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Old 09-02-2012, 10:39 AM   #1
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CPS Question

Ride not starting. Been trying to figure out why for four days now. How do I know if the crank position sensor is bad or how do I test it? I probed it and got one light back. Is that correct? Did the same with the MAP sensor n got one light also, but I dont think the MAP has anythg to do with starting.

Again... It cranks... but wont start.

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Old 09-03-2012, 11:14 AM   #2
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You would need to scope the signal while cranking the engine to determine if its bad. Check for fuel first. If you have fuel, you probably dont have spark. If you don't have spark, it could be a few things with the CPS, dizzy, and the main coil (if not coil on plug) being where to start.

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Old 09-03-2012, 11:22 AM   #3
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Quote:
Originally Posted by mickeygriffin View Post
Ride not starting. Been trying to figure out why for four days now. How do I know if the crank position sensor is bad or how do I test it? I probed it and got one light back. Is that correct? Did the same with the MAP sensor n got one light also, but I dont think the MAP has anythg to do with starting.

Again... It cranks... but wont start.
What do you mean "one light back"?

Your '97 TJ has the ability to generate its own diagnostic codes. Do so by turning the ignition switch on-off-on three times within five seconds and then leave the key in the on position. Give the diagostics time to run, the results don't appear instantly.

Within 3-5 seconds, you will see any stored diagnostic codes in the odometer at which time the CEL light will also start flashing a number of times equal to the codes displayed. If you did it correctly, you will always at least get a '55' in the odometer which only means that no more codes follow.

A 12 code is also common which only means the battery has been disconnected at some point in past history.

Here is a webpage that will define the possible codes that may show up...

ftp://rtfm.mit.edu/pub/usenet/rec.an.../general/part3
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Old 09-04-2012, 11:07 AM   #4
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Thanx... i was just about to run this to the shop. But Ill do this first. Will update
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Old 09-04-2012, 11:52 AM   #5
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A 42(!!!) sounds like me!!!! Question... Is the ASD and the power module the same?
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Old 09-04-2012, 12:00 PM   #6
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The ASD (auto shut down) relay is located inside the Power Distribution Center. It might have a problem, try swapping the ASD relay with another like the horn relay which is the same type of relay. Relays that have the same size inside the PDC are all the same and interchangeable.

Other possible sources of a 42 DTC...

An open or shorted condition detected in the auto shutdown relay circuit.

An open condition detected in the ASD relay output circuit.

An open or shorted condition detected in the fuel pump relay control circuit.

An open circuit between PCM and fuel gauge sending unit.

Circuit shorted to voltage between PCM and fuel gauge sending unit.

No movement of fuel level sender detected.

(I wish I was only 42! )
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Old 09-04-2012, 01:00 PM   #7
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Check fuse #11 in the fuse block behind the glove box.
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Old 09-04-2012, 01:05 PM   #8
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Whats fuse 11? Lol... Ill change the wheels at this point.

@Jerry id already beaten you to the relay merry-go-round... "NO JOY"
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Old 09-04-2012, 01:39 PM   #9
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Remove the glove box by sliding the strap off & lower it ‘til it comes out. Look behind the glove box, there is a fuse block there with about 20 fuses. The fuses have #s, find #11, pull it out & see if the small wire inside the colored plastic is broken. To be sure find one labeled "spare", pull it out & put it in the #11 space. Now see if it starts. If there is no spare, use #15 (radio).

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