Aprilia Consumer Service Spa
Technical Service and Training
Release 4 july 99
This material is didactic and
may be changed following the technical
development of the product
ENGINE COOLANT TEMPERATURE SENSOR:
This temperature sensor has a variable resistance
which decreases with the increase in temperature.
The ECU provides the sensor with a +5 Volt signal
and measures the corresponding current, thus
calculating the temperature, based on the
characteristics of the sensor.
Each of the cylinders has one of these sensors,
although only one of them is connected to the ECU
(the other is connected to the control panel).
SW –ECU DIAGNOSIS
EXISTENT
OHMIC DIAGNOSIS
AVERAGE VALUE(20C°) 2700 OHMS (DELTA CAN
BE 300 OHM)
MEASURED BETWEEN WIRES
15 LH CONNECTORS :BLUE RED
6 RH CONNECTORS: RED/BLACK
AIR TEMPERATURE SENSOR:
This temperature sensor has a variable resistance
which decreases with the increase in temperature.
The ECU provides the sensor with a +5 Volt signal
and measures the corresponding current, thus
calculating the temperature, based on the
characteristics of the sensor.
SW –ECU DIAGNOSIS
EXISTENT
OHMIC DIAGNOSIS
AVERAGE VALUE (20C°) 2700
OHMS (DELTA CAN BE 300 OHM)
MEASURED BETWEEN
WIRES
15 LH CONNECTORS :BLUE RED
13 RH CONNECTORS:
RED
/GREEN