Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI2002SONATA L4-2.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONOSCILLOSCOPE PATTERNS AND WAVEFORMS
2002 Hyundai Sonata L4-2.4L
Oscilloscope Patterns and Waveforms
2002 Hyundai Sonata L4-2.4LSECTION Oscilloscope Patterns and Waveforms
MAJOR SENSOR REFERENCE WAVE-FORMS
The following are the major sensor reference wave-forms. Below is the data for CMP, Mass Air Flow Sensor, Throttle Position Sensor, Rear 02 Sensor, Front 02 Sensor and Injection Pulse when revving quickly up to 480O 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 "THRTL POS SEN" is closed (accelerator pedal is released).
TPS should increase while depressing the accelerator pedal and should decrease while releasing it.
* FR 02 SENSOR AND RR 02 SENSOR
FR 02 and RR 02 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.
The following are the major sensor reference wave-forms. Below is the data for CMP, Mass Air Flow Sensor, Throttle Position Sensor, Rear 02 Sensor, Front 02 Sensor and Injection Pulse when revving quickly up to 480O 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 "THRTL POS SEN" is closed (accelerator pedal is released).
TPS should increase while depressing the accelerator pedal and should decrease while releasing it.
* FR 02 SENSOR AND RR 02 SENSOR
FR 02 and RR 02 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.