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Re:Re:12 volts on a map sensor on a 96 Jeep 4.0 should it not only be 5 volt
Thanks a bunch for the advice. I have years of off and on mechanical experience and electrical knowledge .just never on this halafax system or a Dodge product . I'm like a baby learning to walk here it seems . I.ve built outlaw cars dirt track cars for years .end to end .. never been so stumped by something so bad.
Slow down on that cutting wires thing cheryl is under the impression you don't have 5v reference from computer and disconnecting sensor or cutting the wire is a way to isolate a bad sensor from pulling the whole 5v reference line down . I believe you are testing incorrect components looking for a 5v reference that wouldn't be there anyways (2 wire sensors will not have a 5v ref). You said it starts and stalls when you supply Power to coil no suprise as the computer might think it's a theft situation . You need to perform testing at the asd relay (I've had bad pcm drivers on the asd relay control bad in these chryslers and I've had wiring issues ) I posted a diagram of the asd relay wiring start there. the ignition switch supplies power to the asd coil (either pin 85 or 86of relay) the computer supplies the ground to the other pin to energize the relay so see if your missing power or ground at the relay. Fuse 8 (60a) supplies power to the ignition switch that goes to relay coil and fuse 20(30a) supplies power for the load side of relay test for power at load side of relay if all is if that is all working then we'll voltage drop test the load side but I suspicion the problem is in control side of asd relay
Wow thanks a bunch for your advice I need all the help I can get at this point .I have voltage on add input .ground on add coil ign, sw, on .new crk. Can sensors signal from CPS. Hot wired coil start stall .jumped add start stall. Switch on ground to add coil power in ,no fuel.pump running .but have 5 volt source to CPS and other components. 1.7 volts on coil feed . Try crank no spark ..then I jumped add terminals but where I think I'm maybe messing up there is I'm going from asd in to asd ground on jumper wire on coil circuit .in other words 85to 86 loop then 30 87 loop on add that starts fuel pump gives spark on coil starts and stalls. That's where I am at this point the only thing I have not put a meter on is the new cam sensor. That's about where I have been other than to check 5 v on injectors tps . Throttle motor .map sensor . So .what am I doing wrong and where to go or start over if you don't mind .reaching out with some good advice . I'd be in debited forever. And fully thankful. .I have to jump off here and go help my little crippled buddy. He had a stroke 8 years ago and lives alone . And i.ve been his rock . And go better since. So it ,ll be around 5:00 before I'm back on or maybe 4:00pm .
Thanks again . Billy ray
One other thing I should mention is the shifter position sensor ..I had to rattle the floor shifter in park to get a start .connection I loosened shifter mounts for cable to replace crank sensor .and now I have to put it in nutural to get start contact plan on getting new shift sensor on way home but this should not cause my start stall problems on no start. ?????
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