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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P002A-P002C, P03F1-P03F3, P2B39-P2B3B, or P3099-P309B >> 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: M130 Exhaust 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: M130 Exhaust 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. Remove - Test Lamp
  7. Perform the scan tool control function: Exhaust Camshaft Position Actuator - On

    Verify the scan tool parameter: Exhaust Camshaft Profile Actuator 1 - 4 Control Circuit High Voltage Test Status = OK

    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. 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.
      • If less than 1 V - Replace the component: K20 Engine Control Module
    • Go to next step: If the specified state 
  8. Connect a 5 A fused jumper wire between the test points: Control circuit terminal 1/6 & Ignition circuit terminal 5
  9. Perform the scan tool control function: Exhaust Camshaft Position Actuator - On

    Verify the scan tool parameter: Exhaust Camshaft Profile Actuator 1 - 4 Control Circuit High Voltage Test Status = Malfunction

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. 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.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If the specified state 
  10. Test or replace the component: M130 Exhaust Camshaft Profile Actuator
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