P0030

CIRCUIT DESCRIPTION

Engine Control Schematics: Heated Oxygen Sensors (HO2S):

The oxygen sensor heater is a device used to reduce the time that the sensor takes to go active. The PCM uses a high side driver to apply ignition voltage to bank 1 sensor 1 heater, and a low side driver (ODM) to supply the ground path. The PCM monitors the high side driver for circuit conditions that are incorrect for the commanded state of the driver. If the PCM detects an improper circuit condition in the high side driver, DTC P0030 will set.

CONDITIONS FOR RUNNING THE DTC
System voltage is between 9 volts and 18 volts.

CONDITIONS FOR SETTING THE DTC
The PCM detects an incorrect circuit condition in the high side driver for HO2S Bank 1 Sensor 1.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second Consecutive trip in which the diagnostic test runs and tails.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

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

DIAGNOSTIC AIDS

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

If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions

TEST DESCRIPTION

Steps 1 - 5:

Steps 6 - 13:

The numbers below refer to the step numbers on the diagnostic table.
2. This step isolates the condition. If all three DTCs are set, this indicates that one of the heater low circuits are grounded. An internal HO2S condition can also cause all three DTCs to set.
3. This step determines if the bank 1 sensor 1 heater high circuit is shorted to a ground.
7. The bank 1 sensor 1 and bank 2 sensor I are internally connected within the PCM. If the voltage measurement is within the specified range, the bank 2 sensor 1 is causing the condition.