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 reference circuit. When measured with a 10 megohm 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 frequency of HO2S Bank 1 Sensor 1 indicates that the sensor is active and the system is operating in Closed Loop, but the voltage, or amplitude, of the signal remains within a calibrated range, DTC P0130 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTC's P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P1121, P1122, P0131, P0132, P1106, P1107, P1114, or P1115 are not set.
^ The engine is running for at least 2 minutes.
^ The Engine Coolant Temperature (ECT) is at least 75°C (167°F).

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

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns the MIL OFF after 3 consecutive drive trips during which the diagnostic runs and passes.
^ A last test failed, or the current DTC, clears when the diagnostic runs and passes.
^ A History DTC clears after 40 consecutive warm-up cycles, if no other emission related diagnostic failures are reported.
^ Use a scan tool in order to clear the MIL diagnostic trouble code.
^ Interrupting the PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Powertrain Control Module (PCM) Description, Clearing Diagnostic Trouble Codes.

DIAGNOSTIC AIDS

NOTE: Refer to Connector Test Adapter Kit J 35616-A Notice in Service Precautions

Check for a malfunctioning HO2S heater or heater circuit. With the ignition ON and the engine OFF, the HO2S voltage displayed on the scan tool should gradually drop below 250 mV or rise above 600 mV. If this does not occur, disconnect the HO2S and connect a test lamp between the HO2S ignition 1 voltage circuit and the heater low control circuit. If the test lamp does not light, repair the open ignition 1 voltage or sensor ground circuit as necessary. If the test lamp lights and the HO2S high signal circuit and the HO2S low reference circuit are OK, replace the HO2S. Refer to Heated Oxygen Sensor (HO2S) 1 Replacement.

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

If the problem is intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-6:

Steps 7-13:

Steps 14-18:

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 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 reference circuit and PCM ground.
13. This step checks for proper circuit resistance between the HO2S low reference 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.