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Home >> Ford >> 2008 >> Escape Hybrid, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Hybrid) - Pinpoint Tests Dm - HH >> PINPOINT TEST FE: Ignition Switch Inputs >> Test Procedure

Test Procedure

  1. FE1 DTCS P2531 AND P2535: CHECK FOR SELF-TEST DTCS 
    • Are DTCs P2531 or P2535 present during PCM or transaxle control module (TCM) self-test? 
    Yes No
    For DTC P2531, GO to  FE2.
    For DTC P2535, GO to  FE6.    		 GO to  FE8.
  2. FE2 DTC P2531: CHECK THE KEYST PID 
    • Access the PCM and monitor the KEYST PID.
    • Key ON, engine OFF.
    • Does the PID indicate RUN? 
    Yes No
    GO to  FE8. GO to  FE3.
  3. FE3 CHECK FUSES 
    • Key in OFF position.
    • Inspect all the ignition switch related fuses.
    • Are the ignition switch fuses OK? 
    Yes No
    GO to  FE4. INSTALL a new fuse as necessary.
    GO to  FE5.
  4. FE4 CHECK THE IGNITION SWITCH AND HARNESS FOR AN OPEN 
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      ISP-R - Pin B22 Negative terminal
    • Is the voltage greater than 10.5 V? 
    Yes No
    GO to  FE9. CHECK for a damaged ignition switch.
    REFER to the Wiring Diagrams Cell 149 Component Testing.
    If the ignition switch is OK, REPAIR the open circuit.
    CLEAR the DTCs. REPEAT the self-test.
  5. FE5 CHECK THE ISP-R CIRCUIT FOR A SHORT TO GND IN THE HARNESS 
    • Ignition Switch connector disconnected.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      ISP-R - Pin B22 Negative terminal
    • Is the resistance greater than 10K ohms? 
    Yes No
    CHECK the ignition switch for a short to ground. If OK,
    GO to  FE9.    		 REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  6. FE6 DTC P2535: CHECK FOR CORRECT KEY OPERATION 
    • Key ON, engine OFF.
    • Does the engine start with the ignition key in ON position? 
    Yes No
    GO to  FE7. GO to  FE8.
  7. FE7 CHECK THE ISP-R/S CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) Vehicle Battery
      ISP-R/S - Pin B21 Negative terminal
    • Is the voltage less than 1 V? 
    Yes No
    GO to  FE9. CHECK for a damaged ignition switch.
    REFER to the Wiring Diagrams Cell 149 Component Testing.
    If the ignition switch is OK, REPAIR the circuit.
    CLEAR the DTCs. REPEAT the self-test.
  8. FE8 CHECK THE ISP-R AND ISP-R/S CIRCUITS FOR INTERMITTENT CONCERNS 
    • Key ON, engine OFF.
    • Access the PCM and monitor the KEYST PID.
    • Turn the key to the ON and START positions, while observing the related ignition PID.

      Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.

    • Is a concern present during the wiggle test? 
    Yes No
    REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 refer to PINPOINT TEST Z .
  9. FE9 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM.
    REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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