Code No. P0299: Turbocharger Under Boost Condition

FUNCTION

The engine-ECU checks whether the boost pressure is not lower than the specified value.

TROUBLE JUDGMENT

Check Condition

Engine is running

Judgment Criterion

The opening degree of accelerator pedal is 23% for 3 seconds and the boost pressure is not lower than the specified value.

PROBABLE CAUSES

Intercooler air hose disconnected or damaged
Vacuum hose of manifold absolute pressure sensor disconnected or damaged
Failed manifold absolute pressure sensor
Failed engine-ECU

DIAGNOSIS

STEP 1. Check on intercooler air hose.

Check whether the intercooler air hose is disconnected or damaged.

Q. Is the check result normal?

	Go to Step 2 .

	Repair.

STEP 2. Check on vacuum hose of manifold absolute pressure sensor.

Check whether the vacuum hose of manifold absolute pressure sensor is disconnected or damaged.

Q. Is the check result normal?

	Go to Step 3 .

	Repair.

STEP 3. Check turbocharger supercharging pressure..

Check turbocharger supercharging pressure (Refer to GROUP 15 - On-vehicle - Turbocharger Supercharging Pressure Check ).

Q. Is the check result normal?

	Go to Step 4 .

	Repair.

STEP 4. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is the check result normal?

Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing

). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns

). After registering the injector identification code, the vehicle equipped with the DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Emission Control - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).