2006 no crank, no start. Do all Jeeps go through this?

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CarnageCarter

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Hey guys, recently went to start my jeep, and it wont start. It has full power though. All had been running fine until this point. First checked the ignition actuator, and it does not appear broken. Next bought a new battery, since it needed one anyway and it Still did not start. Bought brand new clamps, and checked all the cables as well. Decided to tow it to the shop, so i pushed it out to the street, and lo and behold it started. Took it to the shop anyway, and they started it 3 times and then it stopped working. Left it there, and got a call about an hour later saying it was a loose ground (where though? I checked the only 2 I know) and that I could pick it up. My wife went to pick it up, and sure enough, it won't start again. But they were going to be closed for the next 4 days, so we ended up just towing it home. I now have replaced the ignition switch as well. And put in a new starter at the mechanics recommendation. I have tried jumping the starter, and it will crank. Bypassing the starter relay also lets it crank. Tried the clutch override techniques, and they didn't have an effect. So Any advice??

This is a 2006 manual transmission TJ for the record. Everything else runs great
 
It sounds like there is some electrical gremlin somewhere.
Realistically, you’ll need to chase the signal to the starter from the ignition switch. The idea is to find out where the signal stops. If there is signal getting to the relay, you know the ignition switch is good. But if there is no signal at the relay activation pin, either the ignition switch is bad or there’s a wiring fault along it.

Start by downloading the FSM for your 2006 TJ:
https://wranglertjforum.com/threads...ice-manuals-fsm-technical-documentation.4618/
Go through the wiring diagrams and see if you can test each point from the ignition switch onward to see where the fault is.

Also, have you tried swapping the starter relay for another relay?

As for the grounds, there is a battery ground on both the firewall and the engine block. Both must be in good condition. In addition, be sure to check any grounds coming out of the ignition switch itself, and any coming from the PDC.
 
Go into the engine compartment and check the fuel pump relay in the PCM to see if it clicks when the ignition is turned to ON. IF it does click; do you hear the fuel pump whine for 3-5 seconds upon turning the ignition switch to ON ? IF you dont hear the fuel pump run; then check the Automatic Shutdown Relay to see if it's bad.
You should consider checking the fuel rail pressure of at least 49 psi at the schraeder bleed connection.
Next would be to see if you are getting spark to the plugs...
After this would be to test to see if you are getting 5V to the CKPS and the CMPS.
 
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Thank you for that resource, i will try and take a look this evening. When it comes to electrical stuff, I am a bit out of my element. But I have a friend with a voltmeter coming saturday to look with me, So that's a great place to start. I used to be able to hear some sort of electrical clicking(relay click?) when trying the key, now with the new switch I hear nothing. So i either did the ignition switch wrong, or there is some bad\shorted wire somewhere. I will check both, and check continuity. And to answer your question, yes I have tried swapping relays, and it did not work. Where would I find grounds coming out of the ignition switch? In the bundle of 10 wires? is that something I can find in the FSM?
 
CharlesHS said:
Go into the engine compartment and check the fuel pump relay in the PCM to see if it clicks when the ignition is turned to ON. Do you hear the fuel pump whine for 3-5 seconds upon turning the ignition switch to ON ?
You should consider checking the fuel rail pressure of at least 49 psi at the schraeder bleed connection.
Next would be to see if you are getting spark to the plugs...
After this would be to test to see if you are getting 5V to the CKPS and the CMPS.
Click to expand...
I don't hear anything when I turn the ignition. I used to hear a single click, like the sound of a relay activating, but nothing else. But now I don't even hear that.
 
When you replaced the ignition switch; did the harness connector look to be in good condition or did it have indications of the harness connector getting too warm ?
Check the fuses in the PCM to see if any are blown.
 
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I’m not quite familiar with where the ignition switch ground is. You might have to pull the trim panels and maybe the instrument cluster off to find it. Fortunately, those are very easy to remove.

Are you hearing the click from the starter? If so, your starter solenoid might be bad. You can sometimes smack on it with a hammer to get it to start if that’s the case. Usually it’s easiest to replace the whole starter, but you can just replace the solenoid.
 
CharlesHS said:
When you replaced the ignition switch; did the harness connector look to be in good condition or did it have indications of the harness connector getting too warm ?
Check the fuses in the PCM to see if any are blown.
Click to expand...
Nothing looked warn or anything. Everything looked normal to me, but I don't know electrical stuff very well. And I have checked all the fuses, except for the larger square ones. I dont really know how to check them?
 
Steel City 06 said:
I’m not quite familiar with where the ignition switch ground is. You might have to pull the trim panels and maybe the instrument cluster off to find it. Fortunately, those are very easy to remove.

Are you hearing the click from the starter? If so, your starter solenoid might be bad. You can sometimes smack on it with a hammer to get it to start if that’s the case. Usually it’s easiest to replace the whole starter, but you can just replace the solenoid.
Click to expand...
I will take the instrument panel and trim apart and see if I can track that down, thank you.

In regards to the starter, its brand new. I have jumped the starter and it cranks. And i bypassed the relay and it cranks. So I don't think its the starter or solenoid.
 
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CharlesHS said:
Once you check the starter solenoid; you should have a look at the starter relay in the PCM and see if it clicks when trying to crank the engine.
Click to expand...
Nothing clicks at all when I try the ignition. No noises whatsoever. I have power to the dash, but the gauges dont move or anything.
 
CharlesHS said:
Check for bad fuses in the PCM...
Also check the condition of (3) 32 pin ECM harness connectors to ensure they are not oxidized and are fit snugly into the ECM connectors.
Click to expand...
Ya I just checked all those, and everything looks clean and dry.

when I turn the key, the only thing I hear now is a relay clicking in/under the glove box. Nothing else happens. I am so confused
 
So several unplugged things under the steering column area. Do any of these matter? Also what the heck is this white bulb thing? And this green cord behind the glove box looks important...does this need plugged in somewhere?

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CarnageCarter said:
So several unplugged things under the steering column area. Do any of these matter? Also what the heck is this white bulb thing? And this green cord behind the glove box looks important...does this need plugged in somewhere?

View attachment 187862

View attachment 187863

View attachment 187864

View attachment 187865
Click to expand...
Picture 1 is the courtesy light. It comes on with the cabin lights.
Not sure what harness picture 2 is.
Picture 3 is the antenna wire for the stereo. It appears to be unplugged. Shouldn't affect the starting system.
Not sure what that 4th picture hsrness is.
 
Have you checked the ignition electronics. It’s located on left side of key switch. It’s held on with security torx screws . You need a security a torx bit with small hole in center. Mine did the same as yours and that was my problem. I also replaced the center section of switch because the pot metal prongs are prone to break.
 
So
Steel City 06 said:
Picture 1 is the courtesy light. It comes on with the cabin lights.
Not sure what harness picture 2 is.
Picture 3 is the antenna wire for the stereo. It appears to be unplugged. Shouldn't affect the starting system.
Not sure what that 4th picture hsrness is.
Click to expand...
I don’t have power to the courtesy light, or my switch for my exterior high beam lights...what could be causing this?
 
Steel City 06 said:
Picture 1 is the courtesy light. It comes on with the cabin lights.
Not sure what harness picture 2 is.
Picture 3 is the antenna wire for the stereo. It appears to be unplugged. Shouldn't affect the starting system.
Not sure what that 4th picture hsrness is.
Click to expand...
Thank you for the clarification on those
 
Silver Surfer said:
Have you checked the ignition electronics. It’s located on left side of key switch. It’s held on with security torx screws . You need a security a torx bit with small hole in center. Mine did the same as yours and that was my problem. I also replaced the center section of switch because the pot metal prongs are prone to break.
Click to expand...
Yes I have checked all that. I checked the actuator, and bought a new ignition switch. Still nothing. I do not seem to be getting power where I need it. The dash lights up, but that’s it. Gauges don’t move
 
CarnageCarter said:
So

I don’t have power to the courtesy light, or my switch for my exterior high beam lights...what could be causing this?
Click to expand...
That could be related. If the signal isn't getting to the electronics on the steering wheel, it could cause problems like that. Check in the FSM and see if there is a common ground or power supply for those items. There is likely a ground lug somewhere you can try cleaning. It usually looks like a small wire with a ring terminal that is just screwed to the metal body somewhere. I seem to recall one or more underneath the support for the wheel tilt mechanism, which is located behind the instrument cluster.
 
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