Land Rover Lesson 2 Auto Trans Coolingine Rover Manual
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•Understand the function and operation of electronic variable geometry turbo charger (VGT) •Understand how the variable vanes operate in service and the default conditions •Locate the engine emission control system components on the 4.0 liter V6 petrol engine •Identify the engine emission control system components on the 4.0 liter V6 petrol engine •Explain the operation of the engine emission control system components on the 4.0 liter V6 petrol engine •Identify the engine emission control components and their locations •Explain the operation of the engine emission control system •Identify and locate the engine emission control components on the TDV6 engine •State the operation of the engine emission control system •Identify the components in the EVAP emissions system •Locate the EVAP components on the vehicle •Describe the function and operation of the EMS components •Identify component location on the vehicle •Explain any servcing requirements •Identify the engine management system components and their locations •Explain the operation of the engine management system •Diagnose engine management faults •Understand the key design features •Understand the special requirements for servicing •Understand the key design features •Understand the special requirements for servicing •Identify the four-wheel drive system components •Explain which four-wheel drive system components are serviceable •Be able to locate service tools from the GTR database •Locate the fuel system related components on the vehicle •Understand the function and operation of the fuel tank internal components •Understand the operation of the fuel tank level sensors •Understand the operation of the fuel pump module & fuel filter •State which components are serviceable •Identify the location of the diesel fuel system components •Understand the operation of the low pressure fuel system (G420493) Technical Training14 Lesson 2 – PowertrainObjectives
•Understand the operation of the fuel pump module •State which components are serviceable ObjectivesLesson 2 – Powertrain 15Technical Training (G420493)
Oil feed pipe1 LH exhaust manifold2 Actuator motor3 Actuator lever4 Oil return pipe5 Turbocharger6 The variable vane turbocharger, fitted to the LH exhaust manifold of the TdV6 engine, makes it possible to vary the exhaust gas flow of the turbine, dependent on engine operation. This improves the power transfer to the turbine wheel and compressor, particularly at low engine speeds, thus increasing the boost pressure. The guide vanes are opened progressively as the engine speed increases so that the power transfer always remains in balance with the required charger speed and the required boost pressure level. Variable vanes facilitate better use of the exhaust gas energy so as to further improve the efficiency of the turbocharger and thus of the engine, compared to the more conventional wastegate control. Advantages: •High torque at both high and low engine speeds •Continuous and optimum adjustment for all engine speeds •No wastegate valve required, exhaust energy is better utilised, less back-pressure in conjunction with same compressor work •Low thermal and mechanical load improves engine power output •Low emissions •Optimised fuel consumption over the entire engine speed range The turbochargers construction is similar to the unit fitted to the Freelander Td4 engine. However, a stepper motor instead of a vacuum diaphragm electronically controls the variable vanes. The DC rotary actuator motor operates a drive shaft. The drive shaft is connected to the vanes by an actuating lever. Adjustment of the vanes is achieved by moving the actuating lever. When the drive shaft is turned, a signal is created at the end of the drive shaft; this feedback signal is used to determine the angular position of the vanes. This information is transmitted to the Engine Control Module (ECM). There is a temperature sensor in the control unit, which drives the stepper motor to a safe position (vanes fully opened) if the maximum temperature is exceeded. The ECM detects any malfunctions in the stepper motor and generates Diagnostic Trouble Codes (DTC). (G421109) Technical Training164 Lesson 2 – PowertrainTurbocharger
Closed (fast)A Open (slow), default positionB Turbine1 Vanes2 Actuator lever3 At low engine speeds, because of the flat setting of the vanes, the relatively low flow of exhaust gases are accelerated and routed in such a way that they meet the vanes of the turbine wheel at the outermost edge. Consequently, a high torque is produced at the turbine wheel, and a high turbine speed is therefore achieved. At high engine speeds the vanes are progressively opened, so that a large flow of exhaust gas is delayed and is directed more and more towards the centre of the turbine wheel. The torque at the turbine wheel is artificially lowered. In this way the turbine speed, and therefore the air quantity required by the engine, are matched to engine speed. Consequently, the boost pressure is approximately constant over the whole engine speed range. The operating parameters are controlled electronically by the ECM using powertrain sensors and driver inputs. The turbocharger is designed for fail safe operation. If a fault occurs regarding the control of the unit, the vanes default to the fully open position so as to produce minimum boost. TurbochargerLesson 2 – Powertrain 165Technical Training (G421109)