Hyundai Elantra: Cruise Control System / Troubleshooting

Hyundai Elantra AD (2016-2020) Service Manual / Engine Electrical System / Cruise Control System / Troubleshooting

Trouble Symptom Charts

Trouble Symptom 1

Trouble Symptom 2

Trouble symptom	Probable cause	Remedy
The set vehicle speed varies greatly upward or downward "Surging" (repeated alternating acceleration and deceleration) occurs after setting	Malfunction of the vehicle speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of ECM	Check input and output signals at ECM

Trouble Symptom 3

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the brake pedal is depressed	Damaged or disconnected wiring of the brake pedal switch	Repair the harness or replace the brake pedal switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 4

Trouble symptom	Probable cause	Remedy
The CC system is not canceled when the shift lever is moved to the "N" position (It is canceled, however, when the brake pedal is depressed)	Damaged or disconnected wiring of inhibitor switch input circuit	Repair the harness or repair or replace the inhibitor switch
	Improper adjustment of inhibitor switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 5

Trouble symptom	Probable cause	Remedy
Cannot decelerate (coast) by using the "SET/–" switch	Temporary damaged or disconnected wiring of "SET/–" switch input circuit	Repair the harness or replace the "SET/–" switch
Cannot decelerate (coast) by using the "SET/–" switch	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 6

Trouble symptom	Probable cause	Remedy
Cannot accelerate or resume speed by using the "RES/+" switch	Damaged or disconnected wiring, or short circuit, or "RES/+" switch input circuit	Repair the harness or replace the "RES/+" switch
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 7

Trouble symptom	Probable cause	Remedy
CC system can be set while driving at a vehicle speed of less than 40km/h (25mph), or there is no automatic cancellation at that speed	Malfunction of the vehicle-speed sensor circuit	Repair the vehicle speed sensor system, or replace the part
	Malfunction of the ECM signals	Check input and output signals at ECM

Trouble Symptom 8

Trouble symptom	Probable cause	Remedy
The cruise main switch indicator lamp does not illuminate (although CC system is normal)	Damaged or disconnected bulb of cruise main switch indicator lamp	Repair the harness or replace the part.
	Harness damaged or disconnected	Repair the harness or replace the part.

Schematic Diagrams

System Block Diagram Component Parts And Function Outline Component partFunctionVehicle-speed sensor, ESP/ABS Control ModuleConverts vehicle speed to pulse.ECMReceives signals from sensor and cont ...

Cruise Control Switch Components and Components Location

Components 1. Remote control switch (LH)2. Remote control switch (RH) ...

Other information:

Hyundai Elantra AD (2016-2020) Service Manual: Air Cleaner Repair procedures
Removal and Installation Air Cleaner Assembly 1. Remove the engine cover. (Refer to Engine And Transaxle Assembly - “Engine Cover”) 2. Disconnect the battery negative terminal. 3. Remove the air duct (A). 4. Disconnect the breather hose (A). 5. Disconnect the intake hose ...

Hyundai Elantra AD (2016-2020) Service Manual: Radiator Repair procedures
Inspection Radiator Cap Testing 1. Remove the radiator cap, wet its seal with engine coolant, and then install it on a pressure tester. 2. Apply a pressure of 93.16 ~ 122.58 kPa (0.95 ~ 1.25 kgf/cm?, 13.51 ~ 17.78 psi). 3. Check for a drop in pressure. 4. If the pressure drops, re ...