Hyundai i20 Quiz
Engine Electrical System

Troubleshooting

In this manual: Engine Electrical System
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
~2min read

MALFUNCTION SYMPTOM TABLES

MALFUNCTION SYMPTOM 1

Symptom 2
Symptom Probable Cause REMEDY
Set engine speed varies greatly in both directions
"Sawtooth effect" (alternating and repeated engine acceleration and deceleration) occurs after setting.		 Vehicle speed sensor circuit malfunction Repair the vehicle speed sensor circuit or replace the component
ECM malfunction Check the ECM input and output signals.

SYMPTOM 3
Symptom Probable Cause REMEDY
CC system does not deactivate when the brake pedal is depressed. Brake switch wiring is damaged or disconnected Repair the harness or replace the brake pedal switch.
ECM malfunction Check the ECM input and output signals.

SYMPTOM 4
Symptom Probable Cause REMEDY
CC system does not cancel while the shift lever is in the N position (but cancels when the brake pedal is depressed). Inhibitor switch input circuit wiring is damaged or disconnected Repair the harness or repair and replace the inhibitor switch.
Incorrect inhibitor switch adjustment
ECM malfunction Check the ECM input and output signals.

SYMPTOM 5
Symptom Probable Cause REMEDY
Cannot decelerate (coast) using the "SET/–" switch. "SET/–" switch input circuit is temporarily damaged or disconnected Repair the harness or replace the "SET/–" switch.
ECM malfunction Check the ECM input and output signals.

SYMPTOM 6
Symptom Probable Cause REMEDY
Unable to accelerate or resume speed using the "RES/+" switch Disconnected or damaged wiring, or short circuit or open in the "RES/+" switch input circuit Repair the harness or replace the "RES/+" switch.
ECM malfunction Check the ECM input and output signals.

SYMPTOM 7
Symptom Probable Cause REMEDY
The cruise control system can be set while driving only if vehicle speed is above 40 km/h. There is no automatic standby at this speed. Vehicle speed sensor circuit malfunction Repair the vehicle speed sensor circuit or replace the component
ECM malfunction Check the ECM input and output signals.

SYMPTOM 8
Symptom Probable Cause REMEDY
Cruise control main switch indicator lamp does not illuminate (but cruise control operates normally) Cruise control main switch indicator lamp is disconnected or damaged Repair the harness or replace the component.
Harness is damaged or disconnected

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A quick Hyundai i20 quiz: every answer comes with an explanation and a link to the manual page.