Reader Comments .........................................................................................................................................2

Revision History .............................................................................................................................................3

Safety ...................................................................................................................................................................7

Maintenance and Service ...............................................................................................................................7

General Information...............................................................................................................................................8

External Reference Material ...........................................................................................................................8

Toro DIAG Software .......................................................................................................................................9

Acronyms .......................................................................................................................................................9

Glossary .......................................................................................................................................................10

General Electrical Diagnostic Information............................................................................................................ 11

Consumable Materials List ........................................................................................................................... 11

Special Tools ................................................................................................................................................ 11

Inspecting the Harness and Component Connector Assemblies .................................................................. 11

Repairing the Wire Insulation .......................................................................................................................12

Testing the Electrical Circuits........................................................................................................................12

InfoCenter Diagnostics .................................................................................................................................13

InfoCenter Icons ...........................................................................................................................................14

Troubleshooting Intermittent Electrical Faults...............................................................................................16

Frequently Used Procedures ...............................................................................................................................17

Connecting and Disconnecting the 12 Vdc Battery .......................................................................................17

Connecting and Disconnecting the 48 Vdc Battery System ..........................................................................19

Reading Faults .............................................................................................................................................20

Clearing Faults from the InfoCenter..............................................................................................................21

Preparing for Troubleshooting and/or Testing ...............................................................................................22

Returning the Machine to Service.................................................................................................................22

Toro DIAG - Quick Start ................................................................................................................................24

Replacing a Toro Electronic Controller (TEC) ...............................................................................................26

Fault 1: Engine Coolant Temperature High-CRM Stop......................................................................................28

Fault 2: Engine Coolant Temperature High-Engine Shutdown ..........................................................................33

Fault 4: Input Pull-Up Enable (IPE) Voltage Too Low ...........................................................................................39

Fault 5: Main Power Relay Failure.......................................................................................................................40

Fault 6: Key Start Timeout...................................................................................................................................46

Fault 8: 12 Vdc Charging System Voltage Too High ............................................................................................49

Fault 9: 12 Vdc Charging System Voltage Too Low .............................................................................................53

Fault 13: Ignition Switch Malfunction ...................................................................................................................57

Fault 15: Engine Speed Switch Broken ...............................................................................................................61

Fault 16: 12 Vdc Alternator Malfunction...............................................................................................................66

Fault 17: The Reel Enable Output is Over Current ..............................................................................................70

Fault 19: Engine Coolant Temp Sensor Out of Range .........................................................................................73

Fault 21: ID Module Fault ....................................................................................................................................76

Fault 24: Joystick Broken ....................................................................................................................................81

Fault 26: Engine Start Output Signal Current is Too High ....................................................................................84

Fault 27: Engine Run Output Circuit Fault to Fuel Actuator..................................................................................89

Fault 28: All 48V CAN Bus Devices Offline..........................................................................................................94

Fault 29: 48V Battery Low Voltage ....................................................................................................................101

Fault 30: 48V Bus High Voltage.........................................................................................................................104

Fault 31: 48 Vdc Key Switch Overvolt................................................................................................................108

Fault 32: Unknown Cutting Unit Fault ................................................................................................................ 112

Fault 33: Unknown Motor/Generator Fault ........................................................................................................ 113

Fault 34: Unknown Master Controller Fault ....................................................................................................... 114

Fault 37: TEC Output Current to Glow Plug Relay is Excessive ........................................................................ 115

Fault 38: CAN Bus Fault-CRM 1 ..................................................................................................................... 118

Fault 39: CAN Bus Fault-CRM 2 .....................................................................................................................125

Fault 40: CAN Bus Fault-CRM 3 .....................................................................................................................132

Fault 41: CAN Bus Fault-CRM 4 .....................................................................................................................139

Fault 42: CAN Bus Fault-CRM 5 .....................................................................................................................146