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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 P2146 or P2149: Injector High Control Circuit Group >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
WARNING:

Before working on any high voltage fuel injection system, be aware of the following procedures:

  • Do not make contact with the fuel injection harness, engine control module (ECM) or fuel injectors while the ignition is ON or RUN positions.
  • Wait 5 minutes after key OFF to allow the electronic control module (ECM) to discharge before attempting to disconnect or test engine control components.
  • Do not use the electronic control module (ECM) case as a ground while jump starting.

Failure to follow the procedure exactly as written may result in serious injury or death.

NOTE:

The following diagnostics must be performed to each injector in the group that the DTC was set.

  • Group 1-DTC P2146 with injectors 1 and 4
  • Group 2-DTC P2149 with injectors 2 and 3
  1. Ignition OFF.
  2. Disconnect the appropriate harness connectors at each of the Q17 Fuel Injectors in the group that the DTC set.
  3. Ignition ON.
  4. Test for less than 1 V between the appropriate Fuel Injector High Voltage Supply circuit terminal 2 and ground.
    • If greater than 1 V 

      Repair the short to voltage in the appropriate Fuel Injector High Voltage Supply circuit.

    • If less than 1 V 
  5. Ignition OFF.
  6. Disconnect the harness connectors at the K20 Engine Control Module.
  7. Test for 0.0 V between the appropriate Fuel Injector High Voltage Supply circuit terminal 2 and B+.
    • If greater than 0.0 V 

      Repair the short to ground in the appropriate Fuel Injector High Voltage Supply circuit.

    • If less than or equal to 0.0 V 
  8. Test for 0.0 V between the appropriate Fuel Injector High Voltage Control circuit terminal 1 and B+.
    • If greater than 0.0 V 

      Repair the short to ground in the appropriate Fuel Injector High Voltage Control circuit.

    • If less than or equal to 0.0 V 
  9. Test for 150K-210K Ω between terminal 1 and terminal 2 of the appropriate Q17 Fuel Injector.
    • If the not between 150K-210K Ω 

      Replace the appropriate Q17 Fuel Injector.

    • If between 150K-210K Ω 
  10. Test for infinite resistance between each terminal and the Q17 Fuel Injector housing/case.
    • If not infinite resistance 

      Replace the Q17 Fuel Injector.

    • If infinite resistance 
  11. Replace the K20 Engine Control Module.
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