Hyundai Elantra CN7: Tire Pressure Monitoring System - Suspension System - Hyundai Elantra CN7 2021-2025 Workshop ManualHyundai Elantra CN7: Tire Pressure Monitoring System

Description and operation

Description
The Tire Pressure Monitoring System (TPMS) monitors the pressure and temperature inside the tire in order to warn the driver of changes in pressure which may influence the operation of the vehicle. The TPMS control module analyzes wireless information fro
In other words, the system detects the pneumatic pressure of the tires and warns the driver of if the pneumatic pressure drops below the standard level.
Tire low-pressure warning light

Lamp ON/OFF Conditions when the Tire Pressure Decreases or Air is Leaking from the Tire
1.
Lamp ON
•
The lamp turns ON when the tire pressure decreases below the standard level.
2.
Lamp OFF
•
Low pneumatic pressure: The warning lamp turns OFF when the tire pressure exceeds the pressure required to turn off the lamp.
TPMS Fault Warning Lamp
1.
Warning Conditions and Display
•
When the system detects a defect in the operating environment the warning lamp blinks for about 1 minute and then turns ON.
2.
Lamp OFF
•
The warning lamp turns OFF when the DTC is resolved. DTC is stored as a past breakdown.
   
•
If this phenomenon occurs while driving, you should check the cause of the fault even after the DTC is resolved.
(Turn the ignition switch from OFF to ON. Then, check the lamp status.)
•
The warning lamp turns off once the DTC is resolved. The warning lamp stays on until you complete the check necessary to resolve the DTC.
•
If the DTC is resolved, the warning lamp turns OFF during the same ignition cycle.
   
If the vehicle starts within 19 minutes after the replacement of the wheel of the stopped vehicle, the TPMS Malfunction Indicator on the instrument cluster illuminates.
–
The above symptom is due to communication failure between the BCM and the replaced TPMS ID.
–
This communication failure indicator turns off in 19 minutes after the vehicle stops through the BCM’s automatic learning process of TPMS ID.
(When driving the vehicle after stopping for over 19 minutes, the indicator turns off automatically.)
System Defect
1.
General Operation
•
The system detects many input elements to identify potential defects.
•
DTC is determined by the cause of the problem.
•
Certain defects are not diagnosed as DTC.
The following are major defects:
•
In order to diagnose more symptoms of the fault when the ignition line malfunctions, you must check the warning lamp when you turn the ignition on.
•
Check whether the warning lamp turns on and then off.

Components and components location

Components

1. Integrated Body Control Unit (IBU)
2. TPMS sensor (FL)
3. TPMS sensor (RL)
4. TPMS sensor (RR)
5. TPMS sensor (FR)

Troubleshooting

TPMS Inspection method

TPMS Sensor

Description and operation
Description

1.
Function
•
By detecting the pressure, temperature, acceleration, and battery condition, transmit information to ECU by a wireless RF.
•
Wheel location is recognized by comparing the Wheel Pulse of ECS (ABS) and RF send signal.
2.
Structure and features
•
There are four (4) sensors mounted in each wheel of the vehicle.
•
Frequency conversion type is FSK, and High Line is used in common.
3.
Mode
•
It consists of Shipping mode, stop mode, driving mode, and automatic learning mode.
Type
Function
Valve type
Snap in type [Rubber valve]
Screw
Screw T10 [Continental certification part]
MCU
ATIC 149 [Infineon]
Battery type
CR2032 type

Automatic Location Learning Perform
•
After stopping or parking for more than 19 minutes, automatic learning function in every driving position is performed.
•
The sensor is converted to Parking Mode when stopped or parked for more than 15 minutes. When acceleration of over 4g (15-20km/h) is detected in Parking Mode, it is converted to First Block Mode.
Repair procedures
Removal
1.
Remove the wheel and tire.
(Refer to Suspension System - "Wheel")
2.
Remove the screw with torx driver (A).
   
•
When installing the bead brake, make sure that it does not come in contact with the TPMS sensor.
•
Be careful not to damage the TPMS sensor when installing the bead brake near the TPMS sensor.

3.
Remove the sensor body (A) in the direction of the arrow.

4.
Use the valve mounting tool to pull out the valve until it is entirely out of the lower hole.
   
•
Do not reuse the snap-in type TPMS sensor.

   
•
Cut the rubber(A) at the bottom of valve with a knife.

5.
Apply lubricant to the surface of the new valve, and then mount it through the valve hole of the wheel.
Specified lubricants : soap water or YH100 (Lubricant for tire insert)
   
•
After applying the lubricant, it should not be longer than 5 minutes until the valve is mounted.
•
"(If the lubricant is applied for more than 5 minutesApply lubricant again)"

   
•
The TPMS sensor valve bottom is not properly sealed if it is not fully mounted on the wheel, as shown in the following figure:
•
Make sure that the valve body is pulled entirely through the hole.

6.
Apply soapy water or lubricant to the upper/lower bead section of the tire.

7.
To fit the bottom bead, position the sensor at the 5 o’clock position relative to the head on the tire changing machine

8.
Rotate the rim clockwise, and push down on the tire at the 3 o’clock position to fit bottom bead.
   
•
Place the tire on the rim so the bottom bead touches the edge of the rim after the sensor (6 o’clock).

9.
Push down on the tire at the 3 o’clock position and rotate the rim clockwise to fit the top bead.

10.
Inflate the tire until beads seat.

11.
Adjust the tire pressure according to the recommended tire pressure for the vehicle.
Specified tire pressure : Refer to "Specification"
12.
If the TPMS sensor malfunctions, you must perform TPMS sensor learning. Replace any faulty sensors and perform TPMS sensor learning.
Diagnostic Procedure Using a Diagnostic Instrument
The following section describes how to diagnose faults using a diagnostic instrument.
1.
Connect the diagnostic instrument to the self-diagnostic connector (16-pin) beneath the crash pad on the side of driver's seat, and then turn on the ignition to activate the diagnostic instrument.
2.
In the GDS Vehicle Type Selection menu, select "Vehicle Type" and "TPMS" System, and then opt for "OK."
[Register Sensor Method]

   
•
Check that Write ID and Read ID are the match.
•
After successfully registering the sensor, perform "Sensor Wireless Information" to confirm that the sensor operates properly.

[Sensor Status Method]

   
•
Each entry must be checked for normal operation of each sensor.
•
After replacing the tires or sensors, check for proper operation of sensor after sensor registration process.

TPMS Receiver

Description and operation
Description
TPMS Receiver : BCM(body control module) integrated management

1.
Early state
•
Platform information and sensor ID are not input.
2.
Normal State
•
To detect tire air pressure and DTC, the receiver must be in normal operation.
•
The receiver can check the position and information of the sensor.
Operation
1.
General Function
•
Auto-learn takes place only once per Ignition cycle.
•
After this process is successfully completed, it is input into four sensor ID storage devices.
•
Until the end of automatic learning, if there is a drop in air pressure and air leakage, the previously learned sensor and each wheel position are detected.
•
Preliminary tire expansion and DTC status are not indicated.
2.
General Conditions to Learn New Sensors
•
Automatic learning works only when the speed is over 15.5 mph (25 kph).
•
Typical time at driving continuously over 15.5 mph(25 kph) to learn a new sensor is up to 10 minutes.
3.
General Conditions to Un-Learn a sensor that is removed
•
It takes less than 10 minutes at 15.5 mph(20-30 kph).
•
It depends on the speed of the vehicle and the number of sensors input to the receiver.
Repair procedures
Replacement
[TPMS Receiver (Integrated Body Unit (IBU))]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Remove the glove box.
(Refer to Body - "Glove Box")
3.
Remove the IBU (A) after loosening the mounting nuts and bolt.

4.
Remove the IBU after disconnecting the connector.

5.
To install, reverse the removal procedures.
6.
learn by connecting diagnostic tool.
7.
Perform TPMS test to check for any abnormality.
Diagnosis procedure by using diagnostic device
The main contents of diagnostic method using diagnostic device are as follows:
1.
Connect self-diagnosis connector (16 pins) located in the lower driver side crash pad to self-diagnosis device, and then turn on the self-diagnosis device after key is ON.
2.
Select the "vehicle model" and "TPMS" on GDS vehicle selection screen, then select OK.
[Vehicle Name Writing Method]

[Wheel Sensor ID Writing Method]

Inspection
1.
Check the vehicle code, VIN, sensor ID storage and normal storage in the receiver.
2.
Check if the TPMS receiver [Integrated Body Unit (IBU)] status is normal.
3.
Check whether the TPMS warning light is off and DTC.
Tires/Wheels
Tire Repair procedures Tire Wear1.Measure the tread depth of the tires. Tread depth [limit] : 1.6 mm (0.0630 in.)2.If the remaining tread depth (A) is less than the limit, replace the t ...