# Check Engine Light

**URL:** <https://forums.speedlife.net/t/check-engine-light/98299>\
**Category:** SON240sx Automotive\
**Created:** [July 25, 2006, 11:16am UTC](https://forums.speedlife.net/t/check-engine-light/98299 "2006-07-25T11:16:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Axlerod](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@Axlerod](https://forums.speedlife.net/u/Axlerod)\
**Post date:** [July 25, 2006, 11:16am UTC](https://forums.speedlife.net/t/check-engine-light/98299/1 "2006-07-25T11:16:57Z")

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Has anyone else had a check engine light come on as soon as you connect the battery?

This is an SR into a '90 S13, with a DOHC KA cluster.

I have no clue what is causing this… and the ECU that came with the clip fried itself when I first tried, though I later found out that it had severe water damage and that was probably the cause. However I don’t want to fry another ECU…

The only wiring I’ve done was to re-pin the plugs behind the battery to match wires, and swap the dash plug and match up the 5 needed wires there. This was done correctly, I’ve checked it too many times to count.

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**Author:** ![alesserfate](https://avatars.discourse-cdn.com/v4/letter/a/f6c823/32.png) [@alesserfate](https://forums.speedlife.net/u/alesserfate)\
**Post date:** [July 25, 2006, 11:44am UTC](https://forums.speedlife.net/t/check-engine-light/98299/2 "2006-07-25T11:44:36Z")

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check the grounds, i had that happen

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<div class="post-metadata">

**Author:** ![Axlerod](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@Axlerod](https://forums.speedlife.net/u/Axlerod)\
**Post date:** [July 25, 2006, 12:35pm UTC](https://forums.speedlife.net/t/check-engine-light/98299/3 "2006-07-25T12:35:04Z")

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> [@alesserfate](#):
>
> check the grounds, i had that happen

On the motor harness, or elsewhere?

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**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\
**Post date:** [July 25, 2006, 1:11pm UTC](https://forums.speedlife.net/t/check-engine-light/98299/4 "2006-07-25T13:11:47Z")

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i would check your dash wiring for shorts.

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**Author:** ![Axlerod](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@Axlerod](https://forums.speedlife.net/u/Axlerod)\
**Post date:** [July 25, 2006, 5:46pm UTC](https://forums.speedlife.net/t/check-engine-light/98299/5 "2006-07-25T17:46:36Z")

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Ok, I checked every ground on the ECU plug, and they are all good.

I checked every pin on the dash plug for a short to ground and there is nothing, except the speedo signal gives me 30 ohms… is that normal?