Circuit/System Testing

Engine idling at the normal operating temperature.
NOTE: You must perform Circuit/System Verification first.
Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check and Solenoid Valve Pressure (Gen 2) .
- If the pressures are not within range
  Refer to Fluid Pressure High or Low .
- If the pressures are within range
Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
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
Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.

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 - 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 - Channel Plate and Spacer Plate

Oil channels or orifices blocked by debris.

DTC P0776 or P0777 - Q8 Control Solenoid Valve Assembly