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Groundsmaster 4300 Diagnostic Fault Code Quick Reference Table Page 1 of 4

GM 4300 DIAGNOSTIC FAULT CODE QUICK REFERENCE TABLE

Fault

Number

Fault Title

Controller

Affected

Fault Condition/Circuit

Description

Additional Notes

Service Actions

Engine Coolant

Temp PTO Kill

Master

This fault is reported when the

engine coolant temperature has

reached 105 °C (220 °F).

PTO will be disabled

1) Test the cooling fan function.

2) Inspect the airflow passages.

3) Check the coolant level.

Engine Coolant

Temp Engine Kill

Master

This fault is reported when the

engine coolant temperature has

reached 115 °C (240 °F).

Engine will be shut

down

1) Test the cooling fan function.

2) Inspect the airflow passages.

3) Check the coolant level.

Fuse Failure

Master

This fault is reported when the

fuse is blown on one of the

output circuits on the master

TEC.

1) Check 7.5 amp fuse F2-1

protecting outputs 1–4 on the

master TEC.

2) Check 7.5 amp fuse F2-2

protecting outputs 5–8 on the

master TEC.

3) Check 7.5 amp fuse F2–3

protecting outputs 9–12 on the

master TEC.

IPE Voltage Too

Low

Master

This fault is reported when the

inputs or outputs on the master

TEC are not working correctly.

This is an internal

circuit board fault

inside the master TEC.

1) Replace the master TEC

controller.

Main Power Relay

Failure

Master

This fault is reported when the

main power relay on the master

TEC has failed.

1) Test all of the 7.5 amp fuses.

2) Test the function of the main

power relay.

3) Ensure that the master TEC is

getting 12 Vdc from the relay.

Key Start Timeout

Master

This fault is reported when the

ignition key has been stuck or

held in the “Start” position for

more than 30 seconds.

If the key was being

held for more than 30

seconds, returning key

to the “Run” position

will clear the fault.

1) Check the ignition key switch

function.

2) Check all connections for

corrosion.

Software

Incompatible

Master

This fault is reported when either

the machine model number is not

valid, or the master TEC

controller received a message

from another master TEC

controller on the bus circuit.

1) Reprogram the machine using

Toro DIAG.

Summary of content (4 pages)

PAGE 1
GM 4300 DIAGNOSTIC FAULT CODE QUICK REFERENCE TABLE Fault Number 1 Fault Title Controller Affected Engine Coolant Temp PTO Kill Master 2 Engine Coolant Temp Engine Kill Master 3 Fuse Failure Master 4 IPE Voltage Too Low Master 5 Main Power Relay Failure Master 6 Key Start Timeout 7 Software Incompatible Fault Condition/Circuit Description Additional Notes This fault is reported when the engine coolant temperature has reached 105 °C (220 °F).
PAGE 2
Fault Number 8 Fault Title Controller Affected Fault Condition/Circuit Description Charging Too High Master 9 Charging Too Low Master 10 Can Bus Timeout Engine Master 12 Can Bus Timeout InfoCenter Master 13 Key Switch Broken Master This fault is reported when the alternator is producing more than 16.3 volts. This fault is reported when the alternator is producing less than 8.8 volts. This fault is reported when the master TEC has lost communication with the ECU for at least 5 seconds.
PAGE 3
Fault Number 24 Fault Title Controller Affected Fault Condition/Circuit Description Joystick Broken Master This fault is reported when both the deck raise and lower inputs are active. 26 Engine Start Out Master This fault is reported when current through the Engine Start output is too high. 27 Engine Run Out Master This fault is reported when current through the Engine Run output is too high. 37 Glow Out Master This fault is reported when current through the glow plug relay is too high.
PAGE 4
Fault Number 60 Fault Title Controller Affected Fault Condition/Circuit Description PRV2 Out Master This fault is reported when current through the front PTO valve is too high. 61 PRV Out Master This fault is reported when current through the counterbalance valve is too high. 68 Alternator Not Charging Master This fault is reported when the alternator is producing less than 8.8 volts. 69 Engine Oil Pressure Low Master This fault is reported when the engine oil pressure is low.