ECU Toast ?

Zero_Cool · Nov 23, 2015

I think my ecu on my 1992 Ranger is toast, I am getting a no start, and I have manually checked all my components to see if anything was toast, starter works, fuel pump works, all the relays work, fuses are fine the one thing that was not getting power is the plug for the clutch sensor (I have manual transmission M50D)

Essentially now when I put the key in the start position the lights on the dash come up, but fuel pump does not prime, and when I turn the key to start I get nothing.

Thoughts ???

Also are there any ECU's that are cross compatible with the Rangers, the code under the bar code is F17F-12A650-JA

kimcrwbr1 · Nov 23, 2015

Have you checked the computer relay? Have someone turn the key on while you listen to the relay. Put a long screwdriver tip on the relay and put your ear on the handle.

Zero_Cool · Nov 23, 2015

I checked all of them, I have a sneaky suspicion the ecu has gone bad, as the previous owner had gotten the ecu wet

kimcrwbr1 · Nov 23, 2015

Or possibly a corroded connector. Did you swap the fuel pump and EEC relays? They should be the same part!

Zero_Cool · Nov 23, 2015

|I will recheck it, where was that relay again, was it on the passenger side under the fuse box ?

kimcrwbr1 · Nov 23, 2015

Also check all of the grounds take them apart and sand metal to metal the computer should have a couple of them. I like to do them one at a time so you know where the problem was. If you do a bunch of stuff you have no reference for future issues?

kimcrwbr1 · Nov 23, 2015

Do you have a schematic? All of the sensers should have a 5 volt reference voltage, If the computer is getting voltage in but nothing coming out yes the ecm is probably toast. Dont buy another computer until you confirm that one is faulty.

kimcrwbr1 · Nov 23, 2015

I would think the fuel pump and EEC relays are right next to each other.. Do you have a power distribution box under the hood?

kimcrwbr1 · Nov 23, 2015

http://www.therangerstation.com/tech_library/EDiagrams/index.htm
Scroll down to power distribution 1of7

Zero_Cool · Nov 23, 2015

Yes it is on the passenger side

YungICY · Nov 24, 2015

I thought the ecu in my 85 went bad a while back and I shelled out like a hundred bucks to AutoZone to get a reman'd only to realize it was actually a shorted wire that had popped. Mine was the power wire coming out of the ecu relay. I would suggest sniffing around for any burnt electronics smell. Also checking voltage like kimcrwbr1 mentioned before you fork out any cash looking for an unknown problem.

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ECU Toast ?

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