No power to my fuel pump fuse?
#21
ECMs of this vintage frequently have leaking capacitors that can cause a bevy of unpredictable problems
Disconnect the battery first.
#23
#24
Check all the fuses to the ECU and instrument cluster.
With no OBDII, I am starting suspect the internal High Speed network is down.
Do you have an oscilloscope by any chance? Without any history, and with no OBDII to go on, it is a guessing game unless you start looking at signals. The most likely suspects are the instrument cluster and ECU.
The instrument cluster computer is the hub of all communication in the car, and it has a habit of failing from jump starts with a dead or missing battery, so it is also a prime suspect.
#25
#26
is there are visualy obvious clue to a short if I were to remove the cluster? I'm kind of thinking I may go ahead and get this one rebuilt.. the car does do some weird stuff... can't shift out of park (started after reconnectiong the battery) the rear windows go down by themselves. The battery goes dead in a couple days... and here's the kicker... it is impossible to connect the battery without sparking, so there is a dead short somewhere. I did install a battery cut off switch to minimize this. Without the car running I have to charge the battery often to minimize the sparking.
#27
is there are visually obvious clue to a short if I were to remove the cluster? I'm kind of thinking I may go ahead and get this one rebuilt.. the car does do some weird stuff... can't shift out of park (started after reconnecting the battery) the rear windows go down by themselves. The battery goes dead in a couple days... and here's the kicker... it is impossible to connect the battery without sparking, so there is a dead short somewhere. I did install a battery cut off switch to minimize this. Without the car running I have to charge the battery often to minimize the sparking.
A problem in the cluster is still just an educated guess though..there could be other issues.
#28
#29
#31
I hope it at the very least restores OBDII operation, that will be a big plus for diagnosis. Disconnect the battery before unplugging the old one and plugging in the new one.
#33
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