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.

Conditions for setting this DTC:

• 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.
• Conditions present for at least 100 seconds.
• Number of rich-to-lean counts less than 10 or lean-to-rich counts less than 15.