What is a part throttle unlock relay?
What is a part throttle unlock relay? The Part-Throttle Unlock Relay appears to drive the Part Throttle Unlock Solenoid mounted on your automatic transmission. I believe this is to release the lockup torque convertor. What is a PTU solenoid? The PTU solenoid is designed to unlock the torque converter during part throttle acceleration, meaning harder than normal driving and less than full kickdown. The PTU is controlled via the spark control computer, in a stock 3.9 ltr based on feed back from various sensors. Where is the fuel pump relay located in a car? You can try to listen closer...