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6E–169 ENGINE DRIVEABILITY AND EMISSIONS DTC P0175 – Fuel Trim System Rich Bank 2 (Cont'd) Step No Yes Value(s) Action 11 1. Disconnect the vacuum hose from the fuel pressure regulator and inspect the hose for the presence of 2. If fuel is present in the vacuum hose, replace the fuel pressure regulator (refer to Fuel Metering System). Did the fuel pressure regulator require replacement? — Verify repair Go to Step 12 12 1. Ignition “ON,” engine “OFF.” slowly depressing the accelerator pedal. Does the TP Angle display increase steadily and Minimum 0% Maximum 100% Go to Step 13 Go to Step 18 13 1. Disconnect the MAF sensor electrical connector. monitoring the “BANK 1 L.T. FUEL TRIM” and Did both values change to near the specified value? 0% Go to Step 19 Go to Step 14 14 1. Perform the “Fuel System Pressure Test.” repair as necessary (refer to Engine Fuel or Fuel Metering System). Did the Fuel System Pressure Test isolate a condition — Verify repair Go to Step 16 15 Replace the PCM. IMPORTANT: The replacement PCM must be UBS 98model year Immobilizer Workshop Manual. Is the action complete? — Verify repair — 16 1. Perform the “Injector Balance Test.” repair as necessary (refer to Fuel Metering System). Did the Injector Balance Test isolate a problem — Verify repair Go to Step 17 17 1. Remove and visually/physically inspect the Bank 2 HO2S 1 for silicon contamination. This will be 2. If contamination is evident on the Bank 2 HO2S 1, replace the contaminated sensor. Did the sensor require replacement? — Verify repair Refer to Diagnostic Aids 18 1. Check the TP sensor mounting screws and tighten or replace them as necessary if they are loose or 2. If the screws are OK, replace the TP sensor. Is the action complete? — Verify repair — 19 Replace the MAF sensor. Is the action complete? — Verify repair — |