Circuit Description

Powertrain Control Module (PCM) continuously monitors Oxygen Sensor 1 (O2S 1) activity for 100 seconds. During the monitor period, PCM counts number of times than O2S 1 switches from rich-to-lean and from lean-to-rich. If total number of switches is less than calibrated value, a DTC P1133 will set.

DTC will set under the following conditions: DTC(s) P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0200, P0300-P0304, P0341, P0404, P0506, P0507, P0601 and P0602 not set, engine speed 1600-2600 RPM, TP sensor angle 9-20 percent. EVAP emission control system commanded open for greater than 36 percent Pulse Width Modulated (PWM), purge learned memory greater than 191 and conditions are present for at least 100 seconds.