4.2.335. SPN 974, FMI 4, Throttle 3 sensor below normal (IDLE)ΒΆ

Description

The measured throttle sensor signal is below the normal operating range.

Possible causes are:

  • The sensor wiring is defective.
  • Throttle sensor power supply is not correct
  • The sensor is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault. The engine power is reduced to low idle if there is no request from CAN.

Solution

First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the throttle 3 sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the 5 V power supply to the sensor.
  • Check the operation with another throttle sensor to see if throttle sensor is defective.