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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 3.0L (LGY)) >> Diagnostic Information and Procedures >> DTC P06DA-P06DD or P13B1 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X121 Inline Harness Connector
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points: Ignition circuit terminal 1/A @ X121 Inline Harness Connector & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Ignition circuit terminal 1/A @ X121 Inline Harness Connector & 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 Ω between the test points: Ignition circuit terminal 1/A @ X121 Inline Harness Connector & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K20 Engine Control Module
    • 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 2/B @ X121 Inline Harness Connector & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 2/B @ X121 Inline Harness Connector & 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. Disconnect the electrical connector: K20 Engine Control Module
  7. Test for less than 1 V between the test points: Control circuit terminal 2/B @ X121 Inline Harness Connector & The other end of the circuit @ Control module harness
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  8. Test for less than 2 Ω between the test points: Control circuit terminal 2/B @ X121 Inline Harness Connector & The other end of the circuit @ Control module harness
    • If greater than 2 Ω 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  9. Connect all electrical connectors.
  10. Disconnect the electrical connector: Q44 Engine Oil Pressure Control Solenoid Valve - Refer to Oil Pump Flow Control Solenoid Valve Replacement
  11. Ignition - On / Vehicle - In Service Mode
  12. Verify a test lamp turns On between the test points: Ignition circuit terminal 1/A & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Ignition circuit terminal 1/A @ Q44 Engine Oil Pressure Control Solenoid Valve & 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 Ω between the test points: Ignition circuit terminal 1/A & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp turns On 
  13. Verify a test lamp does not turn On between the test points: Control circuit terminal 2/B & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 2/B & 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 
  14. Disconnect the electrical connector: K20 Engine Control Module
  15. Test for less than 1 V between the test points: Control circuit terminal 2/B @ Q44 Engine Oil Pressure Control Solenoid Valve & The other end of the circuit @ Control module harness
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  16. Test for less than 2 Ω between the test points: Control circuit terminal 2/B @ Q44 Engine Oil Pressure Control Solenoid Valve & The other end of the circuit @ Control module harness
    • If greater than 2 Ω 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  17. Test or replace the component: Q44 Engine Oil Pressure Control Solenoid Valve
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