euclides5370
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Do u know where is the fuse for the ECM
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MTVR turns over but won't start
- Thread starter sandcobra164
- Start date
euclides5370
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Also I found this cable 1976 stamp on it one cable is going to the ground and this is separated and kind like brocken
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
It is not in the fuse box. It is in the bundle of wires above the 3rd valve cover closes to the cab. Looks like a blank plug or dummy plug. Pull it out and there is a fuse inside. Should be 2 near eachother. One ecm one tcm
euclides5370
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This is the other cable going to ground and they split behind the battery box and they 3 are together and 1 is going to ground
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
Random accessory cables. Ignore
euclides5370
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Let me check here for power disconnect the ECM is kind a pain on the ass
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euclides5370
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What's side is for me look for power left or right
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
Like I said previously. Pin 70 on connector closest to rear of the truck (right) Key on power. Turn off power to truck before disconnecting ecm
euclides5370
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I check and there is power all of them 24v
euclides5370
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So I just check the pin for the ground ones and the 24v and everything is good there just like the text and what's u told me about the pin 70
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
See if you can get the screen in the cab to attempt to open the ecm data. If it shows blank serial number and programming code it is a dead exam
euclides5370
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When I click engine codes shows me that and no fmi codes on next screen
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
So ecm is alive to some degree. Interesting. Engine should start then given the fuel is primed properly.
euclides5370
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- Location
- walnut creek ca
I connect on the jpro it's saying is. Not 24c is like 4.55 on the battery battery are good and crank very strong
Attachments
- 551
- 1,219
- 93
- Location
- Gainesville, GA
You didn't mention you had diagnostic tools.......... Could've saved 2 hours..... Anyways if you got 24v on the pins to the ecm then the ecm is getting 24v into it. Now the internal voltage coverter may have failed, battery failed causing increased resistance or many other things. Can Jpro show live engine rpm data and injector firing? If so I would monitor the ecm voltage while cranking and check engine rpm signal.
euclides5370
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- Location
- walnut creek ca
Jpro is. Not connecting properly because the voltage I believe
euclides5370
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- walnut creek ca
Hot to replace that internal voltage coverter or fix
- 551
- 1,219
- 93
- Location
- Gainesville, GA
You can’t. Ecm has to be replaced with a rebuilt and reprogrammed unit
- 941
- 1,481
- 93
- Location
- La Crosse, WI
Really seems like you need to slow down and go though the systems methodically. The tim will read out items like oil pressure, rpm etc, it gets those from the ecm. Check all wires look for breaks. Check all fault codes. If you post up codes and wire numbers members here can reference them.
euclides5370
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- walnut creek ca
Im getting the cat soft and try with that in the morning