Form No. 3433-858 Rev A Horizon Control Module For 96in Air Cool Z Master® Professional Riding Mower Model No. 74090—Serial No. 400000000 and Up Software Guide 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.
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 2
Engine Oil Temperature Increase Engine Oil Maintenance Decrease No Yes *Located on bottom row of some menu screens Product Overview g030387 Figure 1 1. LDU (Logic Display Unit) 3. Audible alarm g228164 2. MCU (Master Control Unit) Figure 2 LDU (Logic Display Unit) 1. Screen 2. LED status light 3 3.
Screen Engine Screens The screen displays icons and information relative to machine operation and is backlit for viewing in low light situations. The screen is located above the buttons. Engine-Off Screen When the key is on without the engine running, the Engine-Off screen displays (Figure 3). Refer to the Screen Icons (page 1) section for icon descriptions. LED Status Light The LED status light is multi-colored to indicate the system status and is located on the right side of the panel.
Engine Speed Mode Menu Selection Screen 3 modes are available: LOW, EFFICIENT, and MAXIMUM. The Menu Selection Screen displays when you place the motion-control levers in the NEUTRAL-LOCK position and press and hold the 2 outside LDU buttons. • LOW: Low transport speed/Low idle for reducing deck packing in wet mowing conditions. • EFFICIENT: Medium transport speed and maximum fuel economy and normal mowing conditions. • MAX: Maximum transport speed/High idle for extreme mowing conditions.
g030187 Figure 8 g038651 Figure 6 1. Hydraulic Trans Oil 1. Maintenance and Service 2. Gauges and Meters 4. Cancel/Exit 5. Toggle between screens 3. Advanced Settings 6. Enter/Return 2. Service History display 3. Service reminder reset was performed (e.g., 250 and 750 engine hours) Maintenance and Service Menu Engine Oil You can scroll between the following screens in the Maintenance and Service menu: This service reminder screen displays the hours until the engine oil maintenance is due.
Current Error Messages • Seat switch (highlights if on) This screen displays the current error as text with the engine hours at which the error occurred. The toggle button allows you to scroll between screens if multiple errors are active. If only 1 error occurs, the toggle button does not change screens.
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 1. Machine Information 2. Model number Gauges and Meters Menu 3. Serial number You can scroll between the following screens in the Gauges and Meters menu: Module Information • Engine Hours (page 8) The screen displays the current installed version of software and hardware for both the LDU (Logic Display Unit) and the MCU (Master Control Unit).
Fuel Economy This screen displays the US gallons/liters of fuel used per engine hour. g030203 Figure 19 1. Reset 3. Y (yes) 2. Are you sure? 4. N (no) g038363 Figure 22 1. Fuel Economy PTO Hours This screen displays a non-resettable, total PTO hour counter and a resettable trip PTO counter. 2. Displays US gallons/liters per hour Trip Statistics There are 5 trip statistics screens to scroll though and view. g030204 Figure 20 1. PTO Hours 3. Trip hours 2. Total hours 4.
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 2. Displays engine hours 4. Displays US gallons/liters of fuel 5. Play/Start 3. Displays PTO hours 6. Reset g030221 Figure 26 When a trip statistic is playing, the statistics are not highlighted and the reset button is blacked out and not available.
Alarms Pressing the reset button brings up a screen asking to select a reset option. The alarms screen allows you to activate and deactivate the audible alarm for individual errors. Press the Enter button to access individual error alarm settings. Every time you reset the hydraulic transmission oil service reminder, the module prompts you to select whether the machine was serviced with Toro Premium Hydraulic Oil. Pressing Y (yes) or N (no) determines the correct maintenance schedule.
Engine Settings Calibrate Engine Settings This screen allows you to adjust the engine speed at the Maximum, Efficient, and Low set points for both transport (clutch disengaged) and mow (clutch engaged) modes in 50 rpm increments. This screen allows the calibration of the actual engine speed to match the commanded engine speed. The enter button blacks out if the blades are not disengaged, the parking brake is not engaged, and the motion-control levers are not in the NEUTRAL-LOCK position.
Adjusting the Electronically-Controlled Low Mode Speed Adjustment Factory Defaults This screen allows you to reset system settings back to the factory default settings. Pressing the Enter button brings up confirmation screen; press Y (yes) to reset or N (no) to cancel. Note: Resetting the system returns the engine speed settings and alarm settings back to the factory default settings. When operating in low mow mode, press and hold the Low Speed Mode button reduce the engine speed (minimum of 2,250 rpm).
• ◊ Clutch Output Failure – Engine Error Codes: the system displays engine error codes provided by the engine manufacturer. – Clutch Output Fault: clutch output is open or shorted. – System Voltage Low: voltage is too low (less than 12.3 V). – Engine Communication Error: communication lost between the engine and module. – Module Communication Error: communication is lost between the LDU and MCU modules. – Anti-Stall Active: the mower deck has been disengaged in order to prevent the engine stalling.
Troubleshooting Issue Description Recommended Corrective Action Blink Red The engine oil service is due. Replace the engine oil and filter. Follow the reset procedure; refer to Engine Oil (page 11). Service the Transmission Oil Blink Red The transmission oil service is due. Replace the transmission oil and filter(s). Follow the reset procedure; refer to Hydraulic Transmission Oil (page 10) Low Oil Pressure Blink Red Safe Transport Mode—engine limited to Efficient mode and the PTO is disengaged.
System Error Message Module Communication Error Anti-Stall Active Wing Deck Interlock Fault (for applicable models) Status LED System Actions Issue Description Recommended Corrective Action Blink Red Safe Transport Mode—engine limited to Efficient mode and the PTO is disengaged. The communication between the LDU module and MCU module has been lost. Check the electrical connections at the LDU and MCU module. PTO disengaged, error displayed. Engine speed drops below operating limit.
