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Old Today, 12:18 PM
 
246 posts, read 183,475 times
Reputation: 124

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Friend of mine had her car jumped by AAA. Car drove fine before the battery died over night, they jumped it and the car went into limp mode. Took it to the dealer and they determined the ECU was damaged, replaced it, now it drives fine.

She’s trying to get AAA to pay for it because they either crossed the cables or they used a 24v on a 12v battery.

But AAA keeps saying that their battery packs have reverse polarity protection- it won’t jump the car if the leads are crossed.

If that was the case then it wouldn’t have damaged anything...am I right? Is the reverse polarity protection on the battery pack only designed to keep the battery pack from blowing up?
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Old Today, 02:19 PM
 
Location: Aurora Denveralis
5,290 posts, read 1,757,170 times
Reputation: 7999
Jump packs are pretty sophisticated - far more so than the old vehicle-to-vehicle method.

Unless she saw them attach the pack wrong and then fix it, it's very unlikely they will ever admit doing so. It's already quite unlikely that an experienced road service person would do so. And yes, all but the cheapest jump boxes do protect against reverse- and over-voltage.

It's more likely coincidence or a secondary problem from being jumped at all.
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Old Today, 05:13 PM
 
246 posts, read 183,475 times
Reputation: 124
According to the dealer the car came in with PO328 knock sensor over voltage. They replaced the sensor, check engine light stayed on. They contacted a Toyota engineer and was told that the only way to fix it was the replace the PCM, they(engineer) also said that the only way it could be damaged was if it was jumped in reverse. They stated that the PCM PIN was damaged.

But AAA is saying that’s not possible because their packs have reverse protection. I have no clue what pack they used or how the person hooked it up, so assuming everything was done right, is there any way the battery pack was bad and could have caused it to damage the PCM?

Or is it the dealership just trying to make a quick buck?
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Old Today, 06:58 PM
 
Location: Metro Detroit Michigan
3,448 posts, read 937,622 times
Reputation: 2791
Quote:
Originally Posted by Range View Post
According to the dealer the car came in with PO328 knock sensor over voltage. They replaced the sensor, check engine light stayed on. They contacted a Toyota engineer and was told that the only way to fix it was the replace the PCM, they(engineer) also said that the only way it could be damaged was if it was jumped in reverse. They stated that the PCM PIN was damaged.

But AAA is saying that’s not possible because their packs have reverse protection. I have no clue what pack they used or how the person hooked it up, so assuming everything was done right, is there any way the battery pack was bad and could have caused it to damage the PCM?

Or is it the dealership just trying to make a quick buck?
If he put the cables wrong there would of been one hell of a spark when he tried to jump it and you would of smelled it.
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Old Today, 07:23 PM
 
Location: Brawndo-Thirst-Mutilator-Nation
15,808 posts, read 15,805,147 times
Reputation: 11709
Overvoltage and reverse-polarity protection is pretty good in most modern vehicles.............HUM, must have been a pretty crummy car or a pretty good zap!!!
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