Quick Reference Troubleshooting Guide; Diagnostic Lamp; Verify Input Functions - Toro Groundsmaster 580-D Service Manual

Troubleshooting
For all electrical problems, use of the Quick Refer-
ence Troubleshooting Guide is recommended. Us-
ing the Diagnostic ACE Display allows you to
quickly find the source of the electrical problem.
If the machine has any interlock switches by--passed,
they must be reconnected for proper troubleshooting
and safety.

Quick Reference Troubleshooting Guide

Diagnostic Lamp

The Groundsmaster 580--D is equipped with a diagnos-
tic lamp that indicates if the Electronic Controller Unit
(ECU) is functioning correctly. The diagnostic light will
be on when the ECU is functioning correctly and the
ignition switch is to the ON position. The light will flash
if the ECU detects any of the following malfunctions in
the electrical system:
1. An electrically "open" condition.
2. An electrically "shorted" condition.
3. There is an over temperature condition in the
ECU circuitry.
3
2
Figure 5
1. Diagnostic lamp 2. ECU
Diagnostic ACE Display
The Groundsmaster 580--D is equipped with an ECU
that controls most of the machine functions. The control-
ler determines which function is required for various in-
put switch conditions (i.e. seat switch, ignition switch,
etc.) by producing various outputs to actuate solenoids
or relays.
Electrical System (S/N 30101 & Up) (Rev. E)
1
3. Loopback connector
Page 8 - - 8
See Chapter 5 - - Electrical System (S/N Below 30101)
for additional Troubleshooting information. Only compo-
nents that are different or new information is provided in
this Chapter.
Each of the input switches, output solenoids, and relays
must be connected and functioning properly for the ECU
to properly control the machine.
The Diagnostic ACE display will help the user verify cor-
rect electrical functions of the machine.
1
Figure 6
1. Diagnostic ACE display

Verify Input Functions

1. Park machine on a level surface, lower the cutting
units, stop the engine and engage the parking brake.
2. Locate wire harness and loopback connector. Care-
fully unplug loopback connector from harness connec-
tor.
3. Connect Diagnostic ACE display connector to the
harness connector. Make sure correct overlay decal is
positioned on Diagnostic ACE display.
4. Turn Ignition switch to ON; do not start machine.
Groundsmaster 580--D