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Home >> Chevrolet >> 2015 >> Camaro LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls And Fuel - 6.2L (L99 LS3 LSA) Or 7.0L (LS7) - DTC P0335 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P3400: Cylinder Deactivation System >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, remove the Q43 Valve Lifter Oil Manifold Assembly ignition fuse from the underhood fuse block.
    2. NOTE:

    Probe each terminal at the underhood fuse block with a test lamp connected to ground to determine what terminal to connect the DMM. The test lamp should not illuminate on the circuit that needs to be tested.

  2. Connect a DMM between the ignition circuit fuse terminal going to the Q43 Valve Lifter Oil Manifold Assembly and the K20 Engine Control Module housing.
  3. Ignition ON, command the Cylinder Deactivation System ON and OFF with the scan tool.
  4. Verify the resistance of each cylinder deactivation solenoid valve is between 11-18 Ω with the solenoid valves commanded ON.
    • If greater than 18 Ω for all cylinder deactivation solenoid valves  , test the ignition circuit for an open/high resistance.
    1. Ignition OFF.
    2. Test for less than 2 Ω on the ignition circuit end to end.
    • If greater than 18 Ω for one or more but not all cylinder deactivation solenoid valves 
    1. Ignition OFF.
    2. Test for less than 2 Ω on the appropriate control 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 11-18 Ω between the ignition circuit and the appropriate control circuit at the Q43 Valve Lifter Oil Manifold Assembly.
      • If not within the specified value, test or replace the Q43 Valve Lifter Oil Manifold Assembly.
      • If within the specified value, test or replace the K20 Engine Control Module.
    • If between 11-18 Ω 
  5. Refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing for further mechanical diagnosis of Q43 Valve Lifter Oil Manifold Assembly.
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