Blowing Main ECU Fuse

trucker14

New member

Equipment
L3901HST
Jan 25, 2019
1
0
0
Blasdell
My L3901HST is blowing the 5 amp fuse from the ignition to the Main ECU when I let up on the speed control pedal. Makes me think its the acceleration sensor, but why would it blow when I let up on the pedal instead of pressing down? Do you think it is the sensor or the ECU? This started when I started getting an E 20 code. I think I have that fixed since it isn't showing up anymore when I turn the key.
 

200mph

Well-known member

Equipment
L4740-3 Cab, FEL, Fnt Snow Blower L2185, LP Finish Mower, LP Rotary Mower
Mar 3, 2017
1,228
58
48
PA
Maybe the the pedal/linkage is hitting the wiring harness and causing the wire to short.

Might want to consider using a circuit breaker while trouble shooting the situation.
 

mikeinAiken

New member

Equipment
L3901HST,BH77, LA525, 4 in 1 bucket, grapple, tiller,boxblade
Nov 11, 2019
2
0
0
Aiken, Sout carolina
My L3901HST is blowing the 5 amp fuse from the ignition to the Main ECU when I let up on the speed control pedal. Makes me think its the acceleration sensor, but why would it blow when I let up on the pedal instead of pressing down? Do you think it is the sensor or the ECU? This started when I started getting an E 20 code. I think I have that fixed since it isn't showing up anymore when I turn the key.
Did you ever find out what caused this failure? I have about 500 hours on my L3901HST and have the same failure. The 5 Amp ECM fuse blows when I release the HST from forward.
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,286
4,853
113
Sandpoint, ID
Did you ever find out what caused this failure? I have about 500 hours on my L3901HST and have the same failure. The 5 Amp ECM fuse blows when I release the HST from forward.
You more than likely have a bad HST switch. ;)
 
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pghponton

New member

Equipment
L3301 w/LA765 FEL
Jun 29, 2016
6
0
1
Salem Twp, PA
HELP!!! Where is this HST switch located??? I am having the same issue and want to test the resistance but I can't find it. Somebody please help me, getting frustrated. Thanks in advance.
 

Chanceywd

Well-known member
Lifetime Member

Equipment
Kubota L2501DT BH77 VIRNIG URG60-CT 1950 8N
Mar 26, 2021
556
390
63
central ny
Isn't the L3901 the same chassis as The L2501? My manual says it is located in the steering column support area.