Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Engine - Running
- Verify the scan tool parameter :
- Ignition Coil 1-8 Control Circuit High Voltage Test Status = OK or Not Run
- Ignition Coil 1-8 Control Circuit Low Voltage Test Status = OK or Not Run
- Ignition Coil 1-8 Control Circuit Open Test Status = OK or Not Run
- If not the specified state
Refer to Circuit/System Testing below.
- Go to next step : If the specified state
- Verify the scan tool parameter :
- Ignition Coil 1-8 Control Circuit High Voltage Test Status = OK or Not Run
- Ignition Coil 1-8 Control Circuit Low Voltage Test Status = OK or Not Run
- Ignition Coil 1-8 Control Circuit Open Test Status = OK or Not Run
- Perform the action while monitoring the parameter :
- Wiggle the harness and connector : T8 Ignition Coil
- Wiggle the harness and connector : K20 Engine Control Module
- If not the specified state
Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)
- Go to next step : If the specified state
- 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
Refer to Circuit/System Testing below
- Go to next step : If the DTC is not set
- If the DTC sets
- All OK.