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TROUBLESHOOTING DIESEL FUEL 13A-308 Judgment Criterion • Actual boost pressure is lower than target boost pressure by less than 6.7 kPa PROBABLE CAUSES • Failed variable geometry turbocharger control system • Failed engine-ECU DIAGNOSTIC PROCEDURE STEP 1. Check the turbocharger supercharging • Check the turbocharger supercharging pressure (refer to GROUP 15 − On-vehicle Service − Tur- bocharger Supercharging Pressure Check ). Q: Is the check result normal? YES : Go to Step 2 . NO : Repair the variable geometry turbocharger STEP 2. M.U.T.-III diagnosis code. • After clearing the diagnosis code through M.U.T.- III, start the engine and confirm whether the diag- Q: Is the diagnosis code set? YES : Replace the engine-ECU. When the engine- ECU is replaced, write the chassis number − Precautions Before Service − How to Perform Chassis Number Writing ). After replacing the engine-ECU, − Precautions Before Service − What The Common Rail Engine Learns ). After − Emission Control − Diesel Particulate Filter (DPF) System − Forcible DPF Regeneration ). NO : Intermittent malfunction (Refer to GROUP − How to Use Troubleshooting/ Inspection Service Points − How to Cope with Intermittent Malfunctions ). |