Having an issue with a Volvo EC20XT prominent no start. Had originally thought it was a controller issue. But replaced the controller and control timer and the problem still exists. What ever the issue is, its locking out both the starter signal and the fuel cutoff. I can bypass the start trigger and roll the engine over but I have no fuel solenoid control. This is an old unit and the boss is trying to squeeze whatever life out of it he can. He'll trade it in if I can get it to run. But that would be the issue.. Any help would be appreciated
So if I understand correctly it is an intermittent no crank issue? Or a crank but no start issue? Either way you may need to call Chadwick Baross in Chelmsford for a schematic. I have seen some of those smaller Volvos have issues with the shut off solenoid but they would turn over. More info please.
I did call. Used to be WoodCo. The closest he could give me was a diagram for a EC20-C. Completely different. That model uses an ECM (or IECM). The wiring is completely different including wiring numbers. I have a service manual, but the schematics in that are basic at best. No complete wiring layouts. And to answer the question, its a no crank, no start. About one out of 35-40 tries it will kick and run. Other than that, its a paper weight. Something is locking it out. I can run a bypass to the trigger for the starter and get the engine to turn over but without fuel cutoff solenoid control, it won't run. The joystick/arm safety switch works, bench tested every relay and bench tested ignition/key switch. Replaced the controller (gauge cluster) and the control timer (had that issue before) and still have nothing.
Ok. Let’s keep it simple then. Test the key switch. Do you have power in? If so does it send power out when you crank it? Every time? Volvo has a tendency to make things more complicated than they need to be but the fix isn’t always complicated.
I have power on all terminals including crank signal. Have since I started. That was the first thing I thought of. Had that fail on the EC35.
hey moderaters, can you move this thread over to the excavator section? There is a couple of Volvo guys on here who can probably find you the right schematic If they see this thread. OP can you post the serial number?
Hi Eric, Try this wiring schematic
That was the only schematic Chadwick-Baross could come up with and it doesn't match. This unit pre-dates the models with an ECU. Thank you though. The effort is appreciated.
Hi Eric are you sure of your machines heritage? I can 100% say that is the correct and only wiring diagram for an EC20XT, could you have a pel job painted up as a Volvo. Do you have a serial number?
Not in front of me. I do know its a model 263.But I've gone thru that schematic and none of the wire coding matches. I also still haven't found any sign of an IECU. According to Chadwick-Baross, even they can't find anything that goes that far back