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4 2. Start the engine. Did the DTC fail this ignition? - Go to Step 6 Go to Intermittent Conditions 5 1. Observe the Freeze Frame/Failure Records for this DTC. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Operate the vehicle within the Conditions for Running the Heater Current Test. You may Did the DTC fail this ignition? - Go to Step 6 Go to Intermittent Conditions 6 Inspect the O2A fuse. - Go to Step 7 Go to Step 8 7 Test the ignition 1 voltage circuit for a short to - Go to Step 22 Go to Step 10 8 1. Disconnect the affected HO2S. 2. Turn ON the ignition, with the engine OFF. 3. Probe the ignition 1 voltage circuit of the HO2S harness connector on the engine harness Does the test lamp illuminate? - Go to Step 9 Go to Step 19 9 1. Connect a test lamp between the ignition 1 voltage circuit of the HO2S harness connector 2. Command the HO2S heaters ON with a scan tool. IMPORTANT: The test lamp may blink prior to commanding the -
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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