No spark , no errors , no impulse to the main injector - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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No spark , no errors , no impulse to the main injector

Unicarriers P1D1A15LQ

Hello guys
I am having quite a mysterious issue here. The forklift cranks good, there are no errors on the display , but there is no spark and no signal to the main injector. The work that i have done for know is : changed the EGI relay, changed the ECM, changed the injector and still no spark and no signal to the injector. I have checked the wires to the ECM from the injector, and they are all good. I also checked the wires to the relays and they are also good. I have changed the capacitor from a working machine, no difference. The ECM has a good negative and positive. Some suggestions ?
The only errors that appear is F-77 and F-75 , but those are for the lift solenoids. I have schematics for the forklift i also have the service manual, but i cannot trace the problem yet.

Posted 19 Apr 2022 15:49
Modified 19 Apr 2022 15:51 by poster
By Ivan_Takev
joined 19 Jun'20 - 5 messages
Sofia-city, Bulgaria

i.takev@abv.bg

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Did you ever resolve this problem? Im having the same problem.

Posted 28 Jun 2024 14:11
By raymond_j
joined 28 Feb'17 - 17 messages
California, United States

I can't fix stupid, but I can fix what stupid does.

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shake the y harness that the crank sensor wires go into. We just resolved the same issue it was a bad wire in the that y harness. (You can order just that chunk of harness so you don't have to splice anything)

We spent a lot of time and $$ to figure it out so good luck hope it helps.

Posted 23 Apr 2022 00:03
By Raymond_Rice
joined 14 Apr'22 - 5 messages
Washington, United States

Ray

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check crank sensor wiring not broken from memory looped under crank pulley or the sensor is faulty located around crank pulley area on r/hand side of motor if you are looking backwards if its broken or faulty no signal to ecm and no spark

Posted 19 Apr 2022 21:16
By skyreach
joined 2 Apr'22 - 40 messages
Victoria, Australia

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