Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification first.

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 .

   • 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.

   • 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.

P0776 - Control Valve Upper Body Assembly (304) 

3-5-R Regulator Valve (336) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 - Control Valve Upper Body Assembly (304) 

B-2-6 Regulator Valve (334) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 or P0777 - Q8 Control Solenoid Valve Assembly (314)

• O-ring seals leaking.
• Valve body filter plate assembly cracked, blocked or damaged gasket seal.

P0776 or P0777 - Control Valve Upper Body Assembly (304)

• Actuator feed limit circuit supply fluid to solenoids restricted or not available, debris or sediment blockage.
• B-R-1/4-5-6 clutch regulator valve (327) not in the applied position - debris, binding, damaged valve, or scored bore.
• 4-5-6 clutch boost valve (329) not exhausting - debris, binding, damaged valve, or scored bore.

P0776 or P0777 - Torque Converter (w/Fluid Pump) Housing Assembly (2) 

Fluid pump housing vanes/rotor/slide damaged/scored.

P0776 or P0777 - A/Trans Fluid Pump Cover Assembly (219) 

Isolator valve (236) stuck/sticking - debris, binding, damaged valve, or scored bore.

P0776 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) 

3-5-R clutch backing plate retaining ring (400) not seated.

P0776 or P0777 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) 

1-2-3-4 clutch backing plate retaining ring (429) not seated, causing clutch pack/piston over travel.

P0776 - 4-5-6 Hub/ Shaft Assembly (58) 

4-5-6 Hub/Shaft - broken hub weld.