P1133
DTC P1133 or P1153
Circuit Description
The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) activity for 60 seconds. During this period, the PCM counts the number of times that the HO2S switches form rich to lean, and from lean to rich. A DTC P1133 or a DTC P1153 sets when the PCM determines that the HO2S did not switch enough times.
A lean-to-rich) switch is determined when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean switch is determined when the HO2S voltage changes from more than 600 mV toless than 300 mV.
DTC Descriptors
This diagnostic procedure supports the following DTCs,
- DTC P0133 HO2S Slow Response Bank 1 Sensor
- DTC P0153 HO2S Slow Response Bank 2 Sensor
Conditions for Running the DTC
- DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0131. P0132, P0134, P0135, P0151, P0152, P0154, P0155, P0200, P0300, P0443, P0496, P1111, P1112, P1114, P1115, P1121, or P1122 are not set.
- The engine coolant temperature (ECT) is more than 60"C (140°F).
- The ignition 1 signal is between 10-18 volts.
- The 1001) status is CLOSED.
- The engine speed is between 1,200-3,000 RPM.
- The engine air flow is between 20-55 grams per second.
- The evaporative emission (EVAP) purge solenoid is more than 0 percent.
- The engine run time is more than 160 seconds.
- The throttle position (TP) is more than 5 percent.
- The fuel tank level remaining is more than 10 percent.
- DTC P1133 and P1153 run once per ignition cycle when the above conditions are met.
Conditions for Setting the DTC
The HO2S lean to rich and rich to lean switches are less than a calibrated amount.
Action Taken When the DTC Sets
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic tails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
- The control module turns OFF the malfunction indicator lamp (M IL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
Test Description
DTC P1133 or P1153 Steps 1-8:
DTC P1133 or P1153 Steps 9-15:
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the condition is present. This test may take 5 minutes for the diagnostic to run.
3. When DTCs P1133 and P1153 are set at the same time, a fuel contamination condition is probably present.
4. An exhaust leak 6-12 inches from the HO2S can cause a DTC to set.
5. This step tests whether a good ground circuit is available.
6. This step tests the integrity of the H02S high signal circuit to the PCM.
7. This step tests the integrity of the H02S high signal circuit to the PCM.
8. Certain RTV silicone gasket materials release vapors that can contaminate the HO2S. Silicone in the fuel can also cause silicone contamination. It the sensors appear to be silicone-contaminated, and if all the silicone sealant is a non-silicone base, advise the customer to try a different fuel company. A missing fuel filler restrictor indicates that the customer may have used leaded fuel.