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Plugged a TCM from 2004 9-5 (part number 5590534) into the 2003 Linear and it cleared the P0748 and has been shifting fine for the last two days. My guess is a cracked solder joint or circuit board component that fails at operating temperature. When time permits I'll do a teardown of the flawed TCU to verify.
One correction from earlier post: the current draw (and PWM duty cycle) are highest for the SLT linear solenoid during idle - about 1 amp.
tim
posted by 73.165.193...
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