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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0136: Ho2S 2 Circuit >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. The information is then stored in scan tool for later reference.
  2. 2  - This step checks whether malfunction is a high input condition.
  3. 3  - In this step, DMM is used as a low current voltage source taking the place of the HO2S.
  4. 4  - This step checks whether malfunction is a low input condition.
  5. 5  - This step determines if DTC P0136 is the result of a hard failure or an intermittent condition.
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