1991 E40D no first gear...
Junior User
Joined: Nov 2019
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You can check all the grounds at pcm while its unplugged too. Hopefully someone has the right diagram. I found this much easier after I took the whole harness apart under the truck. You can check your mlps there too.
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Freshman User
Joined: Dec 2019
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Does it have to be from a 91? Or are there interchanges?
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Freshman User
Joined: Dec 2019
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I'll be checking it out in the morning and hopefully I find something out of whack. Not much more it could be at this point I'd guess. Did you see my reply about getting 3.4v on the "D" terminal of the ecc relay when unplugged when I'm supposed to get none? What could cause this? And could this be a problem?
Thanks for the help.
Thanks for the help.
Junior User
Joined: Nov 2019
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The reason I say to put a jumper wire across the relay is so you can isolate that circuit and run your tests with key off. Thought I would clarify. This ended up being the easiest way for me to check everything with the pcm out of the loop. Did you ever ground solenoid 1 and 2 manually to make sure your trans shifts? Good luck.
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Junior User
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This is where I got mine. It was plug and play. $225 with $25 core charge included. Got it fedex with in a few days. I just kept my core. By the looks of yours it may be junk. He can tell you which numbers to match or you will see it on his website. If you have a good wrecking yard you may find one. I would still test continuity and voltage on all wires in question so you dont fry another one.
https://www.ebay.com/usr/pro-rebuild
https://www.ebay.com/usr/pro-rebuild
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Freshman User
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Thanks, I will check that out. I'll check the wires like you said just in case. I'm assuming the wires that crossed on the plug from my first post probably caused this but better safe than sorry.
Fleet Owner
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From: Mi'kma'ki
Yeah, I think it's safe to say you've found the problem. Some people attempt to repair them and just replace those blown capacitors too. So that explains the back feed of a small amount of voltage, coming back up the line evidently.
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I was actually half tempted to try it myself. I was thinking the same about the voltage. I'll post again the results but like you said, I'd think this was the problem. Thanks to you both for the help!