Troubleshooting; Quick Reference Troubleshooting Guide; Diagnostic Light; Diagnostic Ace Display - Toro Reelmaster 5200-D Service Manual

Troubleshooting

Remove all jewelry, especially rings and
watches, before doing any electrical trouble-
shooting or testing. Disconnect the battery
cables unless the test requires battery voltage.

Quick Reference Troubleshooting Guide

Diagnostic Light

The RM 5200-D/5400-D is equipped with a diagnostic
light and red fault lamp located on the steering tower that
indicate if the electronic controller is functioning correct-
ly. The green diagnostic light is located under the control
panel, next to the fuse block. When the electronic con-
troller is functioning correctly and the key switch is
moved to the ON position, the controller diagnostic light
will be illuminated and the fault lamp will be off. The
lights will blink if the controller detects a malfunction in
the electrical system. The lights will stop blinking and au-
tomatically reset when the key switch is turned to the
OFF position. The fault will be retained in memory.
When the controller diagnostic light blinks, one of the fol-
lowing problems has been detected by the controller:
1. One of the outputs has been shorted.
2. One of the outputs is open circuited.
Using the diagnostic display, determine which output is
malfunctioning (see Verify Output Functions and Re-
trieving Stored Faults).
If the diagnostic light is not illuminated when the key
switch is in the ON position, this indicates that the elec-
tronic controller is not operating. Possible causes are:
1. Loopback is not connected.
2. The light is burned out.
3. Fuses are blown.
4. Not functioning correctly.
Check electrical connections, input fuses, and diagnos-
tic light bulb to determine malfunction. Make sure loop-
back connector is secured to wire harness connector.

Diagnostic Ace Display

The RM 5200-D/5400-D is equipped with an electronic
controller which controls most machine functions. The
controller determines what function is required for vari-
ous input switches (i.e. seat sensor, key switch, etc.) and
turns on the outputs to actuate solenoids or relays for the
requested machine function.
For the electronic controller to control the machine as
Electrical Systems
CAUTION
For effective troubleshooting and repairs, you must
have a good understanding of the electrical circuits and
components used on this machine (see Electrical Sche-
matics and Electrical Harness and Connectors Drawing
section of this manual).
If the machine has any interlock switches by-passed,
they must be reconnected for proper troubleshooting
and safety.
desired, each of the input switches, output solenoids
and relays must be connected and functioning properly.
The Diagnostic ACE display is a tool to help the user
verify correct electrical functions of the machine.
1
1. Diagnostic light
1. Loopback connector
Page 5 - 4
Rev. A
Figure 5
2. Fuse block
1
Figure 6
2. ECU
Reelmaster 5200-D/5400-D
2
2