Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification first.

1. Verify the transmission line pressures are within range. Refer to Line Pressure Check , and Solenoid Valve Pressure (Gen 1) .
   • If line pressures are not within the specified ranges 

     Refer to Fluid Pressure High or Low .

   • If line pressures are within the specified ranges 
2. Engine Idling, shift selector in the Drive position.
3. Verify the scan tool parameters listed below display the correct state for each gear range while commanding the scan tool Shift Transmission Gear through all forward ranges. Refer to Transmission Fluid Pressure Switch Logic for the correct gear range states.
   • TFP Switch 1
   • TFP Switch 3
   • TFP Switch 4
   • TFP Switch 5
   • If the correct state for each gear range is not displayed 

     Replace the Q8 control solenoid valve assembly.

   1. Ignition OFF.
   2. Remove the Control Valve Body. Refer to Control Valve Body Replacement .
   3. Verify the Control Valve Body is not contaminated with any debris and there is no damage or sticking valves, refer to Control Valve Body Cleaning and Inspection (Gen 2) .
      • If there is contamination, damage, or sticking valves, repair or replace the control valve body as necessary.
      • If there is no contamination, damage, or sticking valves, replace the Q8 Control Solenoid Valve Assembly.
   • If the correct state for each gear range is displayed 
4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P2723 - Automatic Transmission Fluid Filter Assembly  

Oil filter or filter seal loose or damaged.

P2723 - Torque Converter (w/Fluid Pump) Housing Assembly

• Fluid pump housing/gear damaged/scored.
• Fluid pump or torque converter overstressed due to high temperatures.

P2723 - Trans Case and 1-2-3-4 Clutch Backing Plate Retaining Ring 

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

P2723 - Output Sun Gear Assembly 

Housing/hub weld cracked/leaking.

P2723 - Lo and Reverse and 1-2-3-4 Clutch Housing Assembly (51) 

1-2-3-4 clutch piston (414) cracked/damaged/leaking.

P2723 - Channel Plate and Spacer Plate 

Oil channels or orifices blocked by debris.

P2723 or P2724 - Control Valve Body Assembly 

1-2-3-4 clutch regulator valve stuck/sticking - debris, binding, damaged valve, or scored bore.

P2723 or P2724 - Q8 Control Solenoid Valve Assembly (314)

• Pressure Control Solenoid Valve 5 Stuck ON/OFF.
• O-ring seals leaking.
• Valve body filter plate assembly cracked, blocked, or damage gasket seal.