Burned out EMS

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JBScarborough
Regular Member
Posts: 3
Joined: Thu Sep 30, 2021 3:43 am
Location: Sonoma county
Isuzu vehicle(s): '89 pickup

Burned out EMS

Post by JBScarborough »

This is my burned out Engine Management System. If you look on the lower left, you can see the burned out components.
IMG_20211016_212713602.jpg
This is the back. You can see the melted solders. (I'm not really sure how you spell that!)
IMG_20211016_212451681_HDR.jpg
I bought a used replacement from Lithuania (of all places!) and it didn't work either. The truck starts, turns over for a second, and then quits. My understanding is that the component is responsible for keeping the fuel pump running, and is backed up by the fact that if I run a wire from the prong on the fuse that runs the fuel pump to another (fused) line, the truck runs great! (every light on the dashboard lit up like the Christmas House, though)

My question is this: Do you think that this isn't the real cause of the problem? (explaining why a part that looked just fine didn't solve it) I just realized you are going to need a picture of the Lithuanian part. Here it is:
IMG_20211016_214300661_HDR.jpg
Whaddaya think? Any help would be appreciated!

-Jeff
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puttputtinpup
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Posts: 11094
Joined: Sat Oct 08, 2005 5:18 am
Location: Winston Salem, NC

Re: Burned out EMS

Post by puttputtinpup »

I'd try replacing that one resistor and see what happens.
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Red Truck
Regular Member
Posts: 198
Joined: Wed Sep 18, 2013 7:10 pm
Location: Vader, WA

Re: Burned out EMS

Post by Red Truck »

If I remember the mnemonic correctly, that's 480 ohms. Sadly, Radio Shack used to sell them. Also sadly, I cannot repeat the mnemonic here!
R/
'87 Isuzu p'up 4ZD1/2.3 gas, carb'd, 5spd, 4WD, base model, Fed spec
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