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1.5L REVOTORQ ENGINE
209
-0.029
CONNECTOR DETAIL
PINOUT DETAILS
Pin No
Description
1
Switch 1
2
Switch 1 GND
3
Switch 2
4
Switch 2 GND
5
ACC LED
6
IGN LED
7
BACK LIGHT (-)
8
BACK LIGHT (+)
9
RING VEH GND (-)
10
RING LED (+)
xvii. AC PRESSURE SENSOR
The pressure in the system is monitored by a
Trinary pressure switch. The Trinary pressure
switch triggers at 3 pressure values and sends
request to Engine EMS ECU for compressor shut
OFF or to increase radiator fan speed depending
on system pressure.
Trinary pressure switch is provided on the high
pressure tube liquid line of the refrigerant and it is
functionally connected to engine EMS to control
the AC compressor and radiator/ condenser fan
through the Engine EMS. It also gives a feedback
to the Control panel in case of its intervention.
It has the following three functions:
1. Low Pressure Shut OFF: When the pressure
drops below 0.196 ± 0.02 MPa, indicating a
leakage, the compressor is shut OFF. It
switches ON the compressor again after the
system pressure reaches 0.225
+0.025
2. Middle Pressure detection: When the system
pressure reaches 2.01 ± 0.1 MPa it requests
Engine EMS to run the radiator/ condenser fan
at a higher speed. When the pressure drops
below 1.52 ± 0.15 MPa the fan is requested to
run at normal speed.
3. High pressure shut OFF: When the pressure
rises above 3.14 ± 0.2 MPa, indicating a
pressure build up, the compressor is shut OFF.
It switches ON the compressor again after the
system pressure drops below 2.25 MPa.