I have a intermittent transmission shifting problem. The arrow lamp on the dash will come on and glow at different levels of brightness when this problem is occuring. I will sometimes get a 131 code on the A1 socket. At times when connecting the pin in the A1 socket the red led will glow at different brightness and will stay on without pushing the button to turn the lamp on. I have replaced the 4.3 ecu. The transmission was replaced around 17,000 miles ago. Took the car to a good transmission shop they cannot find anything wrong with the transmission. They think is a wiring problem. I have the volvo wiring diagram and have traced most of the wiring out and have found know problems. I NEED HELP!!!!!!
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