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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0430 To DTC P2080) >> Diagnostic Information and Procedures >> DTC P12B0 or P12B1: Intake Manifold Runner Control Valve Feedback Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition Off and all vehicle systems Off, disconnect the harness connector at the M98 Intake Manifold Runner Valve Actuator. It may take up to 2 min for all vehicle systems to power down.
    NOTE: It may be necessary to remove the positive crankcase ventilation oil separator to access the M98 Intake Manifold Runner Valve Actuator harness connector. Refer to Repair Instructions .
  2. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition Off.
    2. Test for less than 2 Ω in the circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition On
  4. Verify test lamp illuminates between ignition circuit terminal 3 and ground.
    • If the test lamp does not illuminate and circuit fuse is good 
    1. Ignition Off, remove 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, 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, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      NOTE: An internal short in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test all components connected to the ignition voltage circuit for a short and replace as necessary.
    • If the test lamp illuminates 
  5. Reconnect the harness connector at the M98 Intake Manifold Runner Valve Actuator.
  6. Ignition On.
  7. Verify the scan tool Intake Manifold Runner Control Valve Position parameter does not display Open.
    • If the parameter displays Open 
    1. Ignition Off, disconnect the harness connector at the M98 Intake Manifold Runner Valve Actuator. Ignition On.
    2. Test for greater than 10 V between the signal circuit terminal 1 and ground.
      • If less than 10 V
      1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
      2. Test for infinite resistance between the signal circuit 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 signal 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 greater than 10 V
      1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Ignition On.
      2. Test for less than 1 V between the signal circuit and ground.
        • If 1 V or greater, repair the short to voltage on the circuit.
        • If less than 1 V, replace the K20 Engine Control Module.
    • If parameter does not display Open 
  8. Replace the M98 Intake Manifold Runner Valve Actuator.
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