Hyundai Tucson LM Quiz
Engine Electrical System

Troubleshooting

In this manual: Engine Electrical System
General Information — 1Engine Mechanical System — 44Engine Electrical System — 45Emission Control System — 24Engine Control System/Fuel System — 93Clutch System — 13Manual Transmission — 18Automatic Transmission — 87Four-Wheel Drive (4WD) System — 26Drive Shaft and Axle — 29Suspension System — 35Steering — 20Restraints — 47Brake System — 36Body (Interior and Exterior) — 53Body Electrical System — 202Heating, Ventilation, and Air Conditioning — 58
~2min read

Symptom Troubleshooting Tables

Symptom Troubleshooting 1

Symptom Troubleshooting 2
Symptom of Malfunction Probable Cause Remedy
Vehicle set speed fluctuates greatly up or down
"Hunting" (repeated alternating acceleration and deceleration) occurs after setting		 Vehicle speed sensor circuit malfunction Repair the vehicle speed sensor system or replace the component.
Engine control module malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 3
Symptom of Malfunction Probable Cause Remedy
CC system does not cancel when the brake pedal is depressed Brake switch wiring is damaged or disconnected Repair the harness or replace the brake pedal switch.
ECM signal malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 4
Symptom of Malfunction Probable Cause Remedy
CC system does not cancel when the shift lever is moved to "N" (however, it cancels when the brake pedal is depressed) Inhibitor switch input circuit wiring is damaged or disconnected. Repair the harness or repair or replace the inhibitor switch.
Incorrect inhibitor switch adjustment
ECM signal malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 5
Symptom of Malfunction Probable Cause Remedy
Cannot decelerate (coast) using the "SET/–" switch. Temporary damage or disconnection of the SET/– switch input circuit wiring Repair the harness or replace the "SET/–" switch.
ECM signal malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 6
Symptom of Malfunction Probable Cause Remedy
Cannot accelerate or resume speed using the "RES/+" switch. Damaged or disconnected wiring, or a short circuit, or the input circuit of the "RES/+" switch Repair the harness or replace the "RES/+" switch.
ECM signal malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 7
Symptom of Malfunction Probable Cause Remedy
The CC system can be set while driving at a vehicle speed of more than 40 km/h, or there is no automatic cancellation at this speed Vehicle speed sensor circuit malfunction Repair the vehicle speed sensor system or replace the component.
ECM signal malfunction Check the input and output signals at the ECM.

Symptom Troubleshooting 8
Symptom of Malfunction Probable Cause Remedy
Cruise control main switch indicator lamp does not illuminate (but the CC system operates normally) Damaged or disconnected cruise control main switch indicator lamp bulb Repair the harness or replace the component.
Harness is damaged or disconnected

Test yourself

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