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6E–222 6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS DTC P0174 – Fuel Trim System Lean Bank 2
Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to OBD System Check 2 Are any DTCs set other than P0174 and P0171? — Go to the applicable DTC charts and repair the other DTCs before proceeding with this chart. Go to Step 3 3 1. Start the engine and operate the vehicle in “closed loop”. 2. Observe the “BANK 2 L.T. FUEL TRIM” display on the Tech 2. Is the displayed values greater than the specified L.T. Fuel Trim: +20% Go to Step 5 Go to Step 4 4 1. Review and record Tech 2 Failure Records data. vehicle to duplicate the Failure Records conditions. 3. Monitor the Tech 2 “DTC” info for DTC P0174 while operating the vehicle to duplicate the Failure 4. Continue operating the vehicle until the DTC P0174 test runs. 5. Note the test result. Does the Tech 2 indicate DTC P0174 failed this — Go to Step 5 The lean condition is not present. If a driveability symptom still exists, refer to Symptoms section. 5 Was DTC P0171 also set? — Go to Step 6 Go to Step 15 6 Visually and physically inspect the vacuum hoses for Did your inspection reveal a problem requiring repair? — Verify repair Go to Step 7 7 Visually and physically inspect the crankcase Crankcase Ventilation System). Did your inspection reveal a problem requiring repair? — Verify repair Go to Step 8 8 1. Inspect the MAF sensor inlet screen for damage or for the presence of foreign objects which may 2. Correct any problem that is found as necessary. Did your inspection of the MAF sensor reveal a — Verify repair Go to Step 9 9 Start the engine and note the idle quality. Is a high or unsteady idle being experienced? — Go to Step 10 Go to Step 11 |