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Home >> GMC >> 2017 >> Yukon Denali, RWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> Starter Solenoid Does Not Click >> Circuit/System Testing

Circuit/System Testing

NOTE:

You must perform Circuit/System Verification first.

Starter Relay Malfunction 

  1. Ignition ON.
  2. Verify the scan tool ECM Ignition 1 Signal parameter is greater than 10 V.
    • If 10 V or less 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the ignition voltage circuits and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
    • If greater than 10 V 
  3. Ignition OFF, disconnect the KR27 Starter Relay, ignition ON.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance,
    3. Disconnect X1 harness connector at the M64 Starter Motor.
    4. Test for infinite resistance between the control circuit terminal 87 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M64 Starter Motor.
    • If the test lamp illuminates 
  5. Ensure the parking brake is applied and the T12 Transmission is in PARK. Momentarily install a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  6. Verify the M64 Starter Motor is activated.
    • If the M64 Starter Motor does not activate 
    1. Disconnect the X1 harness connector at the M64 Starter Motor.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If greater the 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M64 Starter Motor.
    • If the M64 Starter Motor activates 
  7. Test or replace the KR27 Starter Relay.

Park/Neutral Position Switch Malfunction 

  1. Ignition OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly on the automatic transmission.
  2. Install the DT-47825-10  jumper harness to the X1 vehicle harness connector.
  3. Test for less than 5 Ω between the ground circuit terminal 5 at the DT-47825-10  jumper harness and ground at the transmission case.
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit from wire end to wire end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  4. Ignition ON.
  5. Test for 11 - 13 V between the signal circuit terminal 3 at the DT-47825-10  jumper harness and ground at the transmission case.
    • If not between 11 - 13 V 
    1. Ignition OFF, disconnect the X1harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the Park/Neutral signal circuit terminal 3 at the DT-47825-10  jumper harness and ground at the transmission case.
      • If less than infinite resistance, repair the short to ground in the signal circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the Park/Neutral signal circuit wire end to wire end.
    • If 2 Ω or greater, repair the open/high resistance in the signal circuit.
    • If less than 2 Ω, replace the K20 Engine Control Module.
    • If between 11 - 13 V 
  6. Ignition OFF, disconnect the DT-47825-10  jumper harness from the X1 vehicle harness connector.
  7. Connect the DT-47825-10  jumper harness to the Q8 Control Solenoid Valve Assembly harness connector at the transmission case.
  8. Remove the transmission fluid pan.
  9. Disconnect the B15 Transmission Internal Mode Switch electrical connector from the Q8 Control Solenoid Valve Assembly.
  10. Test for less than 2 Ω between the ground circuit terminal 5 and terminal A at the B15 Transmission Internal Mode Switch connector on the Q8 Control Solenoid Valve Assembly.
    • If 2 Ω or greater 

      Replace the Q8 control solenoid valve assembly.

    • If less than 2 Ω 
  11. Ignition OFF.
  12. Connect the DT-47825-10  jumper harness to the X1 vehicle harness connector.
  13. Ignition ON.
  14. Test for 11 - 13 V between terminal F at the B15 Transmission Internal Mode Switch connector on the Q8 Control Solenoid Valve Assembly and ground at the transmission case.
    • If not between 11 - 13 V 

      Replace the Q8 control solenoid valve assembly.

    • If between 11 - 13 V 
  15. Connect a 3 A fused jumper wire between terminal F at the B15 Transmission Internal Mode Switch on the Q8 Control Solenoid Valve Assembly and ground at the transmission case.
  16. Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays Park/Neutral.
    • If Park/Neutral is not displayed 

      Replace the K20 Engine Control Module.

    • If Park/Neutral is displayed 
  17. Replace the B15 Transmission Internal Mode Switch.
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