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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 122 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P30BE, P30BF, P30C2, P30C3, P30C6, P30C7, P30CA, or P30CB >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine - Running
  2. Verify there is no abnormal noise from the component: Engine
    • Go to next step: If no abnormal noise is present 
    3. 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.

  3. Ignition/Vehicle & All vehicle systems - Off
  4. Disconnect the appropriate electrical connector:
    • B338 Intake Camshaft Profile Sleeve Position Sensor
    • B339 Exhaust Camshaft Profile Sleeve Position Sensor
  5. Test for less than 10 ohms between the test points: Low Reference circuit terminal 2 & Ground
    • If 10 ohms or greater 
    1. Disconnect the appropriate electrical connector: K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2 @ 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 
  6. Ignition - On / Vehicle - In Service Mode
  7. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal 1 @ 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
    • If greater than 5.2 V 
    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: 5 V Reference circuit terminal 1 @ 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 between 4.8 and 5.2 V 
  8. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 3 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 3 @ 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
    • If greater than 5.2 V 
    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: Signal circuit terminal 3 @ 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 between 4.8 and 5.2 V 
  9. Verify DTC P30BF, P30C3, P30C7, P30CB is not set.
    • If any of the DTCs are set 
    1. Ignition/Vehicle - Off
    2. Verify the following conditions do not exist:
      • B338 Intake Camshaft Profile Sleeve Position Sensor or B339 Exhaust Camshaft Profile Sleeve Position Sensor - Foreign material passing between the components /Incorrect air gap/Incorrect installation/Loose/Visible Damage
      • Camshaft profile sleeve - Visible Damage
      • Reluctor Ring - Visible Damage
      • Retention spring/ball @ Camshaft profile sleeve - Missing/Visible Damage
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Replace the component: B338 Intake Camshaft Profile Sleeve Position Sensor or B339 Exhaust Camshaft Profile Sleeve Position Sensor
    • Go to next step: If none of the DTCs are set 
  10. Swap the two components: B338 Intake Camshaft Profile Sleeve Position Sensor or B339 Exhaust Camshaft Profile Sleeve Position Sensor - The original component that set the DTC & Another known good component from the vehicle
  11. Clear the DTCs.
  12. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC sets at the original component location.

    • If the DTC does not set at the original component location 

      Test or replace the component: B338 Intake Camshaft Profile Sleeve Position Sensor or B339 Exhaust Camshaft Profile Sleeve Position Sensor - The original component that set the DTC

    • Go to next step: If the DTC sets at the original component location 
  13. Replace the component: K20 Engine Control Module
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