GENERAL SERVICE INFORMATION
4-10
TNV DI Service Manual
MAIN ELECTRONIC CONTROL COMPONENTS AND FEATURES
Engine diagnosis tool
Allows the operator to troubleshoot the cause of a
problem based on detailed information regarding the
problem occurring in the E-ECU or Eco-governor. This
tool can also be used for data maintenance tasks
including programming and mapping.
See Troubleshooting
Chart on page 7-113
.
Option for service
Engine coolant temperature sensor Allows the CSD and ERG to be controlled in engine cold-
start conditions.
Glow plugs
Air heater
Optional When the key switch is turned to the ON position, the glow
plugs/air heater are/is energized for up to 15 seconds
(glow plugs) or up to 23 seconds (air heater). The duration
of energization depends on the engine coolant
temperature. The HEAT indicator is on during
energization. When the indicator goes out, turn the key
switch to the START position to start the engine.
After heater Optional In extreme cold start conditions, the after heater is
energized for up to 80 seconds or until the coolant
temperature reaches 10°C after the engine has started, in
order to help ensure the engine continues to run without
stall.This option is not available for glow plug engines.
Droop control Standard with VM series Reduces the engine speed by a certain percentage from
no load to full (rated) load in steady state operation. The
same percentage droop is maintained even when the load
increases at any no-load speed.
Isochronous control Standard with CL series
Optional with VM series
Offers a constant engine speed from no load to full load.
The engine speed does not decrease even when the load
increases at any no-load speed.
Low-idling speed up Increases the low-idling speed to up to 1000 rpm
depending on the engine coolant temperature. When the
coolant temperature reaches a predetermined value, this
feature returns the engine speed to the normal low idle
setting, thus reducing the warm-up time.
High-idling speed
down
Optional Decreases the high-idling speed depending on the engine
coolant temperature. When the coolant temperature falls
to a predetermined value, this feature returns the engine
speed to the normal high idle setting, thus minimizing the
emission of white smoke at low temperatures.
Auto deceleration Optional Brings the running engine in low idle mode automatically
when the accelerator pedal is not operated for a
predetermined period of time. When the pedal is
operated, i.e., the accelerator sensor is activated, the low
idle mode is cancelled.
Component/Feature Description
TNV_DI_SM_A4.book 10 ページ ２００７年１２月６日 木曜日 午前９時２３分
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