Cummins ISB 5.9 Cranks but no fire-ECM power.
99 Holiday Rambler Endeavor 37CDS4 with Cummins 5.9 and Allison 3060. 180k miles. Just did a lot of major repairs including the following: -Cylinder head rebuilt, including new OEM sensors and cam se...
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My brother and I spent about half of the day trying to diagnose the problem. I'm pretty sure at this point we know we have a bad ECM. There is definitely constant power there, and the switched ignition works as it should.
We got a wiring schematic from Freightliner south carolina, and traced out all the wires. The lift pump still has no power, indicating the ECM isn't letting the pump run. I have put a battery directly on the lift pump to see if it would fire. With 15 PSI the engine doesn't even try to fire. Just cranks.
We got a wiring schematic from Freightliner south carolina, and traced out all the wires. The lift pump still has no power, indicating the ECM isn't letting the pump run. I have put a battery directly on the lift pump to see if it would fire. With 15 PSI the engine doesn't even try to fire. Just cranks.
