49E2

49E2 - P20B5

Information saved in
DDE

Fault code
49E2 - P20B5

Fault text
DDE: Heating, SCR system, power peaks: maximum heat
output too high

Fault description
Monitoring peak power in reduction agent pressure line
heater. A short circuit is recognized when the peak heater
output is above a limit value defined based on operating
point and the peak power test has been completed.
The peak power test is terminated when one of the following
conditions is met:
- An activation signal has been transmitted to the heater for
at least 10000 ms.
- When the peak power test has been recognized as
terminated based on the shift in the heater's power.

Condition for fault identification
Test condition:
The error check runs once the peak power test has been
completed.
Voltage condition:
The error check runs once the peak power test has been
completed.

Condition for fault memory entry
Event debounced (1)

Action in service
1. Check resistance of heater elements.
2. Check heater wires for short circuits to ground.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none