Hyundai Tucson Quiz
Engine Electrical System

Troubleshooting

In this manual: Engine Electrical System
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
~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). Input circuit wiring of the lock switch is damaged or open Repair the wiring harness or repair and replace the mute 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. Input circuit of the "SET/–" switch 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) Disconnected or damaged cruise control main switch indicator lamp Repair the harness or replace the component.
Harness is damaged or disconnected

Test yourself

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