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Circuit/System Testing

ECM Park Switch Malfunction

  1. Inspect the range selector lever cable for proper adjustment. Refer to Range Selector Lever Cable Adjustment .
  2. Ignition OFF, disconnect the harness connector at the transmission inline 20-way connector.
  3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal 18 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, test for greater than 5 V between the signal circuit terminal 20 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement .
  6. Connect the transmission inline 20-way connector. Disconnect the shift position switch from the TCM.
  7. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal A of the TCM and ground.
    • If greater than the specified range, replace the TCM.
  8. Ignition ON, verify the scan tool PNP Switch parameter is In Gear.
    • If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the ECM.
  9. Install a 3 A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool PNP Switch parameter is Park/Neutral.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  10. If all circuits test normal, test or replace the internal mode switch.

CRNK Relay Malfunction

  1. Ignition OFF, disconnect the CRNK relay.
  2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal 85 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal 87 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  5. Apply the parking brake and shift the transmission into park. Momentarily connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the starter solenoid engages and the engine begins cranking.
    • If it does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the starter motor.
  6. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  7. Transmission in park, turn the ignition switch between the OFF and CRANK positions. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all circuits test normal, test or replace the CRNK relay.
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