P013C-O2 SENSOR 2/2 SLOW RESPONSE – RICH TO LEAN
Theory of Operation
The downstream O2 Sensor is located in the exhaust path behind the catalytic converter, is monitored for proper response to assure optimum catalytic converter efficiency. The downstream O2 response monitor is intended to diagnose a downstream O2 sensor that is not moving or stuck in a voltage window and to insure accurate information for catalyst monitor diagnosis.
Vehicle is started and driven between 32 and 88.5 km/h (20 and 55 mph) with the Throttle open for a minimum of 120 seconds. Coolant greater than 70° (158° F). Catalytic Converter Temp greater than 600° C (1112° F) and EVAP Purge is active.
The oxygen sensor signal voltage switches less than 16 times from lean to rich within 20 seconds during monitoring. One Trip Fault. Three good trips to turn off the MIL.
(K243) O2 2/2 SIGNAL CIRCUIT
(K904) O2 RETURN DOWNSTREAM CIRCUIT
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