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Old 04-21-2013, 11:51 AM #1
pcr777 pcr777 is offline
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Blown Fuse or Blown ECU?

Good morning all. I'm new here, so plz bear w/ me. I'm working on a 2001 4runner that got a jump start w/ the jumpers hooked up backwards. I've replaced the 120A Alt fuse, a 25A Tow fuse, and 2 other 15A fuses. Now, the engine turns over, but won't fire off. I've smelled fuel, but had to stop + go to work. I intend to verify spark and hopefully fuel to the engine next. I guess what I'm wondering is, could there be a blown fuse for the ECU? If so, where is it located? If not, could the ECU be fried? Any help would be appreciated.
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Old 04-23-2013, 01:01 AM #2
pcr777 pcr777 is offline
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Blown Fuse or Blown ECU?

Here's my follow up: First I pulled the EFI relay out for a half hour and checked the EFI fuse, which was not blown, and then reinstalled the relay. Then I pulled out a plug to check for spark. I've got fuel on the plug, but no spark. Apparently something in the ignition is burned or blown. Hopefully not the ECU. Any ideas?
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Old 04-23-2013, 01:17 AM #3
koulee koulee is offline
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Coils perhaps? Next time you want to jump start, just remember = (equal sign).

- = -
+ = +

Is how it should be hooked up.
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Old 04-23-2013, 01:40 AM #4
WArunner7710 WArunner7710 is offline
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If its a 3.4 I've got a spare ECU that just went on the market! Hope it turns out to be nothing big though!
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