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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1564 (Engine Controls And Fuel - 3.5L (L66) - DTC P0030 To DTC P0222) >> DTC P0030, P0036, P0050, or P0056 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the operating temperature during extended idle periods. When the ignition is turned to the ON position, ignition voltage is supplied directly to the sensor heater. The powertrain control module (PCM) controls the heater by grounding the control circuit with a solid state device called a driver. If the PCM detects the control circuit voltage is not within a predetermined range when the circuit is commanded ON or OFF, this DTC sets.

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