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.
- Engine - Idling
- Verify the scan tool parameter: Battery Voltage = Greater than 11 V
- If 11 V or less
Refer to: Symptoms - Engine Electrical
- Go to next step: If greater than 11 V
- If 11 V or less
- Ignition/Vehicle - Off
- Verify the following conditions do not exist:
- Fuel - Contaminated / Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel Pressure - Low / High - Refer to: Fuel System Diagnosis
.
- If a condition exists
Repair or replace as necessary
- Go to next step: If no condition exists
- If a condition exists
- Disconnect the appropriate electrical connector: K20 Engine Control Module
- 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.
- 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 - Replace the component: Q17 Fuel Injector
- Go to next step: If less than 4 ohms
- All OK.
NOTE: