46D4

46D4 - P202A

Information saved in
DDE

Fault code
46D4 - P202A

Fault text
DDE: Reducing-agent active-tank heating diagnosis, signal:
Short circuit to positive

Fault description
Active tank heater monitoring. When the voltage signal rises
above the maximum limit 3200 mV the diagnostic trouble
code is logged.

Condition for fault identification
Test condition:
The test routine is executed only provided that no other
electrical faults are present. The error check proceeds
continuously according to the defined process running time.
Voltage condition:
The test routine is executed only provided that no other
electrical faults are present. The error check proceeds
continuously according to the defined process running time.

Condition for fault memory entry
Debounce (50 ms)
E90-M57D30T2-AT-LEVII:
Debounce (500 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Check resistances in heating circuits.
4. Inspect fuse.
5. Use diagnostic system to test heating systems.
6. Replace power switch.
7. Check active tank heating system:.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Perform electrical checks of resistances in heater circuit at
power switch. Active tank heating circuit specifications:
1.5 - 2.4 ohms