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Old 08-13-2014, 11:38 AM   #1
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OBD2 Reader

what would be the reason why my OBD won't connect to the jeep & the engine won't turn over?

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Old 08-13-2014, 11:59 AM   #2
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More info needed

- Will not turn over when the the reader is connected or will not tun over at any time and the read never connects?

- Clairification on will not turn over. What happen when you turn the key, nothing? No starter engagement, no clicks? Do you have voltage from the battery?

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Old 08-13-2014, 01:13 PM   #3
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i was doing some engine work. i started her up & shut her down a few times with no issues. no major engine work was just looking for a hot/cold line in the fuse box to connect an electric fan.
then she just stopped turning on. got full voltage at the battery. starter engages. she just wont start. then i pluged in the OBD & no link.
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Old 08-13-2014, 01:30 PM   #4
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Quote:
Originally Posted by JazzTj97 View Post
what would be the reason why my OBD won't connect to the jeep & the engine won't turn over?
PCM could be fried. check the fuses first.
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Old 08-13-2014, 02:46 PM   #5
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Originally Posted by JazzTj97 View Post
starter engages. she just wont start. then i pluged in the OBD & no link.
Ok that is different from "won't turn over"
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Old 08-13-2014, 11:11 PM   #6
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Turn ignition switch to on three times in short succession to get your PCM codes displayed on the digital odometer display (assuming the PCM's not fried). The first two on's are short duration (like less than a second).

ON-OFF-ON-OFF-ON. Watch the digital odometer for codes and write them down. The sequence will end with the word 'done'. You can look up the codes on several sites on the net. Here's just one: OBD2 OBD Trouble Codes –
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Old 08-13-2014, 11:33 PM   #7
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sounds good i will give it a go
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Old 08-14-2014, 08:27 PM   #8
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What year? Believe there was a recall for certain year jeeps. I know my 2005 got a mailer stating that
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Old 08-15-2014, 05:52 PM   #9
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97 2.5l
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Old 08-15-2014, 05:57 PM   #10
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does anyone know if there is a harness or adapted that would make swapping these 2 out. the one on the left for the one on the right?

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Old 08-16-2014, 07:32 AM   #11
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Apples and oranges there, my friend. PCM's don't work that way, if you're replacing a PCM, it has to match the application....be sure you don't have other problems before replacing it. I'm not certain, but I think a friend of mine has the correct one for a 97 2.5...I'll check with him later today
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Old 08-16-2014, 09:35 AM   #12
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it was a long shot.
anyone aware of any pcm checks. other than my obd not connecting and not getting any codes from the on/off on/off on suggestion i got earlier. i am at a stand still.
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Old 08-16-2014, 10:09 AM   #13
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Often, not always, on the 97 PCM problems can be traced to a bad ground (where the PCM contacts the firewall) or loose connector pins within the wire end connectors. Check those before buying a PCM.

After re-reading your initial problem, I'm not clear on what your Jeep is able to do under the present circumstances. Do you have power? Lights work? Wipers, radio? Do the gauges move when you turn the ignition on? Will the engine turn over (I understand it won't start or run)? When probing for a power terminal in the fuse block, could you have blown a fuse? Check All fuses inside and those out under the hood.

Also, which transmission do you have? My friend does have a 97 2.5 PCM
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Old 08-16-2014, 10:27 AM   #14
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i have lights, radio works but gauges do not move. she wont start its almost there but wont start. thought it was the starter, but no. tried the cps [crankshaft sensor) no go. she wont connect with the obd. & like i said no pcm codes.
i have a manual transmission.
i will double check all fuses & grounds.
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Old 08-16-2014, 10:35 AM   #15
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Okay, when you turn the ignition switch to ON, can you hear the fuel pump (inside the tank) come on?

We were at Mesa Verde National Park a couple months ago. Stopped for gas in Cortez, CO and when I tried to start and go it wouldn't run. Lost fuel pump at the snap of fingers! I never would have believed it would drop like that but it did!

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