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Engine Management – V6 – Diagnostics Page 6C1-2–94
9 1 The HO2S is detecting a rich or lean exhaust • HO2S connector water intrusion. • A silicon-contaminated HO2S. • Fuel-contaminated engine oil – refer to 6.5 Alcohol / Contaminants in Fuel Diagnosis. • Rich fuel injectors. • Lean fuel injectors. Refer to 6C Fuel • An exhaust leak between the HO2S and • Vacuum leaks. • Fuel contamination. Water, even in small Alcohol / Contaminants in Fuel Diagnosis in this Section. • An inaccurate mass air flow (MAF) sensor. 2 Repair any of the above or similar engine Did you find and correct the condition? — Go to Step 15 Go to Step 10 10 1 Test for intermittent and poor connections at the Did you find and correct the condition? — Go to Step 15 Go to Step 13 11 1 Test for intermittent and poor connections at the Did you find and correct the condition? — Go to Step 15 Go to Step 14 12 1 Repair the circuit with high resistance. Refer to Did you complete the repair? — Go to Step 15 — 13 1 Replace the affected HO2S. Refer to 6C1-3 Did you complete the replacement? — Go to Step 15 — 14 1 Replace the ECM. Refer to 6C1-3 Engine Did you complete the replacement? — Go to Step 15 — 15 1 Use Tech 2 to clear the DTCs. 2 Turn OFF the ignition for 30 seconds. 3 Start the engine. 4 Operate the vehicle within the Conditions for Did the DTC fail this ignition? — Go to Step 2 Go to Step 16 |