Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification first.

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.

P0796 or P0797 - Control Valve Upper Body Assembly 

4-5-6 regulator valve stuck/sticking from debris, binding, damaged valve, or scored bore.

P0796 - Channel Plate and Spacer Plate 

Channel Plate and spacer plate oil channels or orifices blocked by debris.

P0796 - Lower Control Valve Body Assembly

• Actuator feed limit circuit supply fluid to solenoid restricted or not available from debris, stuck limit valve, or sediment blockage.
• 4-5-6 clutch boost valve binding or a scored bore which can also cause harsh shifts.
• 4-5-6 clutch accumulator piston leaking, cracked, or broken.

P0796 or P0797 - Input Shaft Support 

Input shaft support 3-5-R and 4-5-6 clutch fluid seal rings damaged, worn, or leaking.

P0796 or P0797 - Q8 Control Solenoid Valve Assembly

• Clutch pressure control solenoid valve 3 stuck ON or stuck OFF.
• Control solenoid filter plate assembly cracked, blocked, or damaged gasket seal.

P0796 - 4-5-6 Clutch Housing Assembly

• 4-5-6 clutch piston assembly damaged or leaking.
• 4-5-6 clutch inner/outer seal damaged.
• Dam pressure too high

P0796 - Automatic Transmission Case Cover 

Blow off regulator ball stuck.

P0796 - Transmission Cooling/Lubrication

• Restriction/leak in oil to air cooler/radiator.
• Restricted/leaking/kinked/damaged transmission oil cooler lines.
• Restriction/leak in transmission fluid pump assembly.

P0796 - Torque Converter Assembly 

Fluid pump or torque converter overstressed due to high temperature of fluid boiled out.

P0796 - 4-5-6 Reaction Carrier Hub Assembly 

4-5-6 reaction carrier hub/shaft - broken hub weld.

P0796 - Automatic Transmission Fluid Filter Assembly 

Oil filter or filter seal loose or damaged

P0796 - Automatic Transmission Fluid Pump 

Pump fluid outlet seal assembly damaged/leaking.