P1133

Wiring Diagram:

After achieving closed loop fuel control, a commanded air fuel ratio of 14.7:1, RPM between 1500 and 3200 and air flow between 7 and 25 grams per second the PCM will continuously monitor the front oxygen sensor signal for 100 seconds. During this time the PCM counts the number of rich to lean and lean to rich switches. To be considered a switch the voltage must go below 300 mv and above 600 mv. The PCM also keeps track of the time it takes to make the switch. The number of switches along with the time to achieve these switches are used to calculate the average response time to perform each switch. Also this information is used to calculate if the proper ratio of the switches is correct. The three diagnostic trouble codes listed below are used to identify different types of faults that can occur with oxygen sensors.

DTC PARAMETERS
P1133 - Too Few Rich To Lean and Lean To Rich Switches - If less than 10 switches take place during the test this code will set.

DIAGNOSTIC AIDS
Repair Procedure
1. The oxygen sensor wiring and connections should be checked if any of these DTCs are set because corrosion or loose connections could cause these DTCs to set.
2. The most likely cause of setting any of these DTCs is contamination. This contamination could be caused by fuel, improper use of RTV sealant, engine oil, or coolant contamination.
3. The source of contamination should be identified and corrected before replacing the sensor.