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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P02EE-P02F1, P10A3-P10A9, P10AA, P2B00-P2B03, P2B08, P2B09, P2B0A, P2B0B, P2B95, P2B96, or P30D4 >> 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. Ignition/Vehicle - Off
    2. NOTE:
    • For detailed component terminal information, refer to: Engine Controls Wiring Schematics
    • This procedure uses the following circuit names:
      • Voltage Control = Control circuit terminal 1 @ Q17 Fuel Injector
      • Voltage Supply = Control circuit terminal 2 @ Q17 Fuel Injector
    • Perform this diagnostic for the component that set the DTC.
  2. Disconnect the appropriate electrical connector: K20 Engine Control Module
  3. Test for less than 4 ohms between the test points: Voltage Supply & Voltage Control @ Control module harness
    • If 4 ohms or greater 
    1. Disconnect the appropriate electrical connector: Q17 Fuel Injector
    2. Test for less than 2 ohms between the test points:
      • Voltage Control @ Control module harness & The other end of the circuit @ Component harness
      • Voltage Supply @ Control module harness & The other end of the circuit @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: Q17 Fuel Injector
    • Go to next step: If less than 4 ohms 
  4. Replace the component: Q17 Fuel Injector
  5. 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 does not set.

    • If the DTC sets 

      Replace the component: K20 Engine Control Module

    • Go to next step: If the DTC does not set 
  6. All OK.
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