P0130

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) supplies a bias voltage of about 450 mV between the Heated Oxygen Sensor (HO2S) high signal circuit and the HO2S low signal circuit. When measured with a 10-megaohm digital voltmeter, this may display as low as 350 mV. The oxygen sensor signal varies from about 800 mV when the exhaust is rich, to about 50 mV when the exhaust is lean. If the HO2S 1 voltage remains at or near the 450 mV bias for an extended period of time, DTC P0134 is set.

If the signal amplitude of HO2S bank 1 sensor exceeds the no activity (P0134) thresholds but will not allow closed loop operation, DTC P0130 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201-P0206, P0440, P0410, P0440, P0442, P0443, P0446, P0449, and P1441 are not set.
^ The engine running for at least 4 minutes.
^ Engine coolant temperature is at least 70°C (167°F).
^ Engine RPM between 550 and 3,000 RPM.
^ Air flow between 8 and 35 g/s.
^ Throttle angle is between 3 percent and 40 percent.
^ Ignition voltage more than 9 volts and less than 18 volts.

CONDITIONS FOR SETTING THE DTC
The PCM detects an active sensor with an improper HO2S voltage amplitude.

ACTION TAKEN WHEN THE DTC SETS
^ First failure:
- The MIL is not turned ON.
- A DTC is stored in memory under Failed Last Test.
- The Failure Records are stored.
^ Second consecutive drive cycle with a failure:
- The MIL is turned ON.
- A DTC is stored in memory under history.
- The Freeze Frame data is stored.
- The Failure Records are stored.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after the third consecutive trip the diagnostic has run and passed.
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

TEST DESCRIPTION

Steps 1-2:

Steps 3-9:

Steps 10-18:

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks for proper sensor activity. HO2S voltage should rapidly swing above and below the range specified.
4. This step checks the PCM and the high and low signal circuits between the PCM and the HO2S connector for proper operation.
7. This step checks for proper HO2S heater circuit operation up to the HO2S connector.
8. This step checks for proper circuit resistance between the HO2S low signal circuit and PCM ground.
13. This step checks for proper circuit resistance between the HO2S low signal circuit and PCM ground with a COLD sensor. A loose HO2S or poor thread to exhaust electrical contact will cause higher resistance when the HO2S is cold. Although 500 ohms is allowed, typical resistance should be less than 50 ohms.