HINT
- DTCs P2195 and P2196 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
- DTCs P2197 and P2198 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
- Bank 1 refers to the bank that includes cylinder No. 1.
- Bank 2 refers to the bank that does not include cylinder No. 1.
- When any of these DTCs are set, check the air fuel ratio sensor output voltage by entering the following menus: Powertrain /
Engine / Data List / A/F Control System / AFS Voltage B1S1 or AFS Voltage B2S1.
- Short-term fuel trim values can also be read using the Techstream.
- The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a constant level. Therefore, the
air fuel ratio sensor output voltage cannot be confirmed without using the Techstream.
- If an air fuel ratio sensor malfunction is detected, the ECM sets a DTC.
MONITOR DESCRIPTION
- Sensor voltage detection monitor
- Under the air fuel ratio feedback control, if the air fuel ratio sensor output voltage indicates rich or lean for a certain period of time, the ECM
determines that there is a malfunction in the air fuel ratio sensor. The ECM illuminates the MIL and sets a DTC.
- Example:
- If the air fuel ratio sensor voltage output is less than 2.8 V (very rich condition) and heated oxygen sensor output voltage falls from 0.59 V
or more to less than 0.21 V for 5 seconds, the ECM sets DTC P2196 or P2198. Alternatively, if the air fuel ratio sensor voltage output is
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