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6E2–158 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS DTC P0172 – Fuel Trim System Rich Bank 1 (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 Ignition “ON,” engine “OFF,” monitor the TP display on Does the TP Angle display increase steadily and Minimum 0% Maximum 100% Go to Step 13 Go to Step 20 13 1. Disconnect the MAF sensor electrical connector. monitoring the “B1 Long Term Fuel Trim” and “B1 Did both values change to near the specified value? 0% Go to Step 21 Go to Step 14 14 1. Ignition “ON,” engine “OFF.” terminals of canister purge solenoid. Is the test light on? — Go to Step 15 Go to Step 18 15 Check for short to ground in the wire (red/blue) Was there a short to ground? — Go to Step 16 Go to Step 17 16 Repair the short to ground. Is the action complete? — Verify repair — 17 Replace the PCM. Is the action complete? — Verify repair — 18 1. Perform the “Injector Balance Test.” necessary (refer to Fuel Metering System). Did the Injector Balance Test isolate a problem — Verify repair Go to Step 19 19 1. Remove and visually/physically inspect the Bank 1 HO2S 1 for silicon contamination. This will be 2. If contamination is evident on the Bank 1 HO2S 1, replace the contaminated sensors. Did the sensor require replacement? — Verify repair Refer to Diagnostic Aids 20 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 — 21 Replace the MAF sensor. Is the action complete? — Verify repair — |