P1133

Diagnostic Chart 1 Of 2:

Diagnostic Chart 2 Of 2:

Schematic:

CIRCUIT DESCRIPTION
The PCM monitors the heated oxygen sensor (HO2S) activity for 100 seconds. During this test period the PCM counts the number of times that the HO2S signal voltage crosses the rich to lean and lean to rich thresholds. If the PCM determines that the HO2S did not switch enough times, DTC P1133 will set. A lean to rich switch occurs when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich to lean switch occurs when the HO2S voltage changes from more than 600 mV to less than 300 mV.

CONDITIONS FOR RUNNING THE DTC
No throttle position (TP) sensor, evaporative emissions (EVAP) system, misfire, intake air temperature (IAT) sensor, manifold absolute pressure (MAP) sensor, fuel trim, injector circuit, exhaust gas recirculation (EGR) pintle position, mass air flow (MAF) sensor, engine coolant temperature (ECT) sensor, crankshaft position (CKP) sensor, or heated oxygen sensor (HO2S) 1 heater circuit DTCs are set.
^ The mass air flow is between 10-30 g/s.
^ The ECT is more than 50°C (122°F).
^ The engine run time is more than 60 seconds.
^ The engine speed is between 1000-3000 RPM.
^ The engine is running in closed loop.

CONDITIONS FOR SETTING THE DTC
^ The above conditions are present for a 100 second monitoring period.
^ The PCM monitors fewer than 40 rich to lean and 40 lean to rich switches for HO2S 1.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the MIL during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores the conditions that were present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns the MIL OFF during the third consecutive trip in which the diagnostic runs and passes.
^ The history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear Information function or by disconnecting the PCM battery feed.

DIAGNOSTIC AIDS
A malfunction in the HO2S heater ignition feed or ground circuit may cause the DTC to set. Check the HO2S heater circuitry for intermittent malfunctions or poor connections. If connections and wiring are OK and the DTC continues to set, replace the HO2S 1.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition occurs that caused the DTC to set. This may assist in diagnosing the condition.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. When the system is operating correctly the HO2S voltage should toggle above and below the specified values.
5. If the low circuit is shorted to ground the HO2S voltage will be less than 400 mV when the signal circuit is jumped to ground.
6. The specified value is what is measured on a correctly operating system.
7. The specified value is what is measured on a correctly operating system.
14. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.