DTC P2237: General Description
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.