  GO to  D2
    No  GO to  D4

  3. D2 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE IGNITION SWITCH - PUSH BUTTON START DISCONNECTED

    • Ignition OFF.

    • Disconnect FCIM C2402A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-22
      GFD602206Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  GO to  D3
    No  Install a new ignition switch - push button start. REFER to: Front Controls Interface Module (FCIM) . or REFER to: Front Controls Interface Module (FCIM)

  4. D3 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE BCM (BODY CONTROL MODULE) DISCONNECTED

    • Ignition OFF.

    • Disconnect BCM C2280B.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-22
      GFD602206Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  BCM : A guided routine is not applicable for this vehicle and market. Replace the component that was faulted through diagnosis.

  5. D4 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM connectors.

    • Repair:

      • corrosion (install new connectors or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the PCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, refer to: PCM GUIDED ROUTINE TESTING .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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