Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the Q8 Control Solenoid Valve Assembly connector and the K71 Transmission Control Module X2 connector.
Test for infinite resistance between the Transmission Manual/Automatic Date Output circuit terminal 21 and chassis ground.
NOTE:
- When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 GM-Approved Terminal Test Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.
- Testing for steps 2 - 4 is performed on the Q8 Control Solenoid Valve Assembly harness connector using the GY probe J 35616-2A .
- Chassis ground to Battery ground 25 - 35 Ω.
- If less than infinite resistance, repair the short to ground in the circuit.
- If infinite resistance.
Test for infinite resistance between the Transmission Manual/Automatic Data Output circuit terminal 21 and all other terminals of the Q8 Control Solenoid Valve Assembly connector.
- If less than infinite resistance, repair the shorted together condition in the affected circuits.
- If infinite resistance.
Test for less than 10 Ω in the Transmission Manual/Automatic Data Output circuit end to end.
- If 10 Ω or greater
  Repair the open/high resistance in the circuit.
- If less than 10 Ω
Connect all disconnected connectors.
Ignition ON. Engine OFF. Transmission in Park.
Verify that the Transmission Fluid Pressure Switch 3 scan tool parameter displays HIGH.
- If the parameter does NOT display HIGH
  Replace the component: Q8 Control Solenoid Valve Assembly
- If the parameter does display HIGH
Engine ON
While monitoring the Transmission Fluid Pressure Switch 3 parameter, accelerate the vehicle to 60 km/h (37 mph). Maintain that speed for at least 15 s with the Calculated Throttle Position parameter displaying less than 20%.
Verify that the Transmission Fluid Pressure Switch 3 scan tool parameter displays LOW.
- If the parameter does NOT display LOW
  Replace the component: Q8 Control Solenoid Valve Assembly
- If the parameter does display LOW
Using the S3 Transmission Shift Lever, shift the transmission to Drive.
Verify that the Transmission Fluid Pressure Switch 3 scan tool parameter displays LOW.
- If the parameter does NOT display LOW
  Replace the component: Q8 Control Solenoid Valve Assembly
- If the parameter does display LOW
Transmission Manual/Automatic Date Output circuit and Logic/ROM Assembly OK.