08 V6 3.7 Crank but no start - Jeep Commander Forums: Jeep Commander Forum
Regular Service / Maintenance This section contains discussion about regular service and maintenance (upkeep) of your Jeep Commander

 
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post #1 of 4 (permalink) Old 06-13-2012, 05:25 PM Thread Starter
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Angry 08 V6 3.7 Crank but no start

Hello All,
My CDR was running great one day, started running like it was missing a cylinder, putt putt. The next day I was going to autozone to get DTC's read, started and died at the end of the driveway. I have been unable to start the Jeep since. I have checked Battery, ok. I have replaced starter and crank sensor. I have spark tester on coils, I have tried 5 and get no spark. I have checked all fuses and relays, ok. I purchased an OBDII reader from scantool, but I get no DTC's. Check Engine light is on and remains on throughout start and blinks after 30 sec. I still show no codes. When I connect to the ECU it tells me I have two 1 with 12 PID's and 2 with 27 PID's. I have tried both with no success. I have tried the on off, on off, on off for DTC display on dash just states "DONE." What am I doing wrong? I have been stuck for a week
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post #2 of 4 (permalink) Old 06-15-2012, 10:01 AM Thread Starter
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Has anyone connected a scanner to their commander? Should I see two ecu's? I must ask again. This is like a rubic's cube.

Last edited by mtodd14u; 06-16-2012 at 02:37 PM.
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post #3 of 4 (permalink) Old 06-15-2012, 11:46 AM
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A simple way to diagnose a crank but no start problem is to spray carb cleaner into the intake while cranking the engine. If it tries to start its a fuel delivery problem, if it doesn't than it's a spark problem.

2006 3.7L 4x4
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post #4 of 4 (permalink) Old 06-15-2012, 12:47 PM Thread Starter
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Thanks, Raid. No spark. I have narrowed it to the ignition coils. Getting great voltage to; but no spark on spark gap tester on any of the 6 coils.
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  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Regular Service / Maintenance

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dtc , ecu , ignition coils , no start

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