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post #1 of (permalink) Old 07-08-2007, 01:50 PM Thread Starter
 
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TJ - turn over no start

Hello,, Ok so I fell victim to myself and screwing around with my jeep. I put an adjustable map sensor on the jeep and not only did it not work, It blew two fuses and now the jeep doesnt start, yea!!! it blew the PDC or power distribution fuse in the glove box and the IOD fuse??? in the engine compartment, (Ignition off drain or draw fuse?????), And it gets better, I no longer have a check engine light that comes on when the key is first put in. The only explanation I have gotten for this is I'm about to pay 700$ for a new ECM. I have tested all sorts of stuff, injectors arent spraying, there is a fuse that isnt getting power in the engine compartment fuse box but I cannot Identify it, its in slot F21. The theory behind the MAP adjuster is you splice into a line that is supplying 5v that feeds to the MAP and by adjusting the voltage you can manually control your A/F mixture, for those who have a bunch of aftermarket or otherwise modifications. the MAP adjuster has 4 wires +/- and an in and out for the spliced line to the MAP sensor. Stuck in a rut....an electrical rut

Thanks Josh
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post #2 of (permalink) Old 07-08-2007, 01:56 PM
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So... does the TJ starter motor turn over when you turn the ignition to START?

Do you have an schematic?

Can you read a schematic?

Do you have a VoltMeter?
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post #3 of (permalink) Old 07-08-2007, 02:01 PM Thread Starter
 
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Sorry i was typing fast, yes it turns over.

I have been chasing the wires with a voltmeter, but my knowledge of electrical is middle of the road(enough to get me in trouble......)

Yes to the schematic, and again I understand most but not all of the schematics
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post #4 of (permalink) Old 07-08-2007, 02:33 PM Thread Starter
 
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Do to boredom and anger I tested the MAP adjuster and the wire that is supposed to be supplied with 5v from the Power distribution center to the Adjuster, had 12v coming from the Adjuster, which the 5v is supposed to be feeding to the adjuster, and the modified voltage line going to the MAP sensor from the adjuster had sporatic voltage from 4-12v.

So basically I sent 12v to where 5v was supposed to be coming from....... no idea what that would do. Shouldnt that just blow the fuse and thats it? or maybe the rule is if you feed the PDC 12v after midnight it turns into a gremlin.
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post #5 of (permalink) Old 07-08-2007, 02:36 PM
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Look at the diagram, is it fuse #7, 2nd row from the bottom, 2nd from the left?

Last edited by LEVE; 03-24-2009 at 08:43 PM.
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post #6 of (permalink) Old 07-08-2007, 02:40 PM Thread Starter
 
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My fuse box looks different, the fuse not getting power is in the engine compartment, lemme grab a camera real quick


(bad picture for the sake of quickness)

Last edited by Joshua; 07-08-2007 at 02:49 PM.
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post #7 of (permalink) Old 07-08-2007, 02:44 PM
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That would be the Power Distribution Box?

Is this it? Look at Fuse 21, a 20A fuse.

1998 TJ Power Distribution Center

Last edited by LEVE; 07-08-2007 at 02:58 PM.
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post #8 of (permalink) Old 07-08-2007, 02:53 PM Thread Starter
 
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Yes, pictured above

My next step was to attempt to figure out how to test relays, but I switched them out and nothing, the whole "no check engine light" has other people telling me ECM, ECM fuse or ECM relay???????
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post #9 of (permalink) Old 07-08-2007, 03:00 PM
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The next thing to do is start looking at why there's now power to what circuits. Usually an ECM won't cause a complete no-start. It could, but it's pretty well protected. The first thing I'd check is to see if the fuel pump's being tuned on for that 2 seconds, and if the ASD relay is being energized?

Look around... Do you have a FSM Schematic, or aftermarket? I'll be back in about 5 hours... let me know if you've made progress.

Last edited by LEVE; 07-08-2007 at 03:07 PM.
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post #10 of (permalink) Old 07-08-2007, 03:12 PM Thread Starter
 
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OK, I'll test the ASD circuit, and figure out how to test the fuel pump.

I'm strictly working off of the schematics in the back of the haynes book.

Thanks for the help so far..
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