Connect the scan tool probe to the boost pressure sensor terminal 4.

Check the signal wavefoam after depressing the accelerator pedal fully.

IS THERE THE SIGNAL WAVEFORM PROPERLY DISPLAYED ?

YES

NO

a.

Recheck the wiring/harness

b.

Recheck the boost pressure sensor

c.

Go to step 4

WAVEFORM ANALYSIS

This test should be inspected after drepressing the HOLD mode from run during the idling, acceleration and deceleration.

As accel pedal is pressed down fully, the intensity of the waveform increases individually.

If the waveform pattern becomes distorted during the acceleration or deceleration, replace the APS

MONITORING FOR PENDING DTC SET ?

YES

NO