Electric characteristic
Measured value =
5±0.2 V
Repeat the wiring and sensor continuity checks.
YES go to 18
18
Electric characteristic
Measured value =
0 V
Repeat the sensor and circuit earth insulation
check.
YES go to 19 NO go to 20
19 - Check the control unit connector.
Check the control unit power supply.
Replace the control unit, if necessary.
20 - Repair or replace the cable harness.
21 - Start the engine and check that voltage de-
creases gradually according to the temperature
increase as per table.
YES go to 22 NO go to 23
22 - The temperature signal is conforming.
23 - Replace the temperature sensor.
N.B.
FOR A MORE ACCURATE CHECK OF THE
SENSOR, REMOVE IT FROM THE ENGINE AND
CHECK ITS RESISTANCE AT CONTROLLED
TEMPERATURE.
USING A SUITABLE CONTAINER, IMMERSE
THE METAL PORTION OF THE SENSOR IN
WATER, HEAT GRADUALLY AND READ THE
TEMPERATURE AND RESISTANCE VALUES.
CHECK THE MATCHING AS PER TABLE
Intake air temperature sensor
Electric characteristic
TERMINALS: 18 - 22
CONDITIONS: Intake air temperature 20°
STANDARD: With connected sensor: 3750 ± 200 Ω
Nexus 500 euro 3 Injection
INJEC - 265
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