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.
- Ignition/Vehicle - Off
- 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.
- Disconnect the electrical connector: X4 @ K20 Engine Control Module
- Test for less than 4 ohms between the test points: Voltage Supply & Voltage Control @ Control module harness
- If 4 ohms or greater
- Disconnect the appropriate electrical connector: Q17 Fuel Injector
- 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
- Replace the component: Q17 Fuel Injector
- 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
- If the DTC sets
- All OK.
NOTE: