Operation / operating principle
NTC type sensor (resistance sensor, inversely variable with temperature).
Level in wiring diagram:intake air temperature sensors.
Location:
•
sensor: filter casing front part, on control unit left side.
•
connector: on the sensor.
Electrical characteristics:
Resistance at 0 °C (32 °F): 6 +/- 0.6 kOhm
Resistance at 80 °C (176 °F): 0.290 - 0.390 kOhm
Pin-out:
•
PIN 1: "+" (pink cable): Supply voltage 5V approx.
•
PIN 2: "-" (blue/green cable): Ground connection
AXONE: ELECTRICAL ERRORS
air temperature sensor 1501 - shorted to negative.
Error cause
•
If shorted to negative: voltage equal to zero has been detected at PIN B2 of the control unit
Troubleshooting
•
If shorted to negative, check sensor correct resistance: if resistance = 0, replace the sensor;
if resistance is correct, it means that the pink cable has ground connection: restore the cable
harness
air temperature sensor 1502- open circuit, shorted to positive.
Error cause
•
If the circuit is open, shorted to positive: excessive voltage has been detected at PIN B2 of
the control unit connector.
Troubleshooting
•
If the circuit is open, shorted to positive: check the sensor connector and the Walbro control
unit connector. If they are not OK, restore the cable harness; if OK, check the continuity of
the sensor; if it is not OK, replace the sensor; if it is OK, check the continuity between PIN
B2 of the control unit connector and the PIN of the sensor pink cable: restore cable harness
if there is not continuity; if OK, connect the control unit connector again, and with the battery
connected, check if there is continuity between the PIN of the blue/green cable of the sensor
and the vehicle ground connection: if there is no continuity, restore the cable harness; if
there is continuity, it means that the cause for the error is that the cable is shorted to positive
and now the cable harness between PIN B2 of the control unit and the PIN of the sensor
pink cable (cable harness side) should be restored. If the engine temperature sensor error
Electrical system MXV 450
ELE SYS - 62
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