P0422-Catalytic 1/1 Efficiency: Notes

Fig 1: Upstream O2 Sensors & Air Pump Switchover Solenoid Circuit Schematic

Courtesy of CHRYSLER LLC

1. When Monitored  : The Powertrain Control Module (PCM) monitors the engine at operating temperature, in closed loop, engine load between 22-52%, the Three Way Catalytic (TWC) converter temperature is greater than 380°C (716°F), and no O2 Sensor or engine misfire faults.
2. Set Condition  : The amplitude of the O2 Sensor Signal downstream of the TWC exceeds 75% of the amplitude of the O2 Sensor Signal upstream of the TWC for approximately 170 seconds.

For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .