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Old 04-10-2012, 07:47 PM   #1
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2002 TJ, No Crank, No Start

4.0L, Automatic

I have eliminated several possible causes, just want to check my thinking.

Turn Key, all electronics work, no crank.

Pulled starter relay and tried new relay, no change.

Jumped terminal 30 and 87 on relay with ignition on, starts and runs like a champ. Eliminates battery/starter issues, has to be in ignition circuit.

Jumped terminal 85 on starter relay to ground, if my thinking is right, this takes the neutral safety switch out of the mix? And leaves the ignition switch as the most likely culprit? If my thinking is wrong on this bypassing the neutral safety switch, please tell me.

Change the ignition switch, or am I missing something else?

The biggest reason I question this diagnoses is because since I've gotten the Jeep a year ago, I had an intermittent issue with no crank in park and had to put it into neutral to start. Which led me to original suspect the NSS, but I believe jumping 85 to ground bypasses that whole circuit.

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Old 04-10-2012, 08:29 PM   #2
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could be bad selenoid on starter

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Old 04-10-2012, 08:34 PM   #3
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Try this... while moving the shifter back & forth between Park and Neutral, try starting the engine. If it starts, your NSS (neutral safety switch) on the transmission or its wiring is bad.
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Old 04-10-2012, 08:37 PM   #4
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Quote:
Originally Posted by ALASKA99TJ View Post
could be bad selenoid on starter
If that was the issue, and I'm not mistaken, the starter would turn when the key was turn to the start position, it just would not kick the gear out to the flywheel?

Also, don't think it would start right up and run when you just terminal 30 and 87 of the relay if the solenoid was bad.

I could be mistaken, but don't think that could be the issue. Thank you for the input though.
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Old 04-10-2012, 08:46 PM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
Try this... while moving the shifter back & forth between Park and Neutral, try starting the engine. If it starts, your NSS (neutral safety switch) on the transmission or its wiring is bad.
I tried that first, repeatedly, before I pulled the jeep home. No luck.

My thinking is actuator pin, or ignition switch itself. Thank you Jerry, I know from reading the forums that you are one of the most knowledgeable people that comments on here. Read a post of yours from a few years ago, which is why I tried moving the shifter back and forth first.
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Old 04-10-2012, 08:48 PM   #6
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That's a good idea, someone else recently had a similar problem and it turned out to be the actuator pin. Good luck with it.
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Old 04-10-2012, 08:52 PM   #7
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Thanks. I tried to do my homework and try everything before asking. It got to dark outside to tear down the column, so I decided to ask and make sure my thinking was right, and take it apart in the morning.
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Old 04-11-2012, 09:13 AM   #8
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If anyone is interested, it was not the actuator pin, it was the ignition switch. I also wired in a push button start bypass the hood while I was at it, never know when it will come in handy in the future.
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Old 04-11-2012, 11:30 AM   #9
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Same thing happened to me, except the key didn't want to turn. Hit er on the end with a hammer and never had another problem

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