46AF

46AF - P20A0

Information saved in
DDE

Fault code
46AF - P20A0

Fault text
DDE: Reducing-agent changeover valve, activation: Open
circuit

Fault description
The DDE recognizes a load drop error in the output stage:
Reduction agent switch valve

Condition for fault identification
Test condition:
The error check proceeds continuously according to the
programmed process grid.
Voltage condition:
The error check proceeds continuously according to the
programmed process grid.

Condition for fault memory entry
Debounce (1000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use diagnostic system to activate switch valve.
4. Check switch valve resistance.
5. Inspect fuse.
6. Replace delivery module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Specification for coil resistance in the delivery module: 9-13
ohms.