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6: This steps inspects for conditions than can cause the TWC efficiency to appear degraded. DTC P0420 or P0430 Step Action Values Yes No 1 Did you perform the Diagnostic System Check- - Go to Step 2 Go to Diagnostic System Check - Engine Controls 2 Review the DTC information on the scan tool. - Go to Diagnostic Trouble Code (DTC) List Go to Step 3 3 1. Start and idle the engine. 2. Allow the engine to reach operating temperature. 3. Increase the engine speed to 1,500 RPM for 1 minute. 4. Ensure Closed Loop operation is enabled. 5. Return the engine to a stabilized idle. 6. Observe the HO2S 2 voltage parameter on the scan tool for the applicable bank. Is the applicable HO2S 2 voltage parameter 350 Go to Step 5 Go to Step 4 4 1. Clear the DTCs with a scan tool. 2. Start the engine. 3. Operate the vehicle within the Conditions For Running the DTC. You may also operate the Did DTC P0420 or P0430 set? - Go to Step 5 Go to Diagnostic Aids 5 Visually and physically inspect the TWC for the z Physical damage z Severe discoloration caused by excessive IMPORTANT: Verify that the three-way catalytic converter -
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and 6.0L - Hummer H2
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