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The HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1 is more than 600 mV. Action Taken When the DTC Sets z The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition z The control module records the operating conditions at the time the diagnostic fails. The first time the Conditions for Clearing the MIL/DTC z The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles z A current DTC, Last Test Failed, clears when the diagnostic runs and passes. z A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other z Clear the MIL and the DTC with a scan tool. Test Description The numbers below refer to the step numbers on the diagnostic table. 2: If the voltage does not change more than the specified value, the condition is present. DTC P0136 or P0156 Step Action Value (s) Yes No Schematic Reference:Engine Controls Schematics 1 Did you perform the Diagnostic System Check-Engine - Go to Step 2 Go to Diagnostic System Check - Engine Controls 2 1. Start the engine. 2. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . 3. Operate the engine at 1,500 RPM for 30 seconds. 4. While observing the affected HO2S voltage parameter with a scan tool, quickly cycle the 200
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L - Hummer H2
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