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13 resistance. Refer to Circuit Testing and Wiring - Go to Step 20 Go to Step 17 14 Test the HO2S high signal circuit for an open or high - Go to Step 20 Go to Step 17 15 1. The HO2S may be detecting a lean exhaust condition or may be contaminated. Inspect for the z A silicon contaminated HO2S z Any water intrusion into the HO2S z An exhaust leak between the HO2S and the z Any vacuum leaks z An incorrect fuel pressure-Refer to Fuel z Any lean fuel injectors-Refer to Fuel z An inaccurate mass air flow (MAF) sensor- 2. Repair any of the above or similar engine conditions as necessary. Did you find and correct the condition? NOTE: Refer to Silicon Contamination of Heated - Go to Step 20 Go to Step 16 16 Test for shorted terminals and for poor connections at - Go to Step 20 Go to Step 18 17 Test for shorted terminals and for poor connections at - Go to Step 20 Go to Step 19 Replace the affected HO2S. Refer to Heated Oxygen
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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