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  #49  
Old 01-23-2012, 06:23 PM
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Re: Starting Problems 4.7

Frank, Had son turn ignition on while I checked relay contacts points, noticed when coil active voltage across point 30 and 87 dropped below battery voltage. When he turned ignition off voltage returned to normal, which isn't normal. I'll keep chugging.
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  #50  
Old 01-24-2012, 03:17 AM
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Re: Starting Problems 4.7

When the ASD relay is energized, there should be 0V between points 30 and 87.
If there still is a (low) voltage, it means that there is resistance between the relay contact points and you get problems (lower voltage and less current) to the components connected to it.
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  #51  
Old 01-24-2012, 08:33 AM
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Re: Starting Problems 4.7

I'll recheck with jumper cable between coil contacts and see if Voltage. I thought there should be voltage. Does the relay when activated remove voltage/ redirect to starter relay?
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  #52  
Old 01-24-2012, 01:28 PM
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Re: Starting Problems 4.7

If the relay is not energized, you should measure battery voltage between points 30 and 87.
With the relay energized, the contact between point 30 and 87 closes, so when the contact doesn't have resistance (as it should), you should measure 0 v. (when you would measure between point 87 and ground, you should have battery voltage)
The ASD relay switches power to the PCM (one of the power inputs), but also to the ignitor coils and the fuel injectors (the PCM will control the ground for the coils and injectors)
The ASD relay doesn't do anything for the starter circuit.
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  #53  
Old 01-24-2012, 09:04 PM
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Re: Starting Problems 4.7

Frank just trying to figure out what comes first. So with the ignition on and ASD Relay energized I should read battery voltage at point 87 to ground. When power is applied to PCM through ASD, It controls ground for injectors and Coil through the use of Crankshaft sensor and cam shaft sensor correct? So my problem seems to be somewhere within this system, and it's a matter of figuring it out.
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Old 01-24-2012, 11:09 PM
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Re: Starting Problems 4.7

Yes, its more or less like that. Ofcourse there are several other inputs used by the PCM to calculate fuel injector pulse width and ignition timing. The power input from the ASD relay into the PCM has only a monitoring function. If the PCM switches the ASD relay on, it should see 12 V at this input, otherwise it will set a DTC.
But when you put the ignition switch in run, the ASD relay will be energized for 2 secs only and then the PCM will deenergize it again, when it doesnīt sense the engine running.
The battery voltage measured at point 30 of the ASD relay without key in ignition, is normal.
To me it looks that something else is going on then a problem with the ASD relay.
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Old 01-30-2012, 01:28 PM
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Re: Starting Problems 4.7

Frank, sorry been busy trying too make some money to put into my Jeep!!!!! I've been going back through all my connections and still haven't found anything out of place. Will keep trying. Question could a 2000 jeep with a vin of N have a 32 tooth engine in it, and can you tell from passenger camshaft sprocket? I opened old one up and counted 30 teeth how many should it have if it were a 16tone engine? Thanks sean
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Old 01-31-2012, 07:07 AM
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Re: Starting Problems 4.7

Sorry, but i canīt answer this question. Probably some other member can help you out on this.
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Old 02-06-2012, 04:22 PM
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Re: Starting Problems 4.7

Frank, still haven't figured out whats going on. Looking into wether newere engine is a 32t or 16t engine, almost hope thats the problem. I know you said you didn't know what count was on ccamshaft, but have you heard if stamped on camshaft sprocket with ngc it's a 32t crankshaft?
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Old 02-06-2012, 05:32 PM
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Re: Starting Problems 4.7

Yes, the NGC uses the 32 tone wheel. As far as i know, you should be able to count the openings in the wheel, which should be 32 in the NGC case, or 16 in case of the JTEC.
Some research on the net made me clear that the 16 tone wheel was used on 99-02 WJ's. You could recognize this engine on the 3 connector PCM and separate TCM.
03-04 WJ's should have the 32 tone wheel and a 4 connector PCM and no separate TCM (TCM is integral part of the PCM in this case)
There are exeptions though, because my 04 WG has the 3 connector PCM, separate TCM and is then JTEC with the 16 tone wheel.
Some people on the net said that the crankshaft and camshaft have the same tone wheel, but i couldn't find any info on this from Chrysler.
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  #59  
Old 02-06-2012, 06:42 PM
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Re: Starting Problems 4.7

Frank, Thats what I thought. I was almost hoping I'd put the wrong engine in, but the Tone rings on the camshaft match up 16t on both engines. I guess I'll go ahead and reassemble everything and recheck all connections. If I keep having the same problems I'll have computer blanked and reprogrammed. Last resort though. Thanks for all the help I'll keep you informed on whats going on. Sean
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Old 03-20-2012, 10:37 PM
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Re: Starting Problems 4.7

Frank, Thanks for all the help. Finally figured out what was wrong. It was a combination of where I grounded and the fact that one of the leds to computer from wiring harness wasn't fully engaged. I have a good understanding of Jeeps now and won't hesitate to purchase another one when the opportunity presents itself. Thanks again for all your help. Sean
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