VOLVO
ECM-1802 - Intake air temperature (IAT) sensor. Signal too low
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerS40 (1996–2004), V40 (1996–2004)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
The ECM monitors the signal wire from the intake air temperature sensor. If the fault shows the signal is too low, the control module uses a fixed value for the air temperature instead.
Mulige årsaker
- Signal wire short-circuited to ground
- Defective intake air temperature sensor
Hva du kan gjøre
- 1Switch off the ignition and check the connector on the mass air flow sensor, which has the intake air temperature sensor built in, for play and oxidation
- 2With a multimeter, check that the signal wire from the sensor is not shorted to ground
- 3If you have a diagnostic tool: read the air temperature in live data and check that it matches the surrounding air
- 4If the fault remains, have a workshop check or replace the mass air flow sensor, since the temperature sensor is built into it
Symptomer du kan merke1
- No noticeable symptoms for the driver
Hva feilen kan påvirke1
- The control module uses a fixed value for the air temperature
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