Hyundai Creta: Engine Control System / ETC (Electronic Throttle control) System

Description and operation

Description
The Electronic Throttle Control (ETC) System consists of a throttle body with an integrated control motor and throttle position sensor (TPS). Instead of the traditional throttle cable, an Accelerator Position Sensor (APS) is used to receive driver input. The ECM uses the APS signal to calculate the target throttle angle; the position of the throttle is then adjusted via ECM control of the ETC motor. The TPS signal is used to provide feedback regarding throttle position to the ECM. Using ETC, precise control over throttle position is possible; the need for external cruise control modules/ cables is eliminated.

Schematic diagrams

Schematic Diagram

Specifications

Specification
[Throttle Position Sensor (TPS)]
[TPS 1]
Item
Opening Percentage (%)
Output Voltage(V) [Vref = 5V]
C.T
5.1 ~ 8.1
0.17 ~ 0.27
W.O.T
56.4 ~ 64.4
1.86 ~ 2.13

[TPS 2]
Item
Opening Percentage (%)
Output Voltage (V) [Vref = 5V]
C.T
59.7 ~ 60.9
1.97 ~ 2.01
W.O.T
0.6 ~ 7.6
0.02 ~ 0.25

  
Reference Voltage = 5V (Sensor output Max. Voltage = 3.3V)
[ETC Motor]
Item
Sensor Resistance
Coil Resistance (Ω)
0.3 ~ 100 [20°C (68°F)]

Troubleshooting

Waveform

Schematic diagrams

Circuit Diagram
(M/T)

(A/T)

Troubleshooting

Fail-safe Mode
Items
Fail-safe
ETC Motor
Throttle valve stuck at 5°
TPS
TPS 1 fault
Replace it with TPS2
TPS 2 fault
Replace it with TPS1
TPS 1,2 fault
Throttle valve stuck at 5°
APS
APS 1 fault
Replace it with APS2
APS 2 fault
Replace it with APS1
APS 1,2 fault
Throttle valve stuck at 5°

  
When throttle value is stuck at 5°, engine speed is limited at below 1,500 rpm and vehicle speed at maximum 40 ~ 50 km/h (25 ~ 31 mph)

Repair procedures

Inspection
Throttle Position Sensor (TPS)
1.
Connect a GDS on the Data Link Connector (DLC).
2.
Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T.
Specification : Refer to Specification Section.
ETC Motor
1.
Turn the ignition switch OFF.
2.
Disconnect the ETC module connector.
3.
Measure resistance between the ETC module terminals 3 and 6.
4.
Check that the resistance is within the specification.
Specification : Refer to Specification Section.
ETC System Initialization
When ignition switch is turned from OFF to ON, ETC system learns the throttle angle in 1 sec.
1.
Throttle valve moves from limp-home position to close position.
2.
And then, it opens to about 15° and moves to limp-home position.
Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Remove the resonator and the air intake hose.
(Refer to Engine Mechanical System - "Air Cleaner")
3.
Disconnect the ETC module connector.
4.
Disconnect the coolant hoses (A).
5.
Remove the installation bolts (B), and then remove the ETC module from the engine.

Installation
  
Install the component with the specified torques.
Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
1.
Install in the reverse order of removal.
Electronic throttle control module Installation bolt :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
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