Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. 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
All OK.