Have checked grounds at ecm all have continuity to ground. The relay in fuse box for ecm dose not excite. I have both 12 volt supplies to the relay. If i ground the blue wire the code goes away but I get a speratic reading from ecm relay code. Have continuity from the back of relay post to both wires at ecm.
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Cat 279d3 crank no start. Cose e459-2
- Thread starter Glenn1944
- Start date
Nige
Senior Member
Have you checked the engine block ground.?
Check your message inbox for a schematic.
Check your message inbox for a schematic.
I have cleaned every ground i found so far. All at the battery. All the ones under the cab where it tethers to the chasis. Got a socket way back in on both ends where the engine is grounded to the chassis and cleaned the ground on the block behind the alternator
Nige
Senior Member
Check out the schematic. It may show an odd location you have missed.
Do you have any other Codes apart from the E495-2.?
Do you have any other Codes apart from the E495-2.?
Nige
Senior Member
So no power on wire 150-C147-OR.?
Go back to CONN 4, Pins 23 & 25. Do you have power at that point on 150-C212 & 150-C25.?
Nige
Senior Member
Big penny just dropped. That schematic is drawn wrong. 150-C147 should be drawn in BLUE, not red, because it will only have power when the keyswitch is ON.
The only way to get power at pin 87 of the relay is if the coil is pulled in by grounding wire C903-C59-BU (Engine ECM controls that) and thus the contacts close between Pins 30 and 87 of the relay.
The only way to get power at pin 87 of the relay is if the coil is pulled in by grounding wire C903-C59-BU (Engine ECM controls that) and thus the contacts close between Pins 30 and 87 of the relay.
Nige
Senior Member
Try turning the key on and see if you have power at Pin 87.
Nige
Senior Member
Try jumpering Pin 85 (C903) to ground. That should pull the relay in.
Nige
Senior Member
If that pulls the relay in then the problem is in wire C903 somewhere, or in the ECM itself.
By externally jumpering C903 to ground it is entirely possible that it could create other Diagnostic Codes because the relay coil is not being grounded by a "signal" (for want of a better expression) coming from the ECM
Nige
Senior Member
I don't want to be a prophet of doom but those Kubota engine ECMs do not have a stellar reputation for reliability.