Circuit/System Testing

1. Engine idling at the normal operating temperature.
2. Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check (Non Hybrid) , 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 
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.

P0741 Upper Valve Body 

Release exhaust port/orifice plugged or blocked.

P0741 or P0742 - Upper Valve Body 

Torque converter clutch regulator valve stuck/sticking - debris, binding, damaged valve, or scored bore.

P0741 - Channel Plate and Spacer Plate 

Oil channels or orifices blocked by debris.

P0741 or P0742 - Fluid Pump Assembly 

Torque converter clutch control valve stuck/sticking - debris, binding, damaged valve, or scored bore.

P0741 - Torque Converter

• Torque converter clutch delamination or material worn off.
• Converter bolts too long damaging the clutch apply surface.
• Damaged seal.

P0741 - Support 

Damaged seal.

P0741 or P0742 - A/Trans Case Cover (403)

• Pressure release blow-off not seating/sealing.
• Damaged spring.

P0741 - Turbine Shaft O-ring Seal 

Cut or damaged.

P0741 or P0742 - Q8 Control Solenoid Valve Assembly

• Torque converter clutch pressure control solenoid stuck OFF or leaking.
• Torque converter clutch pressure control solenoid stuck ON.
• Control signal fluid supply leak due to valve body filter plate assembly cracked, or damaged gasket seal.