Circuit/System Testing

1. Engine idling at the normal operating temperature.
2. 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 
3. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
4. 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 
5. Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.

P0751 - Upper Control Valve Body

• Clutch select Valve 2 bore plug undersized causing a leak - plug should be a valve fit in the bore.
• Check ball #2 - missing, damaged or malformed, or damage to the seat causing leakage.

P0751 or P0752 - Upper Control Valve Body 

Clutch select Valve 2 stuck from debris, sediment, binding, or a scored bore.

P0751 or P0752 - Channel Plate and Spacer Plate 

Oil channels or orifices blocked by debris.

P0751 - Lower Control Valve Body

• Shift solenoid 1 - not pressurizing, stuck OFF or leaking.
• Shift solenoid 1 - not exhausting, stuck ON.

P0751 or P0752 - Q8 Control Solenoid Valve Assembly

• Shift solenoid valve 1 stuck OFF or leaking.
• Shift solenoid valve 1 stuck ON.
• Valve body filter plate assembly cracked, blocked, or damaged gasket seal.
• Pressure control solenoid valve 3 stuck ON, stuck OFF, or leaking. Low and Reverse, and 4-5-6 regulator valve stuck or sticking from debris, sediment, binding or scored bore.