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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> Starter Solenoid Does Not Click >> Circuit/System Testing >> ECM Park Switch Malfunction

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.
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