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Horizon Control Module
For 96in Air Cool Z Master® Professional Riding Mower
Model No. 74090—Serial No. 400000000 and Up
Read this information carefully to learn how to operate and maintain your product properly and to avoid injury
and product damage. You are responsible for operating the product properly and safely. Read your Operator's
Manual for more information.
Screen Icons
The information screen uses the following icons:
Gauge and Meters
Advanced Settings
Maintenance and Service
© 2019—The Toro® Company
8111 Lyndale Avenue South
Bloomington, MN 55420
Fuel Level
PTO
Register at www.Toro.com.
Form No. 3433-858 Rev A
Software Guide
Processing
Language
Battery Voltage
Engine Hours
Cancel/Exit
Original Instructions (EN)
All Rights Reserved *3433-858* A
Printed in the USA
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Summary of Contents for Toro Air Cool Z Master 96in 74090
- Page 1 Processing Advanced Settings Language Maintenance and Service Battery Voltage Fuel Level Engine Hours Cancel/Exit © 2019—The Toro® Company Register at www.Toro.com. Original Instructions (EN) All Rights Reserved *3433-858* A 8111 Lyndale Avenue South Printed in the USA Bloomington, MN 55420...
- Page 2 Parking brake Toggle Between Screens Neutral Lock *Located in top row of the Information Screen Enter/Return Operator Presence Control (OPC) Previous Maximum Engine Speed Next Efficient Engine Speed Reset Low Engine Speed Play/Start Transmission Oil Maintenance Pause/Stop...
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Page 3: Product Overview
Engine Oil Temperature Increase Engine Oil Maintenance Decrease *Located on bottom row of some menu screens Product Overview g030387 Figure 1 3. Audible alarm 1. LDU (Logic Display Unit) g228164 2. MCU (Master Control Unit) Figure 2 LDU (Logic Display Unit) 1. - Page 4 Screen Engine Screens The screen displays icons and information relative to Engine-Off Screen machine operation and is backlit for viewing in low light situations. The screen is located above the buttons. When the key is on without the engine running, the Engine-Off screen displays (Figure Refer to the...
- Page 5 Menu Selection Screen Engine Speed Mode 3 modes are available: L , and M FFICIENT AXIMUM The Menu Selection Screen displays when you place the motion-control levers in the N position • : Low transport speed/Low idle for reducing EUTRAL and press and hold the 2 outside LDU buttons.
- Page 6 g030187 Figure 8 g038651 Figure 6 1. Hydraulic Trans Oil 1. Maintenance and Service 4. Cancel/Exit 2. Service History display 2. Gauges and Meters 5. Toggle between screens 3. Service reminder reset was performed (e.g., 250 and 750 3. Advanced Settings 6.
- Page 7 Current Error Messages • Seat switch (highlights if on) • Oil-pressure switch (highlights if on) This screen displays the current error as text with the engine hours at which the error occurred. The toggle • Engine temperature (shows temperature) button allows you to scroll between screens if multiple •...
- Page 8 Machine Information The screen displays the serial number and model number of the machine. g293225 Figure 17 1. Exit 2. Enter/Return g030190 Figure 14 Gauges and Meters Menu 1. Machine Information 3. Serial number 2. Model number You can scroll between the following screens in the Gauges and Meters menu: •...
- Page 9 Fuel Economy This screen displays the US gallons/liters of fuel used per engine hour. g030203 Figure 19 1. Reset 3. Y (yes) g038363 2. Are you sure? 4. N (no) Figure 22 1. Fuel Economy 2. Displays US gallons/liters per hour PTO Hours This screen displays a non-resettable, total PTO hour counter and a resettable trip PTO counter.
- Page 10 Advanced Settings Menu When the advanced settings menu is selected, the module prompts you for a 4 digit passcode. The default digits on the display screen are 0 0 0 0. g038364 Figure 24 1. Trip Statistics 1 4. Displays US gallons/liters of fuel 2.
- Page 11 Press the Enter button to access individual error alarm service reminder, the module prompts you to select settings. whether the machine was serviced with Toro Premium Hydraulic Oil. Pressing Y (yes) or N (no) determines Note: Not all audible alarms can be deactivated.
- Page 12 Engine Settings Calibrate Engine Settings This screen allows you to adjust the engine speed This screen allows the calibration of the actual engine at the Maximum, Efficient, and Low set points for speed to match the commanded engine speed. both transport (clutch disengaged) and mow (clutch The enter button blacks out if the blades are not engaged) modes in 50 rpm increments.
- Page 13 Adjusting the Factory Defaults This screen allows you to reset system settings back Electronically-Controlled to the factory default settings. Pressing the Enter Low Mode Speed button brings up confirmation screen; press Y (yes) to reset or N (no) to cancel. Adjustment Note: Resetting the system returns the engine speed...
- Page 14 – Engine Error Codes: the system displays ◊ Clutch Output Failure engine error codes provided by the engine • In order to protect the system components from manufacturer. exceeding threshold limits, the system limits the – Clutch Output Fault: clutch output is open or engine speed and/or disengages the clutch, which shorted.
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Page 15: Troubleshooting
Troubleshooting Issue Description System Error Message Status LED System Actions Recommended Corrective Action Replace the engine oil and filter. The engine oil service Service the Engine Oil Blink Red Follow the reset procedure; refer to is due. Engine Oil (page 11). - Page 16 System Error Message Status LED System Actions Issue Description Recommended Corrective Action Safe Transport The communication Module Mode—engine limited between the LDU Check the electrical connections at Blink Red Communication Error to Efficient mode and the module and MCU the LDU and MCU module. PTO is disengaged.