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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0130: Ho2S Circuit (Sensor 1) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

When vehicle is first started, engine operates in open loop operation, ignoring the oxygen sensor (O2S) signal and calculating the air/fuel ratio based on inputs from ECT sensor, TP sensor and MAP sensor only. PCM will begin by using O2S signal for controlling fuel delivery, closed loop, when engine has run a minimum amount of time based on ECT at engine start up, O2S 1 has a varying voltage output showing that O2S 1 is hot enough to operate properly, and ECT has increased a minimum amount based on ECT at engine start up.

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