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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P2122 To DTC P2689 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2510: Engine Controls Ignition Relay Feedback >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, disconnect the KR75 Engine Controls Ignition Relay.
  2. Verify a test lamp illuminates between ground and the B+ terminals listed below:
    • Terminal 2
    • Terminal 3
    • If the test lamp does not illuminate 

      Replace the front compartment fuse block.

    • If the test lamp illuminates 
  3. Ignition ON.
  4. Verify that a test lamp does not illuminate between ground and ignition voltage circuit terminal 5.
    NOTE: A short to voltage on any of the circuits supplied by the engine controls ignition relay can cause P2510 to set.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Ignition ON.
    3. Test for less than 1 V at connector terminal 1.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  5. Ignition OFF, connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 3 and the relay switch ignition voltage circuit terminal 5.
  6. Ignition ON.
  7. Verify the scan tool Engine Controls Ignition Relay Feedback Signal parameter displays B+.
    • If B+ is not displayed 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the relay switch ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Test for infinite resistance between the relay switch ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If B+ is displayed 
  8. Ignition OFF, connect a DMM set to the diode setting between control circuit terminal 1 and ground.
  9. Verify the DMM displays OL.
    • If OL is not displayed 
    1. Disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If OL is displayed 
  10. Ignition ON.
  11. Verify the DMM displays less than 1 V.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Ignition ON.
    3. Test for less than 1 V on the relay control circuit.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    4. Test for less than 2 Ω on the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 1 V 
  12. Test or replace the KR75 Engine Controls Ignition Relay.
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