LS 180.b cranks but will not start - starts well in service mode

[LS 180.b]

Help - I have a 2004 LS180.b that will not start in normal mode. It acts like no fuel. The seat belt switch is working and it has fuel. In service mode it starts right up. What would actuate the fuel cutoff? Any help with this would be greatly appreciated.

 

[Mike10]

The axuillary hydraulic control handle must be in neutral. If it is not the engine will crank but the fuel shut off solenoid will not get power so the engine will start. If the handle is in neutral try wiggleing it a little to see if you can get the switch to activate. If you have hand controls it is the left pedal that must be moved.

 

[LS 180.b]

The axuillary hydraulic control handle must be in neutral. If it is not the engine will crank but the fuel shut off solenoid will not get power so the engine will start. If the handle is in neutral try wiggleing it a little to see if you can get the switch to activate. If you have hand controls it is the left pedal that must be moved.

Mike - checked aux neutral switch, seatbelt switch and seat switch - turns over well but will not start in run mode - fires right up in service mode - checked all solenoids and the diodes - all good - something is inhibiting fuel in run mode - has to be an interlock for fuel?

 

[Mike10]

Mike - checked aux neutral switch, seatbelt switch and seat switch - turns over well but will not start in run mode - fires right up in service mode - checked all solenoids and the diodes - all good - something is inhibiting fuel in run mode - has to be an interlock for fuel?

Took a look at the wiring diagram. My memory is not as good as it used to be. Since it starts in the service position the aux switch must be working ok. If you checked the fuses in the cab fuse panel, the two 7.5A fuses and they were good, then you need to go to the engine compartment fues panel. Under the cover of this panel are some relays and a diode. The diode looks like a regular two terminal connector without any wires coming out of the one end. Unplug the diode and check if you have power to the diode, if power then remove the fuel relay, this should be the one with the orange wire going to it. Two of the terminals in the base should have power when the key is in the one position. The orange wire gets its power from the cab fuse panel. One of the white wires gets it power through the diode. If you have no power at one of the white wires, then the diode is bad. If you have a volt meter that checks diode, then you can check the diode this way.