Part of the Yanmar Repair Manuals.
A -7A series excavator that cranks but will not fire rarely has a worn part to show you: the fault lives in the E-ECU, a sensor input, or the fuel rack control, and guessing costs your crew a day of standing still. This 162 page PDF is Yanmar's electronic control manual for the TNV engines fitted to 5 to 8 ton -7A series mini excavators, covering the 3TNV82A-Z, 3TNV84T-Z, 3TNV88-Z, 3TNV88-E, 4TNV84T-Z, 4TNV88-E, 4TNV98T-Z, 4TNV98-Z and 4TNV98-E.
The Control System section walks through the engine control unit, fuel injection pump, EGR valve, accelerator sensor and relays, with the electrical values to test each one. The back half is the service tool operation manual: reading fault codes, freeze frame data, diagnostic tests, data logging and ECU identification from a laptop.
Buy it once and it is yours to keep for this machine, saved to your laptop and printable page by page for the bench.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Tnv Series Electronic Control Manual | 1-3 | Engine Control Unit, Fuel Injection Pump, EGR Valve, Accelerator Sensor, Harness, CAN Bus Termination |
| Specifications | 4-19 | Outline |
| Precautions on the Use of Electronic Control Components | 22-25 | Esd Precautions, Connector Handling, Battery Disconnect Procedure |
| Control Scheme | 26-42 | E-ECU Signal Flow, Fuel Injection Quantity Control, EGR Feedback Loop, Sensor Input Mapping |
| Harness | 43-45 | Harness Routing, Connector Pinout, Wire Gauge Specifications, Ground Points |
| Control Functions | 46-84 | Injection Quantity Control, Idle Speed Control, Overheat Protection, Dtc Detection Logic, Fuel Limit |
| Accelerator Sensor | 85-88 | EGR Valve, Fuel Injection Pump |
| Sub Relay | 89-91 | Main Relay |
| Starting Aid Relay | 92-93 | Glow Plug Relay, Cold-Start Aid Circuit, Preheat Timer Control, Starting Aid Activation |
| Coolant Temperature Sensors | 94-95 | Coolant Temperature Sensor Specs, Overheat Threshold, E-ECU Temperature Input Signal |
| Appendix Standard Harness | 96-97 | Harness Design Requirements, Harness Clamping, CAN Bus Termination |
| Tnv Series Service Tool Operation Manual | 98-100 | Fault Code, Freeze Frame Data, Diagnostic Test, Data Logging, ECU Identification, System Installation |
| Overview | 101 | Service Tool Introduction, Supported ECU Models |
| Installing the Software | 102-103 | System Components, Devices, Usb Driver, Startup Screen |
| Description of the System | 104 | Description of the Program |
| Starting/Quitting the Software | 105-110 | Starting the Software, Quitting the Software |
| Screen Components | 111-115 | Basic Screen, Standard Tool Bar, Operation Tool Bar, Function Select Tool Bar |
| Main Menu | 116-152 | System Information, Fault Code, Freeze Frame Data, Diagnostic Test, Data Logging, Historical Data, ECU Identification, System Installation |
| Graph Function | 153-156 | Setting the Graphs, Graph Operations |
| Print Function | 157 | Print Screen, Print Data Log |
| Tool Functions | 158-160 | System Setting, User Management, Changing a Password |
| Glossary | 161 | Block Size, Controller Area Network, Diagnostic Trouble Code, Engine Control Unit, Freeze Flame Data, Failure Mode Identifier |
| References | 162 | Applicable Models Reference, Regulatory Standards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Fuel injection pump ambient temperature limit | not exceed 80°C | p. 23 |
| Fuel injection pump replacement data | specific injection quantity data (to update E-ECU memory) | p. 23 |
| Injector pump data/reprogramming item: Correction information | Pump injection quantity correction value | p. 49 |
| Accelerator sensor rated voltage | 5 Vdc±0.01V | p. 88 |
| Accelerator sensor total resistance (sensor alone) | 5 ± 1.5kΩ | p. 88 |
| E-ECU operating ambient temperature | -30°C ~ 80°C | p. 30 |
| E-ECU storage ambient temperature | -40°C ~ 110°C | p. 30 |
| E-ECU Rated Voltage | 12 Vdc | p. 30 |
| 3TNV82A-Z | ||
| Engine Displacement, 3TNV82A-Z | 1.331 L | p. 6 |
| 3TNV84T-Z | ||
| Engine Displacement, 3TNV84T-Z | 1.496 L | p. 7 |
| 4TNV88-Z | ||
| Engine Displacement, 4TNV88-Z | 2.189 L | p. 11 |
| 4TNV98-Z(R80-7A) | ||
| Engine Displacement, 4TNV98-Z(R80-7A) | 3.318 L | p. 13 |
