Turbocharger: Testing and Inspection

TURBOCHARGER INTAKE CHARGE PRESSURE INSPECTION

Caution: Perform running inspection with two passengers in the vehicle and where full throttle acceleration can be safely made. The pressure gauge reading is taken by a front seat passenger.





1. Disconnect the intake charge pressure control hose at the solenoid valve (fixed to the air cleaner), and plug the nipple. Attach the pressure gauge to the hose.
2. Drive the vehicle with full throttle and accelerate the engine to a speed of more than 3,500 rpm at 2nd gear. Measure the intake charge pressure when the pointer is stabilized.

Standard value:
Manual Transaxle: 41 - 75 kPa (6.0 - 10.8 psi)
Automatic transaxle: 37 - 68 kPa (5.4 - 9.9 psi)

Caution: If the intake charge pressure deviates from the standard value, check the following items for possible causes.
- When pressure is high:
Turbocharger waste gate actuator malfunction
- When pressure is low:
Turbocharger waste gate actuator malfunction
Intake charge pressure leaks, faulty turbocharger

INTAKE CHARGE PRESSURE CONTROL SYSTEM INSPECTION
1. After the on-hoard diagnostic content of Multiport Fuel Injection system is completely read, turn off the ignition switch.





2. Disconnect the vacuum hose (white-striped) from the turbocharger waste gate actuator, and connect the hand vacuum pump to the vacuum hose.
3. Disconnect the vacuum hose (black) from the intake port (A in the figure) of the boost which controls the turbocharger waste gate actuator, and insert the blind plug into the nipple from which the vacuum hose was disconnected.
4. Keep the (-) terminal of the battery disconnected for 10 seconds or longer, and then reconnect the terminal.





5. Apply the negative pressure in the following state, and check the air tightness.

NOTE: If negative pressure is not normal, it can be assumed that there is a malfunction in the turbochargerwaste gate solenoid or vacuum hose.

6. With the vacuum hose (black) closed when idling, apply negative pressure and inspect the condition of the negative pressure.








NOTE: If negative pressure is not normal, it can be assumed that there is a malfunction in the knock sensor circuit.

7. Turn off the ignition switch, and connect the connector of the knock sensor.
8. Use scan tool to erase the diagnostic trouble code or disconnect the (-) terminal of the battery for 10 seconds or more.

NOTE: This erases the diagnostic memory of the knock sensor trouble by disconnecting the knock sensor connector.