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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P001A-P001C, P003C, P003D, P005A, P03EC-P03EE, P2B33-P2B35, P3080-P3082, P3085-P3087, P308A-P308C, P308F, P3090, P3091, or P3094-P3096 (Without output control) >> Circuit/System Testing

Circuit/System Testing

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

The actuator pin MUST be retracted prior to installation. Failure to do so will cause damage to the engine.

  1. Ignition/Vehicle & All vehicle systems - Off
    2. NOTE:

    To determine what component to disconnect, refer to: Diagnostic Aids

  2. Disconnect the appropriate electrical connector: M129 Intake Camshaft Profile Actuator
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points: Ignition circuit terminal 5 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: Ignition circuit terminal 5 & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Connect the electrical connector: M129 Intake Camshaft Profile Actuator
    3. Ignition - On / Vehicle - In Service Mode
    4. Replace the component: Fuse
    5. Verify the fuse does not open.
      • If the fuse opens and there are components connected to the circuit - Disconnect a component and repeat procedure starting at step 4.4
      • If the fuse opens with all components disconnected from the circuit - Repair the short to ground on the circuit.
      • If the fuse does not open after disconnecting a component from the circuit - Replace the component disconnected last.
      • Go to next step: If the fuse does not open with all components connected.
    6. Disconnect the electrical connector:
      • M129 Intake Camshaft Profile Actuator - All
      • M130 Exhaust Camshaft Profile Actuator - All
      7. NOTE:

      It may be necessary to use a scan tool control function to operate a component.

    7. Operate the component: Each component on the circuit - One at a time - Exceptions listed below
      • M129 Intake Camshaft Profile Actuator - All
      • M130 Exhaust Camshaft Profile Actuator - All

        Verify the fuse does not open when any of the components are activated.

      • If the fuse opens - Replace the component that caused the fuse to open when activated.
      • Go to next step: If the fuse does not open.
    8. Refer to: Component Testing - Dynamic Test
    • Go to next step: If the test lamp turns On 
  5. Verify a test lamp does not turn On between the test points: Control circuit terminal 1/6 & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 1/6 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp does not turn On 
  6. Ignition/Vehicle - Off & Remove - Test lamp
  7. Disconnect the appropriate electrical connector: K20 Engine Control Module
  8. Ignition - On / Vehicle - In Service Mode
  9. Test for less than 1 V between the test points: Control circuit terminal 1/6 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  10. Test for less than 2 ohms between the test points: Control circuit terminal 1/6 @ Component harness & The other end of the circuit @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  11. Ignition/Vehicle - Off
  12. Disconnect the electrical connector:
    • M129 Intake Camshaft Profile Actuator - All
    • M130 Exhaust Camshaft Profile Actuator - All
  13. Remove the appropriate component: M129 Intake Camshaft Profile Actuator
  14. Connect a 5 A fused jumper wire between the test points: Ignition terminal 5 & 12 V
    15. CAUTION:

    Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

  16. Momentarily connect a jumper wire between the test points:
    • Control terminal 1 & Ground
    • Control terminal 6 & Ground

      Verify the component turns On and Off or the fuse does not open when connecting and disconnecting the jumper wire: M129 Intake Camshaft Profile Actuator

    • If the component does not turn On and Off or The fuse opens 

      Replace the component: M129 Intake Camshaft Profile Actuator

    • Go to next step: If the component turns On and Off & The fuse does not open 
  17. Replace the component: K20 Engine Control Module
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