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.

FAIL-SAFE AND BACKUP FUNCTION



  • The fuel injection amount is restricted. (Output restriction)
  • The DPF regeneration is prohibited.
  • The EGR control is stopped (fully closed).
  • The open angle of the accelerator pedal is restricted.
  • The throttle valve is opened. (Electrical discontinuity)
  • The turbocharger control is prohibited.
  • The AS&G control is prohibited.

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