Hyundai Accent (HC): Suspension System / Tire Pressure Monitoring System
Contents:
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.
Other information:
Hyundai Accent (HC) (2017 - 2022) Service Manual: Repair procedures
- Removal
1.Remove the air cleaner assembly.(Refer to Engine Mechanical System - "Air cleaner")
2.Remove the battery and battery tray.(Refer to Body Electrical System - "Battery")
3.Drain the coolant.(Refer to Engine Mechanical System - "Coolant")
4.Disconnect the position switch connector (A).
5.Disconnect the driven pully speed sensor connector (B).
Hyundai Accent (HC) (2017 - 2022) Service Manual: Description and Operation
- OBD-II Review
1. Overview
The California Air Resources Board (CARB) began regulation of On Board
Diagnostics (OBD) for vehicles sold in California beginning with the
1988 model year. The first phase, OBD-I, required monitoring of the fuel
metering system, Exhaust Gas Recirculation (EGR) system and additional
emission related components.