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

     Refer to Fluid Pressure High or Low .

   • If line pressures are within the specified ranges 
3. Engine Idling, shift selector in the Drive position.
4. Verify the scan tool parameters listed below display the correct state for each gear range while 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 
   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 
5. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

DTC P0776 or P0777 - 3-5-R and 4-5-6 Clutch Housing Assembly 

3-5-R clutch backing plate retaining ring not seated, causing clutch pack over-travel.

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

Fluid pump housing/gear damaged/scored.

DTC P0776 or P0777 - Control Valve Body Assembly

• Actuator feed limit circuit supply fluid to solenoids restricted or not available - debris or sediment blockage.
• 3-5-R Regulator Valve stuck/sticking - debris, binding, damaged valve, or scored bore.
• Control valve body ball check valve not seating correctly - debris.

DTC P0776 - Channel Plate and Spacer Plate 

Oil channels or orifices blocked by debris.

DTC P0776 or P0777 - Q8 Control Solenoid Valve Assembly

• Clutch Pressure Control Solenoid 2 stuck ON/OFF.
• O-ring seals leaking.
• Valve body filter plate assembly cracked, blocked, or damaged gasket seal.