DTC Advanced Diagnostics: P2237
DTC P2237:Air/Fuel Ratio (A/F) Sensor (Sensor 1) IP Circuit High Voltage General Description
USA and Canada models
Mexico models
The air/fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The A/F sensor (sensor 1) transmits a signal to the powertrain control module (PCM), and the PCM controls fuel injection duration by comparing the target air/fuel ratio with the A/F sensor (sensor 1) signal. If the IP terminal voltage is within a specified range when the A/F sensor (sensor 1) pump cell voltage is excessively high, the PCM detects a malfunction and stores a DTC. Monitor Execution, Sequence, Duration, DTC Type
Enable Conditions
Malfunction Threshold
The IP terminal voltage is between 1.93 V to 2.07 V for at least 15 seconds. Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Confirmation Procedure
Operating Condition
With the HDS
None. Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored. Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery. |