P2243

41D7 - P2243

Information saved in
DDE

Fault code
41D7 - P2243

Fault text
DDE: Oxygen sensor, signal, Nernst voltage: Open circuit

Fault description
An open circuit error is detected in the Nernst voltage when
the resistance of the signal voltage lies above the threshold
3000 mV or the raw O2 value lies above the maximum
threshold 1500 mV or below the minimum threshold -
1300 mV.
The raw O2 voltage signal should equal roughly 3.3 V or 0
V when an error is present.

Condition for fault identification
Test condition:
Check frequency is continuous in accordance with the
programmed time grid.
To activate the open circuit error test the following
conditions must be satisfied:
- The sensor temperature is valid and continuously exceeds
the operating temperature for 10 s.
- The vehicle is not in trailing throttle/overrun, debounce
implemented with 100 ms and 100 ms.
- The battery voltage is above 10700 mV, debounce
implemented with 0 ms and 2000 ms.
- No error related to low battery voltage at the chip or SPI
communications error is present.
- The hot oxygen sensor tests are enabled.
The current error status for open circuit is registered as soon
as the Ri signal voltage debounced with 0 ms and 0 ms
exceeds the threshold 3000 mV.
After the period 2 s the open circuit error test is enabled for
the time 2000 ms.
Once 2000 ms has elapsed the test is again deactivated.
Voltage condition:
Check frequency is continuous in accordance with the
programmed time grid.
To activate the open circuit error test the following
conditions must be satisfied:
- The sensor temperature is valid and continuously exceeds
the operating temperature for 10 s.
- The vehicle is not in trailing throttle/overrun, debounce
implemented with 100 ms and 100 ms.
- The battery voltage is above 10700 mV, debounce
implemented with 0 ms and 2000 ms.
- No error related to low battery voltage at the chip or SPI
communications error is present.
- The hot oxygen sensor tests are enabled.
The current error status for open circuit is registered as soon
as the Ri signal voltage debounced with 0 ms and 0 ms
exceeds the threshold 3000 mV.
After the period 2 s the open circuit error test is enabled for
the time 2000 ms.
Once 2000 ms has elapsed the test is again deactivated.

Condition for fault memory entry
Debounce (500 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
Replace oxygen sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none