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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P05CC or P05CE >> Circuit/System Testing

Circuit/System Testing

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

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: Q6 Camshaft Position Actuator Solenoid Valve
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 2/B & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2/B @ 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 less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Perform the scan tool control function:
    • Exhaust Camshaft Position Actuator - Off
    • Intake Camshaft Position Actuator - Off

      Verify a test lamp does not turn On between the test points: Control circuit terminal 1/A & Ground

    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the 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/A @ Component harness & The other end of the circuit @ Control module harness
      • 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 test lamp does not turn On 
  6. Remove - Test Lamp
  7. Perform the scan tool control function:
    • Exhaust Camshaft Position Actuator - On
    • Intake Camshaft Position Actuator - On
    • Verify the scan tool parameter:
    • Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or Okay
    • Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or Okay
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 1/A @ 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 specified state 
  8. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 1/A & Ground
  9. Perform the scan tool control function:
    • Exhaust Camshaft Position Actuator - On
    • Intake Camshaft Position Actuator - On
    • Verify the scan tool parameter:
    • Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or Okay
    • Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or Okay
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for less than 2 ohms between the test points: Control circuit terminal 1/A @ 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. Ignition/Vehicle - Off
  11. Remove the component: Q6 Camshaft Position Actuator Solenoid Valve
  12. Verify a condition does not exist with the component: Q6 Camshaft Position Actuator Solenoid Valve
    • Engine Oil - Leaking @ Harness Connector
    • Screen - Misaligned/Missing/Restricted/Torn
    • Valve - Scored/Visible Damage
    • If a condition exists 

      Test or replace the component: Q6 Camshaft Position Actuator Solenoid Valve

    • Go to next step: If no condition exists 
    13. NOTE:

    It may be necessary to use jumper wires if the connector indexing is different between the connectors.

  13. Swap the two components:
    • Q6E Camshaft Position Actuator Solenoid Valve - Exhaust
    • Q6F Camshaft Position Actuator Solenoid Valve - Intake
  14. Engine - Running
    15. NOTE:
    • This step is testing the mechanical camshaft position actuator for the camshaft that set the DTC.
    • Perform this test at the original location that set the DTC.
  15. Perform the scan tool control function:
    • Exhaust Camshaft Position Actuator - On
    • Intake Camshaft Position Actuator - On
    • Verify the scan tool parameter:
    • Exhaust Camshaft Position Variance = Less than 2° - During each of the commanded states
    • Intake Camshaft Position Variance = Less than 2° - During each of the commanded states
    • If 2° or greater 

      Replace the component: Camshaft Position Actuator

    • Go to next step: If less than 2° 
  16. Test or replace the component: Q6 Camshaft Position Actuator Solenoid Valve - The original component that set the DTC
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