496D - P2201 (DDE)
496D - P2201Information saved in
DDE
Fault code
496D - P2201
Fault text
NOx sensor before DeNOx catalytic converter, NOx
plausibility :
Fault description
Monitoring of NOx offset learning function at NOx sensor 1
(before SCR). The error is recognized when the learned
NOx offset value ppm falls below the limit -20 ppm.
Condition for fault identification
Test condition:
Continuous according to defined time grid when the offset
test is enabled:
- Enabled in application 0== 0.
- The test is executed with a falling flank of .
and when the following conditions are satisfied:
- The absolute difference between the maximum ppm and
minimum ppm NOx offset value is less than 2 ppm.
- ppm is greater than 0 ppm.
- The averaged offset value ppm lies within the monitoring
window -30 ppm and 30 ppm.
Voltage condition:
Continuous according to defined time grid when the offset
test is enabled:
- Enabled in application 0== 0.
- The test is executed with a falling flank of .
and when the following conditions are satisfied:
- The absolute difference between the maximum ppm and
minimum ppm NOx offset value is less than 2 ppm.
- ppm is greater than 0 ppm.
- The averaged offset value ppm lies within the monitoring
window -30 ppm and 30 ppm.
Condition for fault memory entry
Debounce (2000 ms)
Action in service
-
Fault effect and breakdown warning
-
Driver information
Warning light:
MIL
Service instruction
-