Circuit/System Testing

Engine idling at the normal operating temperature.
Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check , and Solenoid Valve Pressure .
- If the pressures are not within range
  Refer to Fluid Pressure High or Low .
- If the pressures are within range
Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
Verify the pressure changes for all solenoids when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
- If the pressure does not change
  Replace the Q8 Control Solenoid Valve Assembly.
- If the pressure changes
Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.

Upper Control Valve Body

Clutch select valve 3 stuck from debris, sediment, binding or scored bore
Clutch select valve 3 bore plug undersized causing a leak - plug should be a valve fit in the bore.
Check ball #3 - missing, damaged or malformed, or damage to the seat causing leakage.
Check ball #1 - missing, damaged or malformed, or damage to the seat causing leakage.

Channel Plate and Spacer Plate

Oil channels or orifices blocked by debris.

Mechanical Diode

Broken or not capable of holding torque.

Pump Assembly

Fluid pump vanes or fluid pump rotor broken

Pump Seal

Seal is torn or cut, causing a small leak that is overcome with enough speed and pump capacity.

Q8 Control Solenoid Valve Assembly