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Old 12-17-2012, 08:35 PM   #1
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Help please computer problems!!!!!!!!!

I have finally finished the install of my new engine for my tj. The cage is in the seats are bolted and she's ready to run. Except I'm not getting any ground from the comp for the relays. So no go. I found the ground wires for the comp. it is grounded. I checked the ohm load threw the wire from the comp to the relay. It's fine. Now the new engine it the HO from a 2000 and the harness is the same. The comp is my original from the 1997. It's killing me I want to drive so bad. Please help me.

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Old 12-18-2012, 05:38 AM   #2
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What voltage drops do you get from battery to ecm, ecm to relay, andwhichever ground wire to battery? I wonder if there is a short that is throwing your resistance readings off? Dont forget a parellel cicuit lowers total resistance (short).

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Old 12-18-2012, 06:48 AM   #3
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You need the PCM from the 2000... It has a distributorless ignition system that is computer controlled. Your PCM from the 97 isn't going to work the same...
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Old 12-18-2012, 02:47 PM   #4
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I don't know voltage drop cause I can't get anything to do anything. The comp is not sending any signals to relays. And ya I know now about the coil pack. I'm looking for a 2000 comp. just making sure that there is not another problem. I can jump the relays and the starter will kick over and the fuel pump with start. Just can't get the comp to make them do it. I might be getting a 2000 comp tonight. I will let y'all know what happens.
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Old 12-18-2012, 03:56 PM   #5
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The starter should engage when you turn the key since that circuit doesn’t go through the PCM (computer). If not, you have a different problem.

Next, are you sure the coil side of the relays are getting power? Among other things the fuel pump & ASD relays need power to their coils from fuse 11 in the fuse block behind the glove box when the key is on. The ASD relay then powers the ignition coil(s) & fuel injectors through fuse 21 in the PDC.

Make sure that fuse 11 is getting power when the key is on. Also, is everything in the cluster working as it should when the key is on? One set of contacts in the ignition switch powers the starter relay signal as well as the cluster & everything from fuse 11 so depending on what is not working you could have a bad ignition switch.(?)

The PCM does control the ground to the ASD & FP relay coils. But in both cases it is only a temporary ground signal after you turn the key if the engine doesn’t start (get a signal from the crankshaft position sensor). So to check for grounds for those 2 relays you have to check them within 2-3 seconds of turning the key on. Then the PCM also pulses the ground to the coil(s) & injectors to control them to start & run the engine.


I notice that the only obvious external difference between the 1997 & 2000 PCMs & connections is 2 extra pin connections for the additional 2 coil pack wires. It might be possible that the 97 PCM will work if you have the 2000 harness with the 2 added wires. Just a guess.
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Old 12-18-2012, 06:51 PM   #6
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Update. The engine is a 99 single coil pack. And the starter relay is PCM controled. I followed the ground from the relay to pin 6. So the comp is not sending ground. I can bypass relay with wire and it will turn over. Just can't get computer to do it. And no gauges work at all. I can do the test and they sweep. The two grounds to the comp is 31 and 32. They are grounded to the engine. It's like the comp is not waking up.
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Old 12-18-2012, 07:24 PM   #7
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Auto or manual trans?

What is "pin 6"?

Do you have power to fuse 11 with key on?
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Old 12-18-2012, 07:34 PM   #8
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Manual trans. Pin 6 is the ground to the starter relay. And no power to fuse 11 with key on. I'm right here with it. And it reads 250MV. What does that mean?
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Old 12-18-2012, 07:47 PM   #9
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Correction!!!! I do have power to FUSE#11...
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Old 12-18-2012, 07:58 PM   #10
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If pin 6 is the A6 pin on the C-2 (center) connector to the PCM then that pin should be grounded (& grounding the PCM along with 31 & 32) to the tub by a bolt at the back of the engine on the right (left when facing the firewall) side. If that wire is not grounded that could explain a lot as that is G-105 & grounds a bunch of things including the fuel pump module & the starter relay. It is also where the A31 & A32 pins ground to the tub. Make sure if it is connected that it is clean & making good contact. If 31 & 32 are good but 6 is not showing a good ground then maybe there is an open in the wiring possibly at the splice. A bunch of wires are spliced at S-134 & all get grounded together at the back of the engine.

If you have no power to F-11 & the starter relay is not getting power & the cluster is not working as it should then the common point for all to get power is the ignition switch.
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Old 12-18-2012, 08:06 PM   #11
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I didn't test for power correctly. I do have power there with key on. And no the pin 6 I'm talking about is in the PCM plug on the right. The wire is Black with a light blue strip. It goes straight to the ground side of the starter really. I pulled all the tape and plastic off and followed it. And I am getting ground in. 31 and 32.
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Old 12-18-2012, 08:12 PM   #12
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Good news having power to F11. If you get the ground figured out it should fire up. It is misleading that the pin out says that C-2 A6 is P/N position sense. Makes it sound like it is a ground control pin but the ground distribution section shows it as grounded. BUT I NOW SEE THAT THE PCM PIN 6 WIRE & THE STARTER RELAY GROUND WIRE ARE BEFORE THE MANUAL TRANS JUMPER WIRE THAT IS UP NEAR THE CLUTCH PEDAL BYPASS SWITCH. Wow! I just noticed that! Look up there by the clutch & find that short jumper wire & make sure it is good. It looks like it should be a brown/light blue in & black out.
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Old 12-18-2012, 08:20 PM   #13
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I already have a jumper in that plug lol this is really throwing me cause my gauges do work. But they are not showing my volts or fuel. Idk yet about oil and coolant cause the jeep won't start. But nothing engine wise is working. If I turn the key the lights all come on like normal. But when I turn the key nothing. No fuel pump no starter nothing at all. All my lights work like head lights tail lights blinkers. And like I said I can by pass relays and get the fuel pump to kick on and starter to turn. Put new relays in still nothing. The computer is not waking up or it is fried. But I don't know how to check for that. It has just been sitting in the jeep for the past year.
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Old 12-18-2012, 08:20 PM   #14
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There still should be a splice along there & that other wire from the splice goes to the jumper, then to ground.
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Old 12-18-2012, 08:29 PM   #15
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I see what your talking about. It is grounded. But there Is one plug that I don't know what it is. It has 6 wires going in and four out. One 12v constant a ground and two others. One is solid green and the other black with pink. Those wires idk what they are for.
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Old 12-18-2012, 08:31 PM   #16
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It says 52772 B1
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Old 12-18-2012, 09:46 PM   #17
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Where is that connector located?

Are you saying pin 6 is grounded?

I misread that bypass connector. It is down by the transmission on the top right side. It is a black connector that should have a jumper wire in it. I think it also has the back up light wires in it. The one by the pedal is on the autos to bypass the clutch switch. The manual ones have the bypass where the neutral safety switch would be on the autos.
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Old 12-18-2012, 10:09 PM   #18
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Ok I found it. It has four wires. I don't see a jumper. It is just a plug. The wires were melted together tho. I'm guessing from the exhaust. I pulled them apart. Now what am I supposed to do with it.
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Old 12-18-2012, 10:18 PM   #19
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There should be a violet/white & violet/black. Those are for the back up lights. the other 2 either both black or one black & one brown/blue/ Those 2 should be connected to ground the 6 pin & the starter relay.
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Old 12-18-2012, 10:24 PM   #20
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Ya all 4 of those wires are in this plug. Do I need to cut plug and ground the black and black/blue?
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Old 12-18-2012, 10:28 PM   #21
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Of the wires coming away from that connector towards the trans the 2 black wires should loop around & form the grounding jumper. If not either just connect those 2 together or you can ground that wire up near the relay or the 6 pin at the PCM.
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Old 12-18-2012, 10:32 PM   #22
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I connected black to black. Now the engine will turn over. Sprayed starter fluid in the throttale body. No go. So still no fuel pump and spark. But a huge step forward.
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Old 12-18-2012, 10:37 PM   #23
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Since the wires were melted, make sure that the black/blue wire is grounded after connecting them & make sure the 6 pin/relay wire is grounded.
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Old 12-18-2012, 10:40 PM   #24
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What is the pin6 your talking about. What connector. And ya it was just melted at the connector.
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Old 12-18-2012, 10:40 PM   #25
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Typing while you answered. OK!!! & now the 6 pin is grounded.(?)

Now test the ground to the FP & ASD relay coils for 2-3 seconds when you turn the key on.
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Old 12-18-2012, 10:46 PM   #26
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The pin you were referencing in post #11. black/blue in C-2 (black connector?) I assumed it was center but you said right one.
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Old 12-18-2012, 10:47 PM   #27
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If pin 6 is the brown with blue then yes it's grounded. I'm reading 10.19m ohm on the power side of the relay to ground. And from positive side to post it's reading .01m ohm.
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Old 12-18-2012, 10:50 PM   #28
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Idk what I'm doing when it comes to wiring. Lol all I know is I grounded the brown with blue to the black wire and now my jeep turns over haha I'm trying to Figuar out how to test the ground with in 3 secs by my self haha
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Old 12-18-2012, 10:54 PM   #29
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Yes, that's all good if the starter relay is working. Now to get fuel & spark. Test ASD & FP relay feeds from the PCM as noted in #25
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Old 12-18-2012, 10:59 PM   #30
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FP is 2.3 ohm and ASD is 107.3k ohm

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