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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 408 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P157A or P16D7-P16D9 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
  3. Test for infinite resistance between the test points: Terminal 16@Component harness & 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: X2 @ K20 Engine Control Module
  5. Test for less than 1 V between the test points: Terminal 16@Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  6. Test for less than 2 ohms between the test points: Terminal 16@Component harness & Control circuit terminal 1@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 
  7. Replace the component: K20 Engine Control Module
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