46DE - P20C0 (DDE)

46DE - P20C0

Information saved in
DDE

Fault code
46DE - P20C0

Fault text
DDE: Reducing-agent pressure-line heating diagnosis,
signal: Short circuit to positive

Fault description
Metering wire/delivery module 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 circuit.
4. Inspect fuse.
5. Use diagnostic system to test heating systems.
6. Replace power switch.
7. Replace metering line heater.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Heater circuit 2 is for the metering wire and delivery
module.
Perform electrical checks of resistances in heater circuit at
power switch. Heater circuit metering wire specifications:
E70: 3.8 - 4.4 ohms
E90: 1.5 - 1.7 ohms
Heater circuit delivery module specifications:
2.9 - 5.5 ohms