Hello all,

I would like to pick your brain before I go about getting a refurb ECM for my 2002 4runner. I have searched anything I could think of and tried everything I found within my ability, so here goes...

'02 SR5 with 156k miles, new to me. I bought it and was told that the ECM was bad and needed replaced. Symptoms were that car would start and run fine with no engine codes (seemingly normal throttle response and acceleration, but I don't have anything to compare it to). After you shut off the motor, you can turn it back on fine, but the check engine light stays on and the VSC and Trac lights stay on. Engine code is P1633 ECM malfunction (ECTS Circuit). If you "reset" the ECM by pulling a fuse or disconnecting the battery, the codes reset and the car works normally again.

So, I don't think I remember all the things I've checked but they have included: checking for continuity through the ECTS circuit, checking fuses, checking voltage going to ECM of +BM, checking the operation of the TPS, throttle motor, cleaning throttle body, cleaning the MAF sensor, replacing spark plugs and wires...that's all I can remember off the top of my head.

Again, the car works fine the first time it turns on (which makes me think its not a faulty part besides the ECM). Any other suggestions of things to check before dropping $400 in a refurbished unit?

Thanks for the help.