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See if any trans keypad error codes. Trans error can inhibit start. Or dash grounds.
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LMTV starting issues
- Thread starter reelclassic
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Wes11293
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I’ve even changed out the TCM under the distribution panel with a known good one.. trans just shows N for neutral no codes as far as I can see..
Wes11293
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Where does the dash ground ? Is it grounder once mounted down or a certain wire I should check?
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Arrow up and down at same time in n on keypad see if there are codes. Grounds usually under the power panel right side is a big grouped ground. You an try sanding the connections and making sure its all tight. Does it run and drive if you start it from the starter?
Wes11293
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Not at the truck at the moment but will check again for codes just to be sure and check the ground. It turns over when starter is jumped yes I didn’t hold it too long maybe just a few seconds though and it didn’t fire up. Been sitting a long time? So maybe it was or wasn't getting fuel to injectors yet
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Are you sure you have fully charged batteries and all the connections are good?
Wes11293
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Yes 100% have 4 brand new batteries and after replacing the ECM have good power up to the hot post on starter solenoid, the reverse polarity box, 24 BAT and IGN , 12v BAT and IGN posts on distribution panel. When I run test leads to the other starter post and try to start the engine regularly nothing Happens. But when I jumper the solenoid it fires?? Do you think it’s shorted wire ? I’m lost here haha
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If the engine computer isnt happy it wont open the injectors. If you have a heavy code reader you can plug into engine diag and see if any codes. A1 trucks its not always a simple diagnosis.
Wes11293
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I’m beginning to notice how not simple this A1 is at the moment. Ok I have a computer I can hook up to it so let’s say I don’t see any codes and also I don’t see injector pulse but the ECM has power to the correct pins and ground to the correct pins.. what would be the issue or possible issue? If I bypass the safety relays and wire straight to solenoid would the injectors fire or no?
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Theres a bunch of engine sensor that can prevent the computer from firing. If you lost prime and theres no fuel at the pump that can throw an error. It wont open the injectors but I think it would let you crank. You can try to crank it from the starter with the dash switch on and see if it starts. You can crack a line at the pump see if there is fuel there.
Wes11293
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If it starts by jumping the solenoid and the solenoid is brand new why wouldn’t it crank? Only think I can think is a shorted wire from the push button switch or bad ground as you stated
Wes11293
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Ok... now after putting the whole dash back together... I have ground at the ECM pin 70 where I should have switched power .. I had switched power to 70 before hang now I’m lost
coachgeo
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Wes11293
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Is this a real answer or?...If it's lost.. it's in the sock drawer or the dryer
Ok where the heavy gauge wire 24v and 12v comes into the cab on the back side of the PDP in the cab are those the ignition relays? They have cables and each have two small wires coming from them?