Grounded battery while car was running, suspect the engine comtrol module is fried. Sound right? If so, where's the ECM located on an 89 Wrangler?
It's likly you did alot of damage. First with a well charged and correctly installed battery it's best to cheal some other things first. The large fuses near the battery( fuseable links) need to be checked to see that their connected. Use a test light to test all of them. ( a test light is a tool that has a bulb in the handle of a tllt that lloks like a clear ice pick and has a wire coming out the end oif the handle. on the end of the wire is a clip to connect to ground ( the negative post on the battry) and as you touch the piont to the positive post of the battery ( or anythign powered) the light will light in the handle showing you that the power is getting to there) The test light should be as bright as the connection at the batery was or you have detrcted a poor connection if the light is'nt as bright as the battery was. Going though all the wires coming from the battery ( theirs alot) repair any that are dead. Then go to the fuse box and do the same thing. Use the test light as a blown fuse can (look ) good and be bad. on the tops of the fuses theirs a little bare place on the fuse and just touch the test light and if lights up on both sides it's good .. If it lights on one side it's bad it it does'nt light at all it may not be on. ( key on or lights on or key turned to crank may need to happen for somes fuses to light the test light) If one side of the fuse lights the light the other side sould light too. If all the fuses check good and the jeep cranks but does'nt run you still need to check it just like any no start car. If it does'nt crank fix that first. Once cranking see that it's got spark. ( plug a plug wire and connect it to a spare plug laying on the head and chank the engine to see if theirs spark. With spark them cheak to see if it'll run with added fuel. Remove the air inlet hose on the throttle body slose a little gas it their and put the hose back on and crank it and if it starts you know it'll runn if it was getting fuel. Cheaking for fuel pump operation is next and the fuse from the pump can be on the fire wall on the passenger side. get under the jeep and put your ear against the gas tank and listen as someone turns the key one and if you hear the fuel pump come on you can say the pump works if not you need to find the fuel pump fuse and the realy that turns the pump on as this short to powercan back feed and blw relays and fuses. Most of the time theingtion module can blown on a back feed and the computer can too but the fuse often protects the computer. The computer is the box ( small cerial box size on the firewall on the passenger side) This part has to be programmed to work so a used one is no help as an old computer can'nt be reprogrammed ( to pervent thief) so a new computer has to be bought and programmed to match your car ( this is best left to a professional shop) I've even had other professional shops come to me to do this work cause you only get one chance at it and the other things i just told you about are much more likly to happen then computer failure and if the computer did fail some of these other problems have happened too and they'll need to be found.. iF THE FUSEABLE LINKS HAVE BEEN REPAIRED OR REPLACED IN THE PAST THEY CAN CAUSE THE COMPUTER TO FAIL AS THEY MIGHT NOT BLOW AND BLOW THE COMPUTER INSTAED.
Jul 11, 2011 |
1989 Jeep Wrangler