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General Discussion / Re: 2004 Cummins ISL 400
« Last post by Eric Maclean on May 31, 2024, 06:41:34 PM »Don
Your post states your working on a 2004 with a Cummins and your profile shows you have a 2006.
For clarification we need to know What year make and model are we working on to get the wiring diagrams right
We need to know whether it's a engine no crank or crank no start.
With that said here goes.
You stated you have poor or low voltage to the ECM
1) First check the ignition side buss bar in the electrical bay to be sure the ignition solenoid is not going. Bad your looking to see if you have a good 12 volts with the ignition on..next check each of the ECM feed circuit breaker on that buss bar to verify it has good voltage going out .
2) depending on the coach in the rear usually in the back of the battery bay there should be an ECM power relay check it to make sure you don't have a bad wire or a bad relay.
3) check. The wiring around the battery area your looking for 2 or 3 fuse holders ( again coach dependant) these supply direct 12 volts to the ECM and the TCM and can get corroded from the battery acids causing problems.
4) check all your battery cables and ground connections
Hope this helps
Eric
Your post states your working on a 2004 with a Cummins and your profile shows you have a 2006.
For clarification we need to know What year make and model are we working on to get the wiring diagrams right
We need to know whether it's a engine no crank or crank no start.
With that said here goes.
You stated you have poor or low voltage to the ECM
1) First check the ignition side buss bar in the electrical bay to be sure the ignition solenoid is not going. Bad your looking to see if you have a good 12 volts with the ignition on..next check each of the ECM feed circuit breaker on that buss bar to verify it has good voltage going out .
2) depending on the coach in the rear usually in the back of the battery bay there should be an ECM power relay check it to make sure you don't have a bad wire or a bad relay.
3) check. The wiring around the battery area your looking for 2 or 3 fuse holders ( again coach dependant) these supply direct 12 volts to the ECM and the TCM and can get corroded from the battery acids causing problems.
4) check all your battery cables and ground connections
Hope this helps
Eric