Circuit/System Testing

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

     Refer to Fluid Pressure High or Low .

   • Go to next step: If 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 

     Replace the Q8 Control Solenoid Valve Assembly.

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

P0756 - Lower Control Valve Body (351) 

Clutch select valve 3 stuck off - debris, sediment, binding or scored bore.

P0756 - Lower Control Valve Body (351) 

Bore Plug - Clutch Select Valve 3 leaking, undersized bore plug, damaged.

P0756 - Upper Control Valve Body (304)

• Check Ball #3 missing, damaged, leaking.
• Check Ball #3 Spacer plate seat damaged, leaking.

P0756 - Q8 Control Solenoid Valve Assembly (314) 

Shift Solenoid (SS) 2:

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

P0756 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) 

1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over travel and cut the 1-2-3-4 clutch piston seal.

P0756 - Fluid Pump Cover Assembly 

Fluid pump cover vanes and fluid pump rotor broken.

P0756 - Low Clutch Sprag Assembly 

Broken or incapable of holding torque.

P0756 - Pump Seal 

Seal is cut, torn causing a leak due to pump speed and capacity.