Checking the air intake system
Make sure that the passage between the air filter housing and the turbocharger inlet and between the turbocharger outlet and the cylinder head is leak-proof and free from obstruction.
Exhaust system check
Check the passage between the cylinder head and the turbocharger inlet and between the turbocharger outlet and the exhaust pipe for leaks and no obstruction.
Boost pressure check
Warm up the engine.
Pic. 2.428. Connecting the boost pressure gauge
Use a tee to connect SST (boost pressure gauge) to the hose leading to the air inlet (pic. 2.428).
While pressing the clutch pedal, also press the accelerator pedal to the stop. Measure boost pressure at maximum engine speed (from 5100 to 5250 min–1).
Rated value: 15-45 kPa.
If the pressure is lower than the nominal, check the tightness of the intake and exhaust systems.
If there is no leakage, check if the drive hose is disconnected. If not disconnected, check turbocharger.
If pressure is higher than rated, check for disconnected or damaged actuator hose. Otherwise, check the turbocharger.
Checking the boost pressure sensor
Check the power supply voltage.
Disconnect the boost pressure sensor connector.
Turn the ignition ON (IG).
Pic. 2.429. Conclusions of contacts of a socket of the gauge of pressure of boost
Use a voltmeter to measure the voltage between terminals 3 (VC) and 1 (E2) from the wiring harness side (pic. 2.429).
Rated voltage: 4.5 to 5.5 V
If the result is not as specified, check the wiring harness and engine ECU.
Turn off the ignition (OFF).
Connect the boost pressure sensor connector.
Check supply voltage.
Turn the ignition ON (IG).
Disconnect the vacuum hose from the boost pressure sensor.
Pic. 2.430. Output voltage measurement at atmospheric pressure
Connect a voltmeter to terminals E6-28 (PIM) and E7–28 (E2) engine ECU, then measure the output voltage at atmospheric pressure (pic. 2.430).
Create a vacuum in the boost pressure sensor from 13.3 kPa to 66.7 kPa.
Measure the voltage drop.
Voltage drop
Using SST (boost pressure gauge), pressurize the boost pressure sensor between 19.6 kPa and 98.0 kPa.
Measure the voltage rise.
Voltage boost
If the result is not as specified, check the wiring harness and engine ECU.