|
|
6E–218 6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS DTC P0172 – Fuel Trim System Rich Bank 1 (Cont'd) Step No Yes Value(s) Action 8 Inspect the MAF sensor inlet screen for damage or for 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 low or unsteady idle being experienced? — Go to Step 10 Go to Step 11 10 1. Ignition “OFF”. plate for coking and foreign objects. 3. If a problem was found, repair as necessary. Did your inspection reveal a condition requiring repair? — Verify repair Go to Step 11 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 TP1 Angle Does the TP Angle display increase steadily and Minimum 8% Maximum 92% Go to Step 13 Go to Step 21 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 22 Go to Step 14 14 1. Perform “Fuel System Pressure Test”. repair as necessary (refer to Engine Fuel or Fuel Metering System). Did the Fuel System Pressure Test isolate a problem — Verify repair Go to Step 15 15 1. Ignition “ON”, engine “OFF”. terminals of canister purge solenoid. Is the test light on? — Go to Step 16 Go to Step 19 16 Check for short to ground in the wire (YEL/RED) Was there a short to ground? — Go to Step 17 Go to Step 18 17 Repair the short to ground. Is the action complete? — Verify repair — |