5.2.14. Sensors and executive mechanisms of the Bosch AS3 system
ELECTRONIC CONTROL DEVICE (ECU)
It is the main component of system, the managing director of timepoint of injection, the increased idling turns, glow plugs, system of repeated combustion of exhaust gases.
The ECU block receives signals from the sensors controlling temperature of cooling liquid, engine turns, work of a fuel nozzle and loading of the engine. These signals are used by the ECU block for management of system.
The ECU block is located in a plastic box which is installed on the right arch of a wheel.
Removal
Before removal of any of elements of fuel system disconnect the negative plug of the accumulator.
Installation
Installation is made in the sequence, the return to removal.
CRANKSHAFT RPM METER
The RPM meter of the crankshaft is located on the forward party of a case of coupling.
It is the inductive generator of impulses creating impulses when passing of teeths of a gear wreath of a flywheel about it.
TEMPERATRURA SENSOR OF COOLING LIQUID
The sensor of temperature of cooling liquid is a thermistor with negative temperature coefficient, that is at increase in temperature of the sensor its resistance decreases.
SENSOR OF ATMOSPHERIC PRESSURE
The sensor of atmospheric pressure is located in the ECU block. This sensor is used to regulate the moment of injection of fuel depending on height.
SENSOR OF ABSOLUTE PRESSURE
The sensor is an integral part of ECU and cannot be removed separately.
LOADING SENSOR
The loading sensor on the fuel pump of high pressure Bosch
The sensor (it is specified by an arrow) consists of a potentiometer whose resistance is measured depending on the provision of a pedal of an accelerator. According to this information of ECU can regulate the moment of injection of fuel depending on the provision of a pedal and engine loading. |
The sensor of loading is installed in the top part of the fuel pump of high pressure. Though it can be removed separately, adjustment of position of the sensor after installation into place requires the special equipment Peugeot. Therefore replacement of this sensor has to be made at the Peugeot station.
SENSOR OF RAISING OF THE NEEDLE OF THE NOZZLE
The sensor of raising of a needle of a nozzle – an integral part of one of fuel nozzles which sends a signal to the ECU block when opening a nozzle.
CONTROL UNIT OF SYSTEM OF PRELIMINARY HEATING
This relay operated by the ECU block, connecting to the ECU block of a glow plug of system of prestarting heating for a certain time at start of the cold engine.
EGR-VALVE
Return of a part of exhaust gases to an inlet collector is run by the ECU block in combination with EGR the electromagnetic valve and the EGR valve. Vacuum from the vacuum pump goes to the EGR valve via the electromagnetic valve according to the frequency of rotation of the engine, loading and height.
Check
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Removal
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Installation
Installation is made in the sequence, the return to removal.
CABLE AND DIAPHRAGM OF MANAGEMENT
Removal
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Installation
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