P0133

43FD - P0133

Information saved in
DDE

Fault code
43FD - P0133

Fault text
DDE: Oxygen sensor: Dynamics of sensor signal
implausible

Fault description
Dynamic monitoring of oxygen sensor's O2 concentration
rise duration at transition from load to overrun. This rise
duration is also affected by the oxygen sensor's time
constant.
If the oxygen sensor is intact it should not be longer than 3 s.
An error is logged when the measured O2 concentration
during transition from load to overrun rises too slowly, or
when a limit value defined based on the operating point is
not reached once the period LSU_tiWait3_CA has elapsed
following the load/overrun throttle transition.

Condition for fault identification
Test condition:
The test routine is executed during each load-to-overrun
transition when the engine is at a suitable operating point.
The following conditions must be present for the error
check:
- No temporary error is present in the sensor.
When the error check enable is active the state machine for
the error check is executed.
The state machine function is active once all of the
following conditions are satisfied.
- The engine rpm exceeds the limit value 900 1/min
- The injection quantity is above the minimum value
9 mg/hub
- The battery voltage is higher than 10700 mV.
Once all of the following conditions have been satisfied the
state machine function changes to the following status:
For a period of LSU_tiWait1_CA the injection quantity
remains within the tolerance range +/- 4 mg/hub.
The state machine function proceeds to the next status
provided that compliance with one of the following
conditions is present:
- The injection quantity decreases by more than 4 mg/hub.
- The O2 concentration rises above a limit value.
To ensure that a valid load-to-overrun transition is present,
the injection quantity must now, within a period of
LSU_tiWait2_CA, fall to a value below the threshold
0 mg/hub.
It must remain below this threshold until a defect or intact
message is generated. Otherwise the test is aborted and the
state machine becomes inactive.
Voltage condition:
The test routine is executed during each load-to-overrun
transition when the engine is at a suitable operating point.
The following conditions must be present for the error
check:
- No temporary error is present in the sensor.
When the error check enable is active the state machine for
the error check is executed.
The state machine function is active once all of the
following conditions are satisfied.
- The engine rpm exceeds the limit value 900 1/min
- The injection quantity is above the minimum value
9 mg/hub
- The battery voltage is higher than 10700 mV.
Once all of the following conditions have been satisfied the
state machine function changes to the following status:
For a period of LSU_tiWait1_CA the injection quantity
remains within the tolerance range +/- 4 mg/hub.
The state machine function proceeds to the next status
provided that compliance with one of the following
conditions is present:
- The injection quantity decreases by more than 4 mg/hub.
- The O2 concentration rises above a limit value.
To ensure that a valid load-to-overrun transition is present,
the injection quantity must now, within a period of
LSU_tiWait2_CA, fall to a value below the threshold
0 mg/hub.
It must remain below this threshold until a defect or intact
message is generated. Otherwise the test is aborted and the
state machine becomes inactive.

Condition for fault memory entry
Event debounced (2) Number 2 of consecutive defect
detections. In service test diagnosis the debounce is divided
by the factor 2.

Action in service
1. Check wires and plug connections.
2. Check exhaust system for leaks, check installation of
oxygen sensor.
3. If wires and exhaust system are OK:
Replace oxygen sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none