49ED - P202A (DDE)

49ED - P202A

Information saved in
DDE

Fault code
49ED - P202A

Fault text
DDE: Reducing-agent active-tank heating: Short circuit,
heater circuit

Fault description
Active tank heater monitoring. When the heater is
deactivated the measured current draw of the active tank
heater should not be above the limit value 100 uA. If the
measured current draw is not above the limit value, this
indicates a short circuit and a diagnostic trouble code is
logged.

Condition for fault identification
Test condition:
The error check runs continuously when the active tank
heater is deactivated.
Voltage condition:
The error check runs continuously when the active tank
heater is deactivated.

Condition for fault memory entry
Debounce (15000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Replace power switch.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Check the control-activation wire for a short circuit to
ground. The power switch transmits an activation signal to
all heaters. The first heater circuit is for the active tank
heater, the second heater circuit is for the delivery module
and the metering line.
The control-activation wire should have no continuity with
either ground or positive when disconnected from the DDE
and the power switch.