03 computer
Thread Starter
|
Registered User
Joined: Aug 2011
Posts: 1
Likes: 0
03 computer
hello i am new here. i have a 2003 caravan 3.8. the other day was driving it when it just shut down. tryed to start sometimes it would crank over but sometime nothing. when i turn the key off there was something on the throtle body clicking. only way to stop that from clicking was to unhook batt. tryed for 20 min then had smoke coming from computer.. help
Record Breaker
Joined: Feb 2011
Posts: 2,256
Likes: 2
From: SoCal
Talk about going from bad to way worse. I'll assume the computer that was smoking was the Powertrain Control Module (PCM) near the battery. The component clicking on the throttle body was either the Idle Air Control (IAC) valve/motor or the Throttle Position Sensor (TPS). The TPS is above the IAC. Are you sure when you hooked the battery back up you got the + on the + and the - on the -? That boobo can fry electronics.
What to do? The smoke changes everything. First verify it's the PCM, you'll need a new one. Then you have to figure out way it fried before you install the new one. That's the tough one. First, using a multimeter, verify power and grounds to the computer aren't shorted. Next, I would do a detailed visual inspection on every connection and wire harness under the hood looking for melted worn insulation and bare wire. Problem spots are harnesses routed near the exhaust and intake manifolds, under the engine near the transmission, and under the battery tray. Might consider changing whatever was clicking.
If you want to cross your fingers and press on, that is if the PCM cooperates, one common reason the engine just shuts down is a crankshaft sensor fails. Others are the fuel pump or ignition coil dies.
What to do? The smoke changes everything. First verify it's the PCM, you'll need a new one. Then you have to figure out way it fried before you install the new one. That's the tough one. First, using a multimeter, verify power and grounds to the computer aren't shorted. Next, I would do a detailed visual inspection on every connection and wire harness under the hood looking for melted worn insulation and bare wire. Problem spots are harnesses routed near the exhaust and intake manifolds, under the engine near the transmission, and under the battery tray. Might consider changing whatever was clicking.
If you want to cross your fingers and press on, that is if the PCM cooperates, one common reason the engine just shuts down is a crankshaft sensor fails. Others are the fuel pump or ignition coil dies.
Last edited by Cougar41; Aug 21, 2011 at 01:21 PM.
Welcome to DF
I agree with cougar41 you need to find out what cause the controller to fry, Before you install another controller. With the old controller, try to communicate with it and see if there any codes. If you can't communicate with the controller, then its dead.
I agree with cougar41 you need to find out what cause the controller to fry, Before you install another controller. With the old controller, try to communicate with it and see if there any codes. If you can't communicate with the controller, then its dead.