jeep wont start, i think i need a CPS - JeepForum.com
 
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post #1 of 11 Old 03-12-2005, 01:46 PM Thread Starter
Rock Kustoms
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jeep wont start, i think i need a CPS

So i changed my starter because i blew the old one up, and it still doesnt start

my codes are 11, 42, 12, 25, 55 in that order

meaning

CPS
ASD
Battery disconnected
IAC
End

i disconnected the battery to change the starter, and popped the fuse for the ASD about 4 days ago, the IAC im not sure about, can that affect start up? no, right?

should i replace my CPS, or should i try and ohm it out, does anyone have the values?

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post #2 of 11 Old 03-12-2005, 02:01 PM
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does it turn over at all or are you not getting anynmovement in the engine at all?

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post #3 of 11 Old 03-12-2005, 02:08 PM
jandj
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does it crank? CPS will keep it from starting not cranking. Battery disc. means nothing since you disc your battery. If the IAC goes bad your enigne will start but not idle, just replaced mine by the way. To check the CPS you can backprobe the elec connection by the intake manifold. The book says to discconct and ohm b & C and it should be open (overload). I don't like that way. If you have a anolog meter you can backprobe the connector one wire will have about 5volts (power from computer) one will be a ground, and other will be return power to computer. With the meter set up for voltage probe the ground and the return wires and crank the motor over you should see the meter jump from o volts to 5 volts when the engine spins (you do need an anolog meter not a digital it happens to fast for a digital to read). If you have any other ?'s let me know...

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post #4 of 11 Old 03-12-2005, 02:37 PM Thread Starter
Rock Kustoms
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cranks over fine

the b and c ohm trick doesnt work, im assuming A is the power, ill check that out b4 i go to get it
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post #5 of 11 Old 03-12-2005, 03:42 PM
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what did you get when you check between b and c? should have been either overload (open) or approx. 0 ohms (closed).

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post #6 of 11 Old 03-12-2005, 07:50 PM
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try and use an analog meter it will give you more of an acurate... often you will get E or OE when checking between b and c.... using the analog will give you a better direction for trouble shooting...

krx
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post #7 of 11 Old 03-13-2005, 06:15 AM Thread Starter
Rock Kustoms
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damnit, i get 0 ohms between b and c.....

do i need to crank it over while checking?
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post #8 of 11 Old 03-13-2005, 07:39 AM
CowboyPA
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Before you go tossing a CPS at it, make sure your ASD Relay is good... Get a wiring diagram and just check that it's getting power ground and trigger, then make sure it is putting out.. These are known to fail and sometimes fail only to a point of passing reduced voltage. So just because it clicks dont mean nothing.. Been down this road and lost money (used to work flat rate) being fooled by a click..
I will try to remember how to make the tool, but I was shown a way of using a 9v battery and an LED to test the CPS... You disconnect the CPS from the harnass and feed 9v into one wire and then watch the LED flash as the motor turns (being cranked).. If I find the diagram I will post it here later today

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post #9 of 11 Old 03-13-2005, 07:50 AM Thread Starter
Rock Kustoms
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asd is good, swapped it w/ the AC clutch relay..... the fuse for the ASD is also good
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post #10 of 11 Old 03-13-2005, 08:27 AM Thread Starter
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CPS replaced and she starts.....wont stay running at idle tho....IAC im assuming..... :-(
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post #11 of 11 Old 03-13-2005, 11:39 AM
jandj
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yup, if it won't stay running @ idle check the IAC.
cowboypa, I like that little tool for checking the CPS I may have to make one thanks for the idea....

sold my 96' XJ

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