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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 321 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Starter Solenoid Clicks, Engine Does Not Crank (KL9) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, measure and record the battery voltage at the C1 terminals.
  2. Verify the measured voltage is between 12-15 V.
    • If voltage is between 12-15V 
  3. Remove the drive belts. Refer to Drive Belt Replacement for 2.5L (LCV).
  4. Verify the crankshaft rotates rotate the crankshaft by hand using the appropriate tools.
    • If the crankshaft rotates 
  5. Verify the engine does not crank when attempting to start the vehicle.
    • If the engine cranks 

      Inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator.

    • If the engine does not crank 
  6. Verify that a test lamp illuminates between the M64 Starter Motor B+ terminal 1 X2 or A X2 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 greater than 100 Ω between the B+ circuit and ground.
      • If 100 Ω or less, repair the short to ground on the circuit.
      • If greater than 100 Ω, replace the M64 Starter Motor.
    • If the test lamp illuminates 
  7. Test for less than 0.5 V between the positive battery cable and M64 Starter Motor B+ terminal 1 X2 or A X2 with the ignition in the START position.
    • If 0.5 V or greater 

      Replace the positive battery cable.

    • If less than 0.5 V 
  8. Test for less than 0.5 V between the negative battery cable and the M64 Starter Motor case with the ignition in the START position.
    • If 0.5 V or greater 

      Replace the negative battery cable.

    • less than 0.5 V 
  9. Ignition OFF and all vehicle systems OFF, disconnect the KR27 Starter Relay. It may take up to 2 minutes for all vehicle systems to power down, Ignition ON.
  10. Verify 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 good 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 the 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 
  11. Verify a test lamp illuminates between the ignition circuit terminal 86 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Connect the KR27 Starter Relay and replace the fuse.
    4. Verify the fuse does not open when connecting the KR27 Starter Relay.
      • If the fuse opens, replace the KR27 Starter Relay.
      • If the fuse is OK
    5. All OK
    • If the test lamp illuminates 
  12. Connect a test lamp between ignition circuit terminal 86 and the circuit terminal 85 at the KR27 Starter Relay.
    NOTE:

    If the Starter Relay command is not available in the scan tool, verify the test lamps turns on and off when cycling the ignition between the OFF and CRANK position with the parking brake set and clutch pedal pressed (manual transmission) or the transmission in park (automatic transmission).

    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module and disconnect the harness connector at the T19 Power Supply Transformer, Ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module and disconnect the harness connector at the T19 Power Supply Transformer, Ignition ON.
    2. Test for infinite resistance between the control circuit and ground
    • If less than infinite resistance, repair the short to ground on the circuit
    • If infinite resistance
  13. Reconnect the K20 Engine Control Module
  14. Test for infinite resistance between control circuit and ground.
    • If less than infinite resistance, replace the K20 Engine Control Module.
    • If infinite resistance, replace the T19 Power Supply Transformer
    • If the test lamp turns ON and OFF 
  15. Ignition ON, connect a 30 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  16. Verify the M64 Starter Motor is activated.
    • If the M64 Starter Motor does not activate 
    1. Ignition OFF, 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 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M64 Starter Motor.
    • If the M64 Starter Motor activates 
  17. Test or replace the KR27 Starter Relay.
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