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 Yanmar Yanmar TNV Series (R55/R80-7A) 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 |
Yanmar Yanmar TNV Series (R55/R80-7A) Common Problems This Manual Covers
Runs rough after injection pump replacement
Yanmar requires the pump injection quantity correction value to be written to the E-ECU whenever the fuel injection pump is replaced. Skip that step and the engine idles rough or lacks power even with a good new pump. The Control System section covers the precaution and the data that has to go into ECU memory.
Manual Section: Control System p. 20Warning lamp with no obvious cause
On these electronically governed TNV engines a lamp with drivability loss means the E-ECU has logged something, and swapping parts blind gets expensive fast. The Main Menu chapter shows how to pull fault codes, freeze frame data and historical data with the service tool before you touch a component.
Manual Section: Main Menu p. 116Intermittent stalling from harness or CAN faults
A chafed harness or missing CAN bus termination produces ghosts: the engine stalls or stumbles, then tests fine in the yard. The harness appendix sets out design requirements, clamping practice and CAN bus termination so you can check the wiring against what Yanmar intended.
Manual Section: Appendix Standard Harness p. 96Erratic engine speed or throttle response
Surging or an engine that ignores the throttle often traces to the accelerator sensor or its wiring rather than fuel. The manual gives the sensor's rated 5 Vdc supply and a total resistance of 5 kOhm plus or minus 1.5 kOhm, so you can condemn or clear it with a meter.
Manual Section: Control System p. 20Hard starting in cold weather
Cold no-starts on these engines frequently come down to the starting aid circuit rather than the starter itself. The Control System section covers the starting aid relay arrangements for the 400 W, 500/800 W and 1000 W air heaters, plus the starter and main relay specifications.
Manual Section: Control System p. 20Service tool will not connect
A diagnostic session that dies at the laptop is as much downtime as a dead engine. The software installation chapter covers the system components, devices and USB driver setup needed to get the service tool talking to the ECU.
Manual Section: Installing the Software p. 102Faults that vanish before you catch them
An engine that derates under load but behaves in the yard needs to be watched, not inspected. The graph function chapter shows how to set up and operate live parameter graphs alongside the tool's data logging, so the glitch is on screen when it happens.
Manual Section: Graph Function p. 153Frequently Asked Questions
Which engines and machines does this manual cover?
It covers the Yanmar TNV engines used in 5 to 8 ton -7A series mini excavators: 3TNV82A-Z, 3TNV84T-Z, 3TNV88-Z, 3TNV88-E, 4TNV84T-Z, 4TNV88-E, 4TNV98T-Z, 4TNV98-Z (R80-7A) and 4TNV98-E (R55-7A, R55W-7A).
Is this a full engine service manual?
No. It is the electronic control manual: E-ECU, fuel injection pump control, EGR valve, sensors, relays, harness and the service tool software. It is the book for diagnosing control system faults, not for mechanical teardown or rebuild procedures.
Do I need to do anything to the ECU after replacing the fuel injection pump?
Yes. The Control System section states that when the pump is replaced, the pump injection quantity correction data must be written to the E-ECU, and it notes limits such as keeping pump ambient temperature under 80 degrees C. Fitting a pump without the data rewrite leaves the engine running poorly. p. 20
Does it explain how to use the Yanmar service tool?
Yes. Pages 98 onward are the TNV service tool operation manual: installing the software, screen layout, and using the main menu for fault codes, freeze frame data, diagnostic tests, data logging and ECU identification. p. 98
How will I receive this Yanmar 3TNV84T-Z & variants Electronic Control Manual?
You get a 162-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Yanmar 3TNV84T-Z & variants Electronic Control Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are there wiring harness diagrams in this Yanmar 3TNV84T-Z & variants manual?
Yes, this Yanmar 3TNV84T-Z & variants Electronic Control Manual includes a wiring diagram for the electrical system.
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