Circuit/System Testing
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
- Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection .
- If contaminated
Clean as necessary.
- Go to next step: If not contaminated
- If contaminated
- Verify the resistance is within the specified range for each solenoid. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection .
- If resistance is not within range
Replace the Q8 Control Solenoid Valve Assembly.
- Go to next step: If resistance is within range
- If resistance is not within range
- Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
- Connect DT-47825-10 jumper harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
- Verify the scan tool parameters listed below do not display Malfunction:
- Shift Solenoid Valve 1 Control Circuit High Voltage Test Status
- Shift Solenoid Valve 1 Control Circuit Open Test Status
- Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status
- If Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.
- Go to next step: If Malfunction is not displayed
- All OK.
NOTE:
You must perform the Circuit/System Verification first.