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6E–157 ENGINE DRIVEABILITY AND EMISSIONS DTC P0171 – Fuel Trim System Lean Bank 1 (Cont'd) Step No Yes Value(s) Action 11 Check the fuel for excessive water, alcohol, or other Diagnosis in Engine Fuel for the procedure) and correct the contaminated fuel condition Engine Fuel). Was the fuel contaminated? — Verify repair Go to Step 12 12 1. Visually and physically inspect the PCM injector grounds, power grounds and sensor grounds to 2. If a faulty ground condition is present, correct it as necessary. Did your inspection reveal a condition requiring repair? — Verify repair Go to Step 13 13 1. Disconnect the MAF sensor electrical connector. monitoring the “BANK 1 S.T. FUEL TRIM” displayed Does “BANK 1 S.T. FUEL TRIM” value decrease to 0% Go to Step 19 Go to Step 14 14 Perform the procedure in the “Fuel System Pressure Did Fuel System Pressure Test isolate a condition — Verify repair Go to Step 15 15 1. Visually and physically inspect the intake manifold, injector O-rings, EGR adapter, EGR valve and the 2. Repair any problem that is found. Did your inspection reveal a problem? — Verify repair Go to Step 16 16 Visually and physically inspect the Bank 1 exhaust Did your inspection reveal a problem? — Verify repair Go to Step 17 17 Perform the “Injector Balance Test,” and correct any Fuel Metering System). Did Injector Balance Test isolate a problem? — Verify repair Go to Step 18 18 1. Visually and physically inspect the Bank 1 HO2S 1 to ensure that it is installed securely and that the 2. If a problem is found, correct it as necessary. Did your inspection reveal a problem? — Verify repair Refer to Diagnostic Aids 19 Replace the MAF sensor. Is the action complete? — Verify repair — |