Hyundai Accent (HC): Suspension System / Tire Pressure Monitoring System

Contents:

• Components and Components Location
• Schematic Diagrams
• Description and Operation
• TPMS Sensor
• TPMS Receiver

Components and Components Location

- Components

1. TPMS Receiver
2. TPMS Sensor (FL)
3. TPMS Sensor (RL)
4. TPMS Sensor (RR)
5. TPMS Sensor (FR)

Schematic Diagrams

- TPMS Schematic Diagram

- Terminal Function

Pin No.	Function	Description
1	Battery	VBAT
2	IG ON	Battery to IG ON
3	CAN_High	CAN_High
4	CAN_Low	CAN_Low
5	Ground	Battery to ground
6	-	-

Description and Operation

- Description 1. System Description

   

AL: Auto LearningCAN: Controller Area NetworkECU: Electronic Control UnitIC: Instrument ClusterMIL: Malfunction Indicator LEDRF: Radio FrequencyWE: Wheel ElectronicWU: Wheel Unit

The TPMS monitors the pressure and temperature of a vehicles tire to alert on pressure variations that may impact the driving conditions. Messages deduced from processed data are displayed at the Instrument Cluster (IC) via 2 warning lamps. In parallel, the ECU executes error evaluation on input and output signals. Pressure monitoring during parking is provided.The ECU processes data from the WE sensor, determines the state of the tires and communicates the required warning message via the hard wire line to the driver.2. Functional Description Warning ThresholdsHard WarningOne non temperature compensated hard warning threshold applies to front and rear axle of vehicle. If the pressure reported by the WE sensor is below the tire-specific minimum pressure then the low pressure warning telltale is illuminated. A warning is reset when tire pressure is reported to be at 207kPa (30psi).

   

TPMS warning light can be litdue to the tire pressure reduction by low temperature in cold weather.

Fast Pressure Loss Fast pressure loss function is deactivated during parking and only active while driving. So it abovids that a warning is set when the driver manually deflates the tire to a level above hard warning threshold.Upon a rapid pressure decrease the WE emits a delta-p telegram which triggers the fast pressure loss function to start. Including the first dp-telegram the function waits for a 2nd telegram of the same wheel electronic and calculates the pressure loss rate. If the pressure drops by more than 20kPa/min, a "fast pressure loss" warning is generated and displayed with a maximum of 60s delay while driving.Initialization The initialization function determines which WE sensor identifier belongs to the vehicle.The corresponding set of identifiers is stored in the ECU memory and used to determine if a received RF telegram comes from a wheel unit, which belongs to the vehicle.Only telegrams containing known (initialized) identifiers are being supervised in the warning algorithm.The initialization function is implemented in two independent parts: as an auto learning function.Initialization-auto Learning AL starts every time, the vehicle was parked long enough to change or permute wheels (19min), and is traveling again at a speed that ensures that the WE sensors are transmitting.AL is automatically considering all WE identifiers received and extracts, based on statistical evaluation, IDs belonging to the WEs mounted on the vehicle. If new (unknown) IDs are detected, their recurrence will be tracked by AL.AI compares the acceleration reported by the wheel unit to the vehicle speed to rule out transmissions received from neighboring vehicles traveling with different speeds.A WE sensor identifier is assigned to the vehicle when 8 RF telegrams have been received while driving above 25km/h.

TPMS Sensor

- Description

1.General descriptionWU is a sensor placed in the tire that reports pressure and temperature.The WU is mounted inside the wheels, fixed to the valve. The angle between the valve and the housing of the WU is variable.This allows adaptation to various types of rims.The Wheel Unit is made of a PCB supporting the electronic hardware and encapsulated inside a housing which is potted with polyurethane.It is self-powered by a battery and includes all systems for parameter measurement (pressure, temperature and centrifugal acceleration and optionally rotation direction), RF transmission and LF detection.To achieve the specified battery lifetime, the WU supports various measurement and transmission timings, depending on WU operation mode.For RF transmission, WU uses an internal antenna.

2.First Block Mode: When vehicle start driving, Sensor enter Mode First Block. Typical period of RF emissions is 16 sec. for 40 times for Auto-learning and Auto-location function.

3.Driving Mode: After 19 min. parking and then finishing Mode First Block mode, WU enter Driving mode.Typical period of RF emissions are 64 sec above 4g vehicle speed.

4.Parking Mode: at below 3g Vehicle speed, enter Parking mode. Typical periodicities of RF emissions are 13 hours.

- Removal

1.Remove the valve core and deflate the tire.

2.Remove the side of the tire bead area from the wheel using tire changing machine.

   

• The tire bead should be broken approx. 90° from the valve side of the wheel. The bead breaker should not be set too deep.

• Avoid tire/tool contact with the valve on dismount.

• Dismount should end near the valve.

3.Rotate the wheel clockwise.

4.The valve during transportation (air inlet portion of the silver) deviated from its original location be sure to check whether the original position of the valve (metal brackets) are assembled in indented state.

5.While tightening the nut on the valve as not to deviate from the fixed position while rotating the valve to a fixed location (metal brackets to fit inside) and push. The specified torque (8Nm) to tighten the nut does not reuse.

6.Contact with the rim so that the valve washer seals the valve hole put into.

7.Housing with two fingers holding the valve in the axial direction with one finger and push the valve.

8.Housing, the state must be visible laser marking.

9.When the valve is fully inserted so that the contact between the sensor and the rim while keeping hands on the wheel nut tightening will start Wed.

10.While maintaining the position of the valve and the sensor is mounted nut.

11.Apply tire soap or lubrication to the top and bottom tire beads.

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

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

14.After bottom bead is on tire, rotate the rim until the sensor is at the 5 o’clock position relative to the head on the tire changing machine. Push down on the tire at the 3 o’clock position and rotate the rim clockwise to fit the top bead.

15.Inflate the tire until both beads seat.

16.In the case of TPMS sensor failure, TPMS sensor needs learning. Faulty sensor is replaced new units, conduct learning of TPMS sensors.

- Inspection After installing TPMS sensor test methods Thai

1.Sealing washer on the outside rim of hole to be compressed.

2.The lower part of the valve housing, a fixed place (no metal brackets) should be located.

3.Housing is at least one or more points on the surface of the rim should contact.

4.The rim of the housing mounting height shall not exceed the height of the chin.

Diagnosis procedure by using diagnostic device As manual for diagnosis methods by using diagnosis device, the main contents are as follows:

1.Connect self-diagnosis connector(16pins) located in the lower of driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

2.Select the "vehicle model" and "TPMS" on GDS vehicle selection screen, then select OK.

- 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."[Initial Screen for Sensor ID Registration]

[Register Sensor function description]

[Preparation phase sensor measurements]

[Sensor register method 1]

[Sensor register method 2]

[Sensor register method 3]

[Sensor register method 4]

[Sensor register method 5]

   

• Make sure that the read ID matches the written ID.

• After successfully registering the sensor, proceed to "Sensor Wireless Information" to ensure that the sensor functions correctly.

[Sensor Status initialization]

[Sensor function description]

[Preparation phase sensor measurements]

   

• In North America, the cable is measured separately.

• In Domestic/General(European) area, the cable is measured without separation.

[Sensor measurements 1]

[Sensor measurements 2]

[Sensor Status]

   

• Check each sensor component to ensure that it functions correctly.

• Replace any tires or sensors that do not function correctly, proceed to the sensor registration procedure, and check if the sensors function correctly.

TPMS Receiver

- Description

1.FunctionThe TPMS monitors the pressure and temperature of the tires and warns the driver of changes that could potentially influence driving conditions.The cluster warning lamp displays the messages generated from processing the data. The ECU processes the data received from the WE sensor, determines the conditions of the tire, and then sends any necessary warning signals to the driver through the CAN line or hard wire control line.

2.Mode

(1)Virgin Mode

• This mode is active when a unit is stocked as a part for after-sales service, meaning that there is no data concerning the vehicle code, wheel size, and sensor ID stored in its memory.

• In this mode, the receiver does not save any RF signals it receives from the pressure sensors, nor does it control the warning lamp.

• It also does not detect or memorize DTCs, and it does not perform the Auto Learning and Auto Location functions.

• After turning the ignition on, use a diagnostic instrument (GDS etc.) or TPMS exciter to enter the vehicle code/wheel size/sensor ID. This changes the current mode to Normal.

(2)Normal Mode

• This is the mode applied when the vehicle is shipped from the factory.

• It performs all of the standard TPMS functions.

• Check the system warning lamp (TPMS lamp) to determine the current mode of the TPMS receiver.

• In virgin mode: When the IG turns ON, it remains ON for 3 seconds and then blinks every half second.

• In normal mode: When the IG turns ON, it remains ON for 3 seconds and then turns OFF. (However, it remains ON if a DTC exists.)

- Operation

1.General Function

• Auto-locate/learn takes place only once per Ignition cycle.

• On successful completion, 4 road wheel sensor ID's, together with their respective road wheel positions are latched into memory for monitoring.

• Until Auto-learn completes, previously learned sensors (together with their respective locations) are monitored for under inflation / leak warnings.

• Spare tire inflation / DTC state is not displayed.

2.General Conditions to Learn New Sensors:

• Receiver must Auto-Locate 4 road sensors.

• Auto-location / learning only functions when speed is more than 20 kph (approx. 15 mph).

• Receiver must determine that it is confident that sensor is not temporary:

a.Uses vehicle speed.

b.Uses confidence reduction of previously learned sensors.

• Typical time at driving over 20 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 20-30kph.

• Confidence reduction is dependant on vehicle speed and the number of sensors known to the receiver.

- Replacement

1.Disconnect the negative (-) battery cable.

2.Remove the crash pad.(Refer to Body - "Crash Pad")

3.Remove the connector.

4.Remove the bracket (B) and receiver (C) by loosening the nut (A).

Tightening torque :3.9 - 5.9 N.m (0.4 - 0.6 kgf.m, 2.9 - 4.3 lb-ft)

5.Install in the reverse order of removal.

6.Re-connect the battery, and then turn on the ignition.

   

• Firmly fasten the receiver connector until you hear a click.

7.Replace the receiver, and then perform the learning process using a diagnostic instrument (GDS).

- 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."

[Wheel Sensor ID Writing (Wireless)]

[Vehicle Name Writing]

[VIN Writing]