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Old 09-13-2010, 05:22 AM   #1
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High voltage jeep

Well I performed the ECU surgery by replacing 3 capacitors. The jeep starts right up but now my check engine light stays on. The codes are 33,35, 41, and 46. Voltage at the battery with engine running is 18.23v. Also the engine temperature climbs to 230. These symptoms were not there before I replaced the capacitors. Any ideas?

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Old 09-13-2010, 11:41 AM   #2
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maybe surgery was not quite a success. codes 41 and 46. ignore 33 if no A/C.

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Old 09-13-2010, 12:41 PM   #3
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i'd be looking at the voltage regulator. it is inside the alternator and replaceable........by you.
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Old 09-13-2010, 12:46 PM   #4
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True, but if the ecm isn't just right it will under or overcharge. I got one in last month that wouldn't charge a lick until I swapped it out with a different ecm. I would take your ecm back apart make make sure all your traces are clean of solder...one lil sliver making a bridge could potentially be the problem.
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Old 09-13-2010, 12:54 PM   #5
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Why not just replace the ECM and stop screwing around?
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Old 09-13-2010, 01:09 PM   #6
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Prolly cause they aren't cheap for a new one
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Old 09-13-2010, 01:20 PM   #7
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it may not be the charging, but the alternator output. maybe that is what caused the ecm problem in the first place.
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Old 09-13-2010, 09:12 PM   #8
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I'll pull the ECU again tomorrow and take a look. I put in the 220uf caps like the ones that came out but that is not the 22uf capsthat was described in the Surgery thread. Maybe that is the problem.
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Old 09-15-2010, 01:25 PM   #9
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Well I double checked my solder job and even tried the smaller 22uf capacitors. My alternator is a Denso 5684 75 amp. If I understand right it does not have a voltage regulator. Voltage is regulated by the ECM? What should I try next?

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