Oscilloscope Patterns and Waveforms

MAJOR SENSOR REFERENCE WAVE-FORMS
The followings are the major sensor reference wave-forms. Below is the data for CMP, Mass Air Flow Sensor, Throttle Position Sensor, Rear O2 Sensor, Front O2 Sensor and Injection Pulse when revving quickly up to 4800 rpm under no-load after warming up engine sufficiently. Each value is for reference, the exact values may vary.

CMP AND CKP




Should increase gradually while depressing the accelerator pedal and should decrease gradually after releasing the pedal without any intermittent drop or rise.

MAF SENSOR AND TPS




MAF should increase when depressing the accelerator pedal and should decrease at the moment & ldquo;THRTL POS SEN & rdquo; is closed (accelerator pedal is released it).

TPS should increase while depressing the accelerator pedal and should decrease while releasing it.

FR O2 SENSOR AND RR O2 SENSOR




FR O2 and RR O2 sensor may increase immediately after depressing the accelerator pedal and may decrease after releasing the pedal.

INJ PULSE




Should increase when depressing the accelerator pedal and should decrease when the pedal is released.