Turbocharger: Testing and Inspection
TURBOCHARGER SUPERCHARGING PRESSURE CHECKCAUTION: Do a test drive with two passengers in the vehicle and where full throttle acceleration can be safely made.
A driver should not read the pressure gauge, but a front passenger should.
1. Disconnect the hose (black) from the turbocharger waste gate solenoid, and connect the pressure gauge to the hose. Plug the nipple of the solenoid valve from which the hose (black) has been disconnected.
2. Drive the vehicle with full throttle and accelerate the engine to a speed of more than 3,500 r/min at 2nd gear. Measure the supercharging pressure when the pointer is stabilized.
Standard value: 44 - 101 kPa (6.4 - 14.7 psi)
3. If the supercharging pressure deviates from the standard value, check the following items for possible causes. When pressure is high:
- Malfunction of turbocharger waste gate actuator
- Malfunction of turbocharger waste gate valve
- Disconnected or cracked turbocharger waste gate actuator hose When pressure is low:
- Malfunction of turbocharger waste gate actuator
- Supercharging pressure leaks
- Faulty turbocharger
INTAKE CHARGE PRESSURE CONTROL SYSTEM CHECK
1. After the diagnostic trouble code of MFI system is completely read, turn off the ignition switch.
2. Disconnect the hose (black) from the turbocharger waste gate solenoid and plug this hose.
3. Connect a hand vacuum pump to the turbocharger waste gate solenoid nipple to which the hose (black) was connected.
4. Use the vacuum pump to apply negative pressure, and check the negative pressure condition while the engine is stopped and while it is idling.
NOTE: If this check indicates an abnormal condition, the turbocharger waste gate solenoid is broken.