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Unread 06-05-2007, 08:31 PM   #1
Rollin
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Cps

My friend has a 99 Cherokee sport 4.0l that will not start. it cranks and cranks but it wont start. It threw code 23 which is the crankshaft position sensor. So we went down to the autoparts store and $100 later we have a new crankshaft sensor in the jeep. Same problem. We cleared the codes in the ecu by unplugging the battery for 15 minutes but everytime the ignition is turned on, it throws the same code.

We checked the plugs and sure enough, no spark. There is fuel and the battery still has enough juice to turn the engine over, but there is no spark on any of the plugs. Does this mean the cap or rotor just coincidentally died at the same time as the CPS or could it mean that because the ECU isnt getting a signal from the CPS, it wont send a signal to the distributor to spark at the plugs? Is there anything that we could have missed?

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Unread 06-05-2007, 09:32 PM   #2
curtjames37
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I would check the wiring to the CPS if you haven't already. What specifically did the code say?
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Unread 06-05-2007, 09:39 PM   #3
coppertop71
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I agree check the CPS wiring to see if it burned on the exhaust.

If that appears fine I know my 1990 has a ignition control module under the coil that should control the coils spark. The coil pops into it with prongs maybe theres a bad connection there.
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Unread 06-05-2007, 09:41 PM   #4
curtjames37
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I think the ignition control module on the 99 is in the PCM. I know it is not right there with the coil. Someone correct me if I'm wrong.
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Unread 06-05-2007, 10:17 PM   #5
jv3kxj
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It is possible that he got a bum cps. You might wanna test the cps to be sure.
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Unread 06-05-2007, 11:13 PM   #6
BrunoS
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1) check ASD relay.

2) could be the Hall effect sensor inside distributor. it's the CKP sensor.

3) also check fuel delivery (sniff exhaust...should smell like gas if #1 is ok)

next, pull battery cable.

reconnect.

try to start. crank over.

check codes.

if you get code 11, it's the sensor inside the distributor.

other codes...check with forum.
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Unread 06-06-2007, 06:43 AM   #7
Rollin
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Quote:
Originally Posted by curtjames37
I would check the wiring to the CPS if you haven't already. What specifically did the code say?
When we looked it up online it said the signal from the CPS is missing
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Unread 06-06-2007, 05:28 PM   #8
BrunoS
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quick check: unplug and then reconnect the CPS connector and try to start it. if it does, bad CPS. if not, still possible, but there is a way to check it per factory manual for signal.
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Unread 06-06-2007, 08:37 PM   #9
Rollin
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6 hours later................ we narrowed it down to the hall effect sensor. We did a quick test by unplugging it on my jeep, and the same symptoms arose. So we ended up going to the used car recycling center to get the sensor, but they made us buy a whole distributor so now we have a refurbished distributor and a running jeep
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Unread 06-07-2007, 05:49 PM   #10
BrunoS
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awesome.

a failed distributor sensor (only up to 98 so year) will give a code 11, and only after this sequence of steps:

unplug battery
replug battery
crank over motor (it won't start)
pull codes

it will show a 11 and then 55.

the 11 means the computer has never seen a distributor signal. it will only give you the code if you do the above steps, and if the distributor sensor is bad.

why? because if it fails after the motor has been running, it has already seen the signal from previous driving and won't give you the code 11.

big tip:

when the mopar distributor hall effect goes out, at first the car just stalls now and then. Then, it will just quit during running, but will start after cooling down. it then goes out completely. usually a hot day or idling in traffic this will be most apparent.
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Unread 08-13-2007, 08:42 PM   #11
gtospeeding
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Hey, check my thread out.
http://www.jeepforum.com/forum/showt...00#post4082200
Im either have to buy a cam or a crank sensor.
which do you think?
thanks ALOT

Quote:
Originally Posted by BrunoS
big tip:

when the mopar distributor hall effect goes out, at first the car just stalls now and then. Then, it will just quit during running, but will start after cooling down. it then goes out completely. usually a hot day or idling in traffic this will be most apparent.
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Unread 08-13-2007, 09:11 PM   #12
BrunoS
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bad distributor hall effect sensor. CKP, they call it. around $40, easy to install.
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Unread 08-14-2007, 12:36 PM   #13
gtospeeding
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thanks for the input guys, the problem ended up being the camshaft sensor, distributor hall effect sensor or the pick-up coil

everyone seems to have a different name for it
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