Volvo TAD734GE Diesel Engine Operating Manual

Volvo TAD734GE Diesel Engine Operating Manual

This Operator's Manual concerns the Volvo TAD734GE engine, an inline 6-cylinder direct-injection diesel engine. The engine is equipped with a common rail fuel injection system, IEGR (internal exhaust gas re-circulation), electronically- controlled fuel management (EMS 2), a turbocharger, a thermostatically-controlled cooling system and electronic speed control.

Presentation

EMS (Engine Management System)

EMS is an electronic system with CAN communication (Controller Area Network) for diesel engine control. The system was developed by Volvo and includes fuel control and a diagnostic function.

Summary

The system comprises such items as a control unit, sensors and injectors. The sensors send input signals to the control unit, which in turn controls the injectors.

The information from the sensors gives exact data about prevailing operating conditions and allows the processor in the control module to calculate the correct injection amount, injection timing and check engine health.

Input signals

The control unit receives input signals about engine operating conditions from the following components

- coolant temperature sensor

- charge air pressure and temperature sensor

- rpm sensor, camshaft

- rpm sensor, flywheel

- coolant level sensor

- oil pressure sensor

- fuel pressure sensor

- water-in-fuel indicator

- fuel pressure in distributor manifold

Output signals

The control module uses the input signals to control the following components:

- unitinjectors

- starter motor

- main relay

- pre-heating relay

MPROP, high pressure fuel pump

Fuel control

The engine fuel requirement is analyzed up to 100 times per second. The amount of fuel injected into the engine and the injection advance are fully electronically controlled via fuel valves on the unit injectors.

This means that the engine always receives the correct volume of fuel in all operating conditions, which provides lower fuel consumption and minimal exhaust emissions etc.

Diagnostic Function

The task of the diagnostic function is to detect and locate disturbances within the EMS 2 system, to protect the engine, and to provide information about problems that arise.

If a malfunction is detected, it is announced by warning lamps, a flashing diagnostic lamp or in plain language on the instrument panel, depending on the equipment used. If a fault code is obtained as a flashing code or in plain language, it is used for guidance in any fault tracing. Fault codes can also be read by the Volvo VODIA tool at authorized Volvo Penta workshops.

If there is a serious malfunction, the engine will shut down altogether, or the control unit will reduce the power output (depending on application). Here too, a fault code is set for guidance in any fault tracing.

Instruments and Controls

Display Control Unit

The DCU control panel is available as an optional accessory for the EMS (Engine Management System) electronic control system.

The DCU is a digital instrument panel which communicates with the Volvo engine control unit. The DCU has several functions, such as engine control, monitoring, diagnostics, and parameter setting.

The menus in the DCU system can be used to check and in some cases to set, a number of different functions in the EMS system.

NOTICE! Settings and what engine data that appears in the display may vary depending on installation and engine model.

NOTICE! The menus and illustrations shown here are the English version. The language can be changed, however; refer to the Setup menu.