Circuit/System Testing

1. Verify the transmission line pressures are within the specified ranges. Refer to Line Pressure Check .
   • If line pressures are not within range 

     Refer to Fluid Pressure High or Low .

   • If line pressures are within range 
2. Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
3. Verify a pressure change occurs for each solenoid when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
   • If a pressure change does not occur for each solenoid 

     Replace the Q8 Control Solenoid Valve Assembly.

   • If a pressure change does occur for each solenoid 
4. Verify the mechanical conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P0751 or P0752 - Lower Control Valve Body 

Clutch select valve 2 stuck - debris, sediment, binding or scored bore.

P0751 - Upper Control Valve Body 

Bore Plug - Clutch Select Valve 2, Leaking, undersized bore plug, or damaged.

P0751 - Upper Control Valve Body

• Check Ball #2 missing, damaged, or leaking.
• Check Ball #2 Seat damaged or leaking.

P0751 or P0752 - Q8 Control Solenoid Valve Assembly 

Shift Solenoid 1:

• O-ring seals leaking.
• Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal.