We have a Nissan powered Tcm lift. no power to the lockoff. The relay that controls that circuit is getting power from the ECM.
But the circuit is not completed to GRD.?I have checked the relays, wiring ,lpg driver.???this truck had a dead battery at the time of failure, but I do not know which came first. the no start or the dead battery. It now cranks good and I have check all physical grds. Any help or leads would be appreciated Ray
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Grant89, presently the truck is up and running. It seems that any time the lift has a low or dead battery issue with excessive overcranking it takes out the LPG driver. This time a coil blew backfeeding into the ECM and taking the ECM out. I have completely disassembled the wire harness and made sure all grounds are intack. Our people here will crank one to death just to find out its out of LPG --- go figure--- Thanks for the interested and throw out your thoughts--- I am a good listener Ray
Are you still having issues with this truck
Hi Ray,
FG25N4 TCM - Engine Nissan H20PU41 ??
Checking email...
Best Regards
I have a link I use, but cant send pdfs from the link ??(copyrights)It was given to me from local TCM dealer.
Do you have a pdf of the schematic for this TCM you can send me,email is in profile,want to see what is diffrent between this and the other K21/25 schematics i have maybe a diffrent setup than the others....?
main crank relay ,traced wires directly back to this relay. swapped with known good relays. K25-L I do have access to pin test and schematic. This relay also runs the lpg assist solenoid, which is also not working. It does get power at turn of switch, but is not completed to grd---which appears to be in the crank sensor or the ECM??? Thanks Ray
What nissan engine is installed in this truck....is it the K21/25 Nissan engine?? What relay is it that you are checking????
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