SCR SYSTEM WARNING ALARM [SKYACTIV-D 2.2]

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Purpose

• When any of the following conditions is met, the SCR system warning alarm warns the driver of a malfunction.

― There is low or excess AdBlue^®

― Fluid in urea tank is detected other than normal AdBlue^®

― SCR system malfunction

Function

• When the instrument cluster receives the SCR system warning alarm request signal sent from the PCM via the CAN signal, the SCR system warning alarm sounds.

• The SCR system warning alarm sound pattern is as shown in the figure.

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Construction

• The SCR system warning alarm sounds using the buzzer built into the instrument cluster.

1. The instrument cluster receives (1) the SCR system warning alarm request signal from the PCM.

2. The instrument cluster microcomputer turns the transistor on (2) based on the SCR system warning alarm request signal.

3. When the transistor turns on, a ground circuit with the alarm is established and the alarm sounds (3).

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Fail-safe

• Not applicable