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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1470 (Engine Control System - Diagnosis - 4.8L, 5.3L, & 6.0L (DTC P0068 To DTC P0174)) >> Diagnostic Information & Procedures >> DTC P0136 or P0156 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
  1. The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 did not transition below 350 mV and above 709 mV during the passive test.
  2. One of the following tests fail:
    • Lean Intrusive Test
      • The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 is more than 350 mV for 25.4 seconds.
      • The HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1 is less than 300 mV.

        OR

    • Rich Intrusive Test
      • The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 is less than 709 mV for 25.4 seconds.
      • The HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1 is more than 600 mV.
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