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  #37  
Old 01-18-2012, 05:02 AM
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Re: Starting Problems 4.7

Frank, The fuel began after disconnecting ASD. I als checked power at Fuel pump relay which definetly should be at point 86 and it wasn't, again at point 85. This relay a diode type and positive side must be on a certain side in order to work properly. Thats what led me to believe I may have inadvertently connected a positive cable to block. Now I am geting 12v at point 30 on all relays, which is what I'm supposed to get. I'm going to test my theory in morning. If right my next question will be where the hell that cable goes. Might have to go look at another jeep to determine.
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  #38  
Old 01-18-2012, 11:21 AM
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Re: Starting Problems 4.7

I don't have the manual with me now, but it seems that the older WJ's have 12V on point 85 and not on 86. That is at least what i saw in the wiring manual yesterday. So your jeep should be ok. Did you feel the ASD relay switching when ignition is put in run (it will only be for 3 secs, so you will need someone to help)
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  #39  
Old 01-18-2012, 12:29 PM
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Re: Starting Problems 4.7

Don't have anyone too help check yet but will later. Checked ground connections. One coming directly off battery and two others that appear linked to fuel injection and power train connections going to block on passenger side. I'm still a little confused though because relays for fuel pump are diode type indicating that coil side power should come from point 86 not 85. but wiring diagrams has power coming from point 85? Looks as though everything was connected right. Going to have to wait till i get scanner to possibly find out whats going on.
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Old 01-18-2012, 01:42 PM
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Re: Starting Problems 4.7

Or you could check in the meantime the crank sensor connector, to be sure that no paint went into there.
I don't know if you have them, but on this site you can download the WJ manuals: http://www.nagca.com/forum/showthread.php?t=42535
These manuals can help you a lot for trouble shooting, especially the wiring diagrams.
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  #41  
Old 01-18-2012, 04:56 PM
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Re: Starting Problems 4.7

Frank, Checked the Crank Shaft Censor, Looks like contact were pretty clean. I'm begining to think it may possibly be the security system activated disabling the vehicle. I'll look at wiring diagrams in manual once I download. All connections seem to be correct. I've got tommorow off so will purchase scanner and see what we will.
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Old 01-18-2012, 09:25 PM
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Re: Starting Problems 4.7

But why all of a sudden the SKIS would prevent the engine from starting? Also the SKIS would not prevent the fuel pump to run for at least the 3 secs. What i understood is that if you use a wrong key, that the engine would start, but then shutts down after a few seconds.
Is the cooling fan still running as soon as you switch the ignition switch to run? This could be the connector on the cooling liquid temperature sensor. This sensor sits in between the alternator and AC pump and the connector is not that easy to reach, because it sits quite low. On my jeep, which has the hydraulic cooling fan, the PCM will regulate the fan to full speed when the coolant sensor signal is lost (ofcourse with the engine running). Not sure if this will happen with the electric cooling fan as well, but it seems to be logical that if the PCM looses the coolant sensor signal, that it will switch the cooling fan on, to prevent overheating.
I wonder if the OBDII scanner will tell more tomorrow, would be nice to solve this problem.
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  #43  
Old 01-18-2012, 09:34 PM
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Re: Starting Problems 4.7

Yeah frank the fan still comes on when i switch key to run. I'm going to look through manual you linked me with, maybe can find something I missed. When I get the scanner tommorow I'll get back with you. If I get reading then we'll know I'm getting power to unit atleast. This is going to take a little more time and money, but feel it's worth it. I really appreciate All the information from you and JGC, thanks guys.
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Old 01-18-2012, 09:53 PM
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Re: Starting Problems 4.7

The PCM should be alive, otherwise it would never have switched the fuelpump on. But so strange that the fuel pump started working after removing the ASD relay.
Attached the wiring diagram for 1999/2000 jeeps for the ASD relay. You can see that point 85 is connected to 12V.
Attached Files
File Type: pdf ASD relay.pdf (152.3 KB, 5 views)
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  #45  
Old 01-19-2012, 12:15 PM
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Re: Starting Problems 4.7

Just got a craftsman scanner at the pawn shop for 40, so will be able to do something tonite, once I get starter, and crankshaft sensors back on. I'll look at schematic also. I want to get this thing running by end of weekend, got work coming up and won't have time to get back to it till end next week. I'll get back to you. Thanks
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Old 01-23-2012, 12:04 PM
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Re: Starting Problems 4.7

hey frank found the original post. didn't know if you got other message either, but here is the jist of things. Scanner starts to read immediately, even before i turn ignition on. when I do turn on ignition screen goes haywire and pulsates. Also noticed vacuum pump, near passenger fender front, now comes on as well as fan. This is crazy, I did not disconnect anything other than what was needed to pull engine. Did notice a ground wire on transmission had broken loose will reconnect and try that.
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  #47  
Old 01-23-2012, 03:03 PM
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Re: Starting Problems 4.7

I don't recall any vacuum pump close to the passenger side fender. I know of the vacuum reservoir under the battery tray. But strange things are going on overthere. It almost looks like that the PCM is the problem.
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  #48  
Old 01-23-2012, 06:09 PM
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Re: Starting Problems 4.7

I checked terminals at ASD relay, and what I got was interesting. When I checked power across point 30 and 87 It gave me my battery voltage. This reading was with no key or ignition, which according to schematic shouldn't be happening. point 30 isn't connected to 87 till ignition activated. Then swithes from point 87a to point 87. at least according to relay. I'm wondering if a complete wipe of memory and reprogram would help. I'm going to try and trace why 30 and 87 are active without key, somehow theres power when there shouldn't be. Whatever it is may be causing the other things to go haywire. If yo can think of anything get back with me, I know eventually I'll get it. Thanks Sean
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