P0130

CIRCUIT DESCRIPTION
The Heated Oxygen Sensor (HO2S) is a sensor used to detect oxygen-content in the exhaust. The Powertrain Control Module (PCM) supplies the sensor with a signal circuit and a ground circuit. The PCM supplies a bias voltage between the circuits. The sensor varies the voltage based on the oxygen content in the exhaust. When the exhaust stream is lean (more oxygen), the sensor produces a low voltage signal. When the exhaust stream is rich (less oxygen), the sensor produces a high voltage signal. The PCM monitors the HO2S signal during Closed Loop. To correct for rich or lean conditions, the PCM adjusts the injector pulse width.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0106, P0107, P0108, P01 17, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0151, P0152, P0153, P0154, P0201-P0208, P1133, P1134, P1153, or P1154 are not set.
^ The coolant temperature is more than 75°C (176°F).
^ The engine is running for 120 seconds (2 minutes).
^ The system voltage is between 10-18 volts.
^ The predicted O2 heater temperature is 600°C (1112°F).
^ The traction control is inactive.
^ The catalyst protection mode is inactive.
^ The engine speed is between 500-5000 RPM.
^ The MAF is between 3-30 grams per second.
^ The Deceleration Fuel Cut Off (DFCO) is inactive.
^ The Power Enrichment (PE) is inactive.
^ The conditions above are met for 5 seconds.
^ The Closed Loop fuel control is enabled.

CONDITIONS FOR SETTING THE DTC
The vehicle is in Closed Loop fuel control, based on HO2S voltages switching from below 350 mV to above 500 mV.

The PCM monitors the HO2S voltages for 120 seconds (2 minutes).

During the 120-second monitoring period, the voltage remains within 350-500 mV for approximately 16 seconds.

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 fails, 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 (MIL) 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.
^ Use a scan tool in order to clear the MIL and the DTC.

TEST DESCRIPTION

Steps 1-9:

Steps 10-14:

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. The specified value is what is measured on a correctly-operating system.
6. The specified value is what is measured on a correctly-operating system.
12. 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.