Electrical issue 2006 Jeep Wrangler Sport - JeepForum.com
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post #1 of 12 Old 06-29-2020, 02:44 PM Thread Starter
Brado90
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Electrical issue 2006 Jeep Wrangler Sport

My 2006 Jeep Wrangler 4.0 has an electrical issue that I'm having trouble diagnosing and hoping for feedback (thank you!). Symptoms are:

-Turn key to ignition and engine won't start...starter doesn't engage. No electrical "click". Ignition system seems dead.
-Dashboard lights do light up. Check engine light is on (has been going on and off for some time) but won't flash codes when i turn ignition key 3x.
-Problem first noticed when I was driving and heard what sounded like an electrical "pop" around the firewall area (not sure if dash or engine side..no electrical short odor) and factory stereo and dashboard lights shut off. Engine kept running. Stopped at my destination and everything was completely dead when i tried to start. Tow truck tried to jump start unsuccessfully...dashboard lights did light, but starter wouldn't engage.
-Nothing works when key is turned to Accessory. Dashboard lights do light up when turned to Ignition
-New battery, fully charged
-I checked the fuses in the engine and glove box fuse boxes.
-Confirmed starter will crank by bypassing ignition switch with direct connect touch to battery
-Does this sound like a component, ie relay is out? Or, more challenging...is there a short in some circuit?
Thank you in advance!!

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post #2 of 12 Old 06-29-2020, 04:16 PM
mukluk
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If you connect a scanner to the OBD2 port, will the scanner communicate with the PCM?
When you turn the ignition to on/run and the gauge cluster powers up, does the odometer display normal mileage or are there any error messages?
Do the voltage and fuel level gauges display correctly?
Can you hear the fuel pump operate for a couple seconds when you first turn the ignition to on/run?
Have you looked for any chafing, burned/melted spots, or loose connectors on the wiring under the dash and in the engine compartment?
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post #3 of 12 Old 06-30-2020, 06:57 AM Thread Starter
Brado90
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Thanks for the feedback. The odometer reads normal, no codes when key is switched to Ignition. I'll research the OBC2 access and start checking wires for obvious (hopefully) damage.
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post #4 of 12 Old 06-30-2020, 07:20 AM Thread Starter
Brado90
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Just confirmed the voltage and fuel gauges read correctly when I turn the key to Ignition. CD deck automatically cycles when battery is connected. Don't hear the fuel pump. All lights and accessories work, but they also all quit when I first noticed the problem while driving. Seems like its boiling down to a short on a key electrical circuit
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post #5 of 12 Old 06-30-2020, 12:04 PM
mukluk
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Recheck fuse 12 in the fuse block and fuse 9 in the PDC (relay box under the hood), preferably with a test light or voltmeter to make sure power is getting through them. Fuse 12 must have power going through it with the ignition turned on, fuse 9 should have constant battery power available.
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post #6 of 12 Old 06-30-2020, 01:34 PM
drewabril
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Here is a helpful youtube video troubleshooting some similar symptoms- might point you in the right direction:
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post #7 of 12 Old 07-04-2020, 11:39 AM Thread Starter
Brado90
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Thanks for the advise. I also have a OBDII scanner arriving today. However, my understanding is that the engine needs to be running to capture active codes? Is there any use for the scanner if the engine won't start, such as confirming the pcm is communicating or is not defective?
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post #8 of 12 Old 07-04-2020, 11:42 AM Thread Starter
Brado90
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Great video, thanks...really illustrates the diagnostic process. My 2006 Wrangler is a 6-speed manual so I don't have that 4th plug on the PCM. Hopefully makes things a bit simpler
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post #9 of 12 Old 07-04-2020, 01:14 PM
mukluk
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The engine does not need to be running for the scanner to connect and work, you only need the ignition to be switched on. If the scanner won't communicate with the PCM then that may be due to the PCM not powering up like it's supposed to, which based on your description of other symptoms is the reason I advised checking your fused battery and switched power feeds to the PCM.
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post #10 of 12 Old 07-05-2020, 02:01 PM Thread Starter
Brado90
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Great suggestions, thanks. I confirmed with a circuit test light that the #9 fuse under the hood has power with the ignition key off, and #12 fuse in the fuse box under the dash has power when the key is turned on. Checked all the other fuses just for the heck of it and all are live. I pulled the ASD relay and confirmed power to the neg & pos pins. I rec'd my OBDII scanner today and confirmed communication with the PCM and no stored or pending codes. My VIN was displayed. Feels like getting closer and good the PCM is at least communicating and key connections are live. Still no starter though!
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post #11 of 12 Old 07-13-2020, 07:28 AM Thread Starter
Brado90
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Thanks again for your recommendations. Thanks to the troubleshooting you recommended, I was able to assess with high confidence it was the ignition actuator pin or switch. Took it apart using another great video (
) and was happy to see the broken pin. Was able to replace both the actuator and switch and now have an operational Jeep!
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post #12 of 12 Old 07-13-2020, 09:46 AM
mukluk
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Glad you got it fixed, and appreciate the follow up information.

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