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CONTROL SYSTEM
2-24
TNV Application Manual
HARNESS
See the standard connection diagram (E3-29927-0040) for harness arrangement. Yanmar has verified the
engine performance with the standard harness. If you want to use a harness other than the standard
harness, consult the standard connection diagram for harness design.
Yanmar has made available the standard harness (12997-91020), but cannot supply customized harnesses
to individual customers.
Harness design requirements
Design and implement the harness according to the following instructions. Neglecting these instructions may
affect the engine performance or result in malfunction of or damage to the E-ECU. See 13 "Electrical
System" for wiring of the battery and starter. See the standard connection diagram (E3-29927-0040) for
harness arrangement.
[Wiring of the E-ECU]
1. Connect GND directly to the battery negative terminal or battery negative terminal cable by single-
point grounding.
2. Supply the main relay with power directly from the battery positive terminal using a cable having a
length of 4 m or less. Failure to do so may affect the noise immunity or cold-start resetting process of
the E-ECU.
3. The total length of the E-ECU power supply line must not exceed 5 m.
4. Avoid common impedance between the power supply circuit of the E-ECU and that of a large current
device such as the starter or air heater. Otherwise, the E-ECU could be reset at cold start.
5. The total length of the rack actuator line must not exceed 10 m.
6. Place the branch of the power supply line for the rack actuator and the EGR valve as close to E-ECU
terminal VB as practicable. Otherwise, transmission noise may be developed.
7. Install a reverse connection prevention diode into the main and sub relays or use the Yanmar specified
relay (198461-52950) in order to protect the E-ECU rack position sensor.
8. Use a twisted-pair cable for the speed sensor. Use a shielded twisted-pair cable for CAN
communication. Otherwise, noise may cause malfunction.
9. When using the CAN terminal resistor inside the E-ECU, connect E30 and E39 with a jumper as short
as possible.
10.Do not connect to the main relay other loads than the E-ECU, rack actuator and EGR valve. Supply E-
ECU external switches and indicator lamps with power through the sub relay.
11.Do not connect 12-volt/3.4-watt or higher lamps directly to the E-ECU.
12.The minimum contact capacity of switches directly connecting to the E-ECU must not exceed 10 mA.
13.Be sure to locate the failure lamp so as to be easily visible to the operator.
14.Do not connect unintended loads to the coolant temperature sensor of the E-ECU. Doing so may
cause CSD or EGR malfunction and deteriorate durability of the engine.
15.When connecting the oil pressure switch (11976-39450) directly to the E-ECU in order to prevent a
trouble due to an abnormal oil pressure, insert a dummy load so as to ensure a 0.1-A or higher contact
current, or use an oil pressure switch with low contact current (124298-39450).
16.Do not connect to E-ECU terminals loads other than intended or specified.
[Wiring of the starting aid]
1. The total length of the starting aid (air heater or glow plug) cable must not exceed 5 m.
00_Electronic_Control_System.book 24 ページ 2006年5月29日 月曜日 午後2時12分
Summary of Contents for Yanmar 3TNV82A-B
Page 95: ...CONTROL SYSTEM 2 76 TNV Application Manual 00_Electronic_Control_System book 76...
Page 96: ...Appendix Standard harness 1 00_ _E fm 1...
Page 97: ...Appendix Standard harness 2 00_ _E fm 2...
Page 98: ...TNV Series service tool Operation Manual...
Page 132: ...32 7 Main Menu Figure 7 15 Data Logging Data Monitor Screen...
Page 145: ...7 Main Menu 45 Figure 7 27 System Installation Configuration Screen...