P0050
DTC P0050CIRCUIT DESCRIPTION
Heating elements inside the heated oxygen sensors (HO2S) minimize the time required for the sensors to reach operating temperature and provide an accurate voltage signal. The powertrain control module (PCM) controls the HO2S heater operation with a low side driver. The sensors receive power from a fused ignition 1 voltage circuit. If the PCM detects that an HO2S heater low control circuit condition is incorrect, the following DTCs will set:
- P0030 for Bank 1 Sensor 1
- P0036 for Bank 1 Sensor 2
- P0050 for Bank 2 Sensor 1
CONDITIONS FOR RUNNING THE DTC
- The ECT Sensor parameter is more than 60°C (140°F).
- The MAF Sensor parameter is between 5-30 g/s.
- The Engine Speed parameter is between 500-3000 RPM.
- The Engine Run Time parameter is more than 3 minutes.
- The system voltage is between 10-18 volts.
CONDITIONS FOR SETTING THE DTC
The PCM detects the heater circuit is open or shorted.
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.
- Clear the MIL and the DTC with a scan tool.
TEST
