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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Mechanical - 2.7L (L3B) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P06DA-P06DD or P13B1 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  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 & 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 & 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: Ignition circuit terminal 1/A & 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
    5. Disconnect the electrical connector: Q44 Engine Oil Pressure Control Solenoid Valve
    6. Test for infinite resistance between the test points: Ignition circuit terminal 1/A @ Component harness & The other end of the circuit @ X121 Inline Harness Connector
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Ignition circuit terminal 1/A @ Component harness & The other end of the circuit @ X121 Inline Harness Connector
      • 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 test lamp turns On 
  5. Verify a test lamp does not turn On between the test points: Control circuit terminal 4/D & 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 4/D & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Disconnect the electrical connector: Q44 Engine Oil Pressure Control Solenoid Valve
    5. Test for infinite resistance between the test points: Control circuit terminal 2/B @ Component harness & The other end of the circuit @ X121 Inline Harness Connector
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    6. Ignition - On / Vehicle - In Service Mode
    7. Test for less than 1 V between the test points:
      • Control circuit terminal 2/B @ Component harness & Ground
      • Control circuit terminal 4/D @ X121 Inline Harness Connector & 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 test lamp does not turn On 
  6. Test or replace the component: Q44 Engine Oil Pressure Control Solenoid Valve
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