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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0141: Ho2S Heater Performance (Sensor 2) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic procedures.

  1. 2 -  As the heater warms the O2S to operating temperature, the HO2S will output a voltage in relation to the amount of oxygen in the exhaust. With ignition on and engine off, the exhaust usually contains a high oxygen content. With the engine OFF the HO2S voltage will usually decrease from the initial or bias voltage due to the high oxygen content.
  2. 4 -  This step checks for proper HO2S heater ignition 1 voltage and ground supply.
  3. 5 -  This step checks for proper PCM and signal circuit operation.
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