Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 56. INSTRUMENTATION DRIVER INFO 02. Outside Air Temperature Display
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W1860BE.book Page 18 Tuesday, January 28, 2003 11:01 PM
OUTSIDE AIR TEMPERATURE DISPLAY
INSTRUMENTATION/DRIVER INFO
2. Outside Air Temperature Display
A: CONSTRUCTION
The outside air temperature display system consists of an ambient sensor, the CUSTOM CPU and
a liquid crystal display installed in the combination meter. The ambient sensor detects the outside
air temperature using the built-in thermistor which varies its resistance according to change in am-
bient temperature, and sends signals to the CUSTOM CPU.
As soon as the ignition switch is turned ON, the CUSTOM CPU compares the temperature data sent
from the ambient sensor with the one that was stored in its memory when the ignition switch was
turned OFF last time and it causes the lower of the temperatures to be displayed. However, if 60
minutes or more time has passed between the last turning OFF and the next turning ON of the ig-
nition switch, the temperature that is displayed is a sensor-provided temperature.
When the vehicle is running slowly, the heat released from the engine compartment raises the tem-
perature of the air around the ambient sensor and this affects the temperature data the sensor
sends to the CUSTOM CPU. The CPU then makes a special control using the vehicle speed data,
i.e., when the vehicle is running at a speed slower than 10 km/h, the CPU uses the temperature that
was detected during the most recent vehicle's movement at a speed exceeding 10 km/h rather than
a temperature currently being provided by the ambient sensor.
(1)
(2)
IDI00071
(1) Ambient sensor
(2) Outside air temperature display
IDI-18
W1860BE.book Page 19 Tuesday, January 28, 2003 11:01 PM
OUTSIDE AIR TEMPERATURE DISPLAY
INSTRUMENTATION/DRIVER INFO
B: SCHEMATIC DRAWINGS
(3)
(1)
(4)
(2) (5)
(6) (7)
IDI00021
(1) Ambient sensor (5) Combination meter
(2) Thermistor (6) Vehicle speed sensor (MT)
(3) Outside air temperature display (7) Transmission control module (AT)
(4) CUSTOM CPU
IDI-19
W1860BE.book Page 20 Tuesday, January 28, 2003 11:01 PM
OUTSIDE AIR TEMPERATURE DISPLAY
INSTRUMENTATION/DRIVER INFO
MEMO
IDI-20
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