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Unread 07-15-2011, 05:30 PM   #1
jeep_1982
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1997 TJ Wiring Diagrams

Hi!
New to the forum...
Wives Jeep Wrangler 97 will not start and Ive been troubleshooting the ignition system without any luck. Jeep will crank but gets no spark from the ignition coil. Changed crankshaft position sensor, camshaft position sensor, rotor, distributor, spark wires, and ignition coil. And still no spark, which led me to think it is the PCM. Ive opened up the backhousing of all three PCM connectors to check for pin issues but none where there. When looking at the wiring diagrams, they indicate C1, C2, C3, and for the pins use a letter and number, for example A17 on C2 for the 5V supply. However the physical PCM pins are numbered 1-11 on the first row and so on, without using any letters. What gives? Also how do u know which connector is C1 and C3? (obviously C2 is the middle connector from either side) Any help would be greatly appreciated, THANKS!

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Unread 07-15-2011, 05:38 PM   #2
Knuckelhead
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Do you have an OEM FSM?
Do you have an OBDII fault code?...
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Unread 07-15-2011, 06:09 PM   #3
99_TJ_Wyoming
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I use a site called www.alldata.diy.com they arent free, but they have absolutley everything bumper to bumper, they are a little tricky to navigate sometimes, you have to pay attention to the menus but they have tons of diagrams, schematics and blow aparts.
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Unread 07-16-2011, 07:31 AM   #4
jeep_1982
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I do have an OEM FSM and will check for codes this morning, will get back to you...
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Unread 07-16-2011, 07:35 AM   #5
jeep_1982
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I thought I would ask here for tips since I know more people will have tons of hands on experience with the exact issue im having. Manuals and wiring digrams dont do that, my question on the wiring diagrams is very specific. Plus saving $$ in this economy is top priority for everyone I would hope 
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Unread 07-16-2011, 01:21 PM   #6
Jonny Jeep
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My 97 FSM shows the PCM connectors as C102 (Grey), C150 (Black) and C151 (White).
The 98 FSM shows them as C1 (Grey), C2 (Black) and C3 (White).

Colours are from the 8W-90 Connector Locations section of the FSMs.
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Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
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Unread 07-17-2011, 06:08 PM   #7
jeep_1982
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OBD reader says "NO LINK," is this an indication that the PCM is bad?
Thanks for the reply Johny Jeep :-)
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Unread 07-17-2011, 07:29 PM   #8
Piratejonh
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My PCM had the same exact symptoms when it started to die. The final symptom was the OBD reader wouldn't talk to it.
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Unread 07-18-2011, 04:23 PM   #9
jeep_1982
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Would the bad PCM be the reason for getting no spark?
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Unread 12-05-2011, 08:41 AM   #10
mchambe77
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My jeep is doing the same!!

Did you get yours fixed and what fixed it??????? Was it the PCM??? Please contact ASAP 678-223-5577 Micah
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Unread 12-05-2011, 09:11 AM   #11
JWebber
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Have to checked your fuses at the PDC box under the hood. ASD relay circuit getting power? Also try switching the relays for another next to it.
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