DTC Detection Logic
To judge malfunctions, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal fluctuates according to fuel feedback control.
|
DTC No. |
Trouble diagnosis name (Trouble diagnosis content) |
DTC detecting condition |
Possible Cause |
|
|
P2251 |
O2 sensor bank 1 sensor 1 (O2 sensor negative current control circuit/open bank 1 sensor 1) |
A) |
The A/F signal computed by ECM from the A/F sensor 1 signal is constantly in a range other than approx. 2.2 V. |
|
|
B) |
The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 2.2 V. |
|||
|
P2254 |
O2 sensor bank 2 sensor 1 (O2 sensor negative current control circuit/open bank 2 sensor 1) |
A) |
The A/F signal computed by ECM from the A/F sensor 1 signal is constantly in a range other than approx. 2.2 V. |
|
|
B) |
The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 2.2 V. |
|||