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post #16 of 29 Old 02-15-2010, 04:17 PM
ZeeJay1997
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Quote:
Originally Posted by tuckdog74 View Post
no it does not...what does that mean?
It means the ECM is not booting up and doing a lamp check.

Now try unplugging the CPS and see if the CEL works.

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post #17 of 29 Old 02-15-2010, 04:27 PM Thread Starter
tuckdog74
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no it does not come on.
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post #18 of 29 Old 02-16-2010, 04:47 AM
ZeeJay1997
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Quote:
Originally Posted by tuckdog74 View Post
no it does not come on.
if this means you have unplugged the CPS and still no CEL, try unplugging both o2 sensors,

you need to quote what you are responding to.

i really dont like typing.
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post #19 of 29 Old 02-16-2010, 07:13 AM Thread Starter
tuckdog74
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Quote:
Originally Posted by ZeeJay1997 View Post
if this means you have unplugged the CPS and still no CEL, try unplugging both o2 sensors,

you need to quote what you are responding to.

i really dont like typing.
Yes the CEL does not come on. do i leave the CPS unplugged while i unhook the o2 senors?
Thanks...
Sorry for being such a pain.
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post #20 of 29 Old 02-16-2010, 07:33 AM
fidzj
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crank position sensors are notorious for failure on 4.0l jeeps if it is bad it will shuit off the asd relay which controls the fuel pump and spark
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post #21 of 29 Old 02-16-2010, 04:14 PM Thread Starter
tuckdog74
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Quote:
Originally Posted by ZeeJay1997 View Post
if this means you have unplugged the CPS and still no CEL, try unplugging both o2 sensors,

you need to quote what you are responding to.

i really dont like typing.
No light still off with o2 sensor unplugged as well as CPS.
i checked all fuses again to make sure. all are good. i also don't hear the fuel pump.
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post #22 of 29 Old 02-16-2010, 04:20 PM
ZJ5point2GCL
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Quote:
Originally Posted by tuckdog74 View Post
No light still off with o2 sensor unplugged as well as CPS.
i checked all fuses again to make sure. all are good. i also don't hear the fuel pump.
that would still make me think it has todo with the asd circuits, have you probed the relay socket? or bypassed the relay?

98 Deep Slate Niner- 6''s on 35's ---11 F150 Platinum Pearl White- Modded Tiny V6 with Two Turbos. ---93 Black 5.2 limited- Slowly dying in my Parents Driveway
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post #23 of 29 Old 02-16-2010, 04:46 PM
ZeeJay1997
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Quote:
Originally Posted by tuckdog74 View Post
No light still off with o2 sensor unplugged as well as CPS.
i checked all fuses again to make sure. all are good. i also don't hear the fuel pump.
The ECM is dead. The ECM controls the ASD relay ground and the other side is hot from ignition.
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post #24 of 29 Old 02-16-2010, 04:54 PM Thread Starter
tuckdog74
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Quote:
Originally Posted by ZeeJay1997 View Post
The ECM is dead. The ECM controls the ASD relay ground and the other side is hot from ignition.
I just replaced the ECM a month ago. which is the computer right?
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post #25 of 29 Old 02-16-2010, 04:56 PM Thread Starter
tuckdog74
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Quote:
Originally Posted by ZJ5point2GCL View Post
that would still make me think it has todo with the asd circuits, have you probed the relay socket? or bypassed the relay?
no i have not should i. i dont know if i know how to do that even. i there a post that shows how to do it?
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post #26 of 29 Old 02-16-2010, 06:45 PM
ZeeJay1997
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Quote:
Originally Posted by tuckdog74 View Post
I just replaced the ECM a month ago. which is the computer right?
Did you replace it or did a shop do it? Be sure the plug is on good. With the CPS and O2s disconnected you have eliminated the most common source of shorts that kill the ECM. Is it warranted?

The ECM (computer) needs battery voltage, ground, and ignition switch voltage to operate. You need the capacity to check all of these.

Check all fuses in the fuse box under the hood. Be sure the grounds on the block are good.

You'll need a wiring diagram to jump out the ASD relay, Do not try it unless you know exactly what you are doing. You said you replaced it, right?
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post #27 of 29 Old 02-17-2010, 10:57 AM
adamdta1
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i have a 94 zj with the 5.2 in it and it did the same thing...it was the crank position sensor. mine would drive normally till it fully warmed up then would die. then it wouldnt crank afterwards. it would have to sit to cool down then i could start it. its like a $60 part and its located behind the block on the passenger side. havent had any more problems with it.

p.s.
its pretty difficult to get to...ended up taken to the chrysler dealership
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post #28 of 29 Old 02-23-2010, 12:47 PM Thread Starter
tuckdog74
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Quote:
Originally Posted by ZeeJay1997 View Post
Did you replace it or did a shop do it? Be sure the plug is on good. With the CPS and O2s disconnected you have eliminated the most common source of shorts that kill the ECM. Is it warranted?

The ECM (computer) needs battery voltage, ground, and ignition switch voltage to operate. You need the capacity to check all of these.

Check all fuses in the fuse box under the hood. Be sure the grounds on the block are good.

You'll need a wiring diagram to jump out the ASD relay, Do not try it unless you know exactly what you are doing. You said you replaced it, right?
Yes it under warrenty. i am sending it back to the remanufacturers i got it from. yes i installed myself. checked fuses again all are good. i guess i will wait for the new ECM to get back to me. thanks for all of your help. i will keep you posted if it worked or not.
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post #29 of 29 Old 03-02-2010, 04:13 PM Thread Starter
tuckdog74
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Quote:
Originally Posted by tuckdog74 View Post
Yes it under warrenty. i am sending it back to the remanufacturers i got it from. yes i installed myself. checked fuses again all are good. i guess i will wait for the new ECM to get back to me. thanks for all of your help. i will keep you posted if it worked or not.
I got the new rebuilt ECM back from the shop where i bought it...installed it and she fired right up. i am waiting to hear back on what was wrong exactly. Thanks to everyone who helped me figure this out.....especially ZeeJay1997!!!
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grand cherokee , jeep zj , no spark , no start

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