Hello,
I have a 93 SSEi that had been sitting for a couple of months waiting for me to get a new tranny for it. Went to start it the other day and as soon as I turned the key, smoke started pouring out from the passenger footwell. I have just been out taking it apart and found that the middle connector to the PCM has 1/2 melted (both harness and connector). I pulled the PCM out and undid the cover and found a VERY nasty scorch mark / burn running from the middle connector across the board. Obviously I will need a new PCM, however I was hoping someone coould provide me with info as to what sensors/outputs that middle connector is for since it would seem that something on the engine side of this connector caused a short (possibly?)

I only have the books for my 94 SSEi and the computers are totally different between the two years. Any help would be appreciated

Thanks

How many pins and what color? The FSM doesn't list them out by ends or middle. It'* either a black 32 pin, A black 24 pin, or a green 32 pin.

It is the 24pin connector although on mine this connector has a blue snap lock and black body (what'* left of it)

Thanks for your help

A1 spare
A2 pnk/blk ignition input
A3 spare
A4 orange battery input
A5 Purple Brakes applied input
A6 Blk/White Groound
A7 Blk/White sensor return
A8 Black Sensor return
A9 Light blue/black servo position sensor input low (cruise?)
A10 Tan Servoe position sensor input High
A11 spare
A12 Black camshaft reference input
B1 spare
B2 spare
B3 Grey 5 volt reference (probably for sensors?)
B4 Orange battery input
B5 spare
B6 black/white ground
B7 Tan intake air temp sensor input
B8 Dark blue knock sensor input
B9 Yellow Engine coolant temp sensor input
B10 Dark blue throttle position sensor input
B11 white/black diagnostic request (ALDL connector pin?)
B12 spare

Ignore anything sensor related. Ignore grounds. Your primary concerns are the major feeds, so your alternator is a potential suspect unless the fault originated inside the PCM (dead short to ground on a primary feed).

Any blown fuses?

Your SAFEST alternative now is to replace the battery and alternator as a PAIR before you install the new PCM.

Thanks for the info, I am just heading out to the shop to begin cleaning up the mess now. haven't checked fuses yet but will let you know, I'm still not sure what caused this but will post my findings here.

regards

Paul

1993 PCM