ETC (Electronic Throttle Control) System

Specifications

Specification

Sensor

Item		Opening Percentage (%)	Output Voltage (V) [Vref = 5 V]
TP1	THA	8,5 - 11,5	0,43 - 0,58
	THW	88 - 96	4,40 - 4,80
TP2	THA	88,5 - 91,5	4,43 - 4,58
	THW	2 - 10	0,10 - 0,50
Fail-safe		Throttle Valve Stuck at 5°
Supply Voltage (V)		4,8 - 5,2
Type		Non-Contact Hall IC Sensor [built into ETC module]

Motor

Item	Specification
Coil Resistance (Ω)	0,3–100 [20 °C]
Maximum Allowable Current (A)	< 10,0
Type	DC Motor [Built into ETC Module]

Description and Operation

Description

The Electronic Throttle Control (ETC) system consists of a throttle body with an integrated control motor and a throttle position sensor (TPS). Instead of a conventional throttle cable, the accelerator pedal position is used. The Accelerator Position Sensor (APS) is used to receive input from the driver. The ECM uses the APS signal to calculate the target throttle position. The throttle valve is then adjusted by the ECM through control of the ETC motor. The TPS signal is used to provide throttle position feedback to the ECM. Precise control of throttle position is possible with ETC; the need for external cruise control modules/cables is eliminated.

1. Dry Bearing 2. DC Motor 3. Non-contact Hall Sensor 4. Gear

5. Magnet 6. Hall IC 7. Clamp 8. Stator

Schematic Diagram

Circuit Diagrams

Wiring Diagram

[A/T]

[M/T]

Repair Procedures

Inspection

Throttle Position Sensor (TPS)

1. 1
   Connect the KDS to the Data Link Connector (DLC).
2. 2
   Start the engine and measure the output voltage of TPS 1 and 2 at TP and VOT.

   Item		Opening Percentage (%)	Output Voltage (V) [Vref = 5 V]
   TP1	THA	8,5 - 11,5	0,43 - 0,58
   	THW	88 - 96	4,40 - 4,80
   TP2	THA	88,5 - 91,5	4,43 - 4,58
   	THW	2 - 10	0,10 - 0,50

3. 3
   Turn the ignition off.
4. 4
   Disconnect the ETC module connector.
5. 5
   Measure the resistance between terminals 1 and 2 of the ETC module.
6. 6
   Make sure the resistance is within specification.

   Specification: 0.3–100 Ω [20 °C]

ETC Motor

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Remove the air cleaner. (Refer to Engine Mechanical System - "Air Cleaner")
3. 3
   Disconnect the ETC module connector (A).
4. 4
   Remove the mounting bolts (B) and remove the ETC module from the engine. ETC module mounting bolt: 9.8 – 11.8 N·m

   

Cleaning

1. 1
   Remove the ETC module. (Refer to Engine Control System - "ETC System")
2. 2
   Hold the ETC module panel (A) open.

   

3. 3
   Remove deposits from the throttle body using a soft cloth moistened with cleaning solution.

   

4. 4
   After cleaning, reinstall the ETC module, then perform the ETC module learning procedure. (Refer to Engine Control System – ETC System – Adjustment)

Installation

1. Install in the reverse order of removal.

Adjustment

ETC Module Learning Procedure

Be sure to perform the ETC module learning procedure when replacing or reinstalling the ETC module.

1. 1
   Wait 1 minute with the ignition switched ON.
2. 2
   Start the engine and let it idle for 15 minutes.
3. 3
   Wait for 1 minute with the ignition switched off.
4. 4
   Restart the engine and check that the idle speed is stable.

Troubleshooting

Fail-Safe Mode

Item	Fail-safe
ETC Motor	Throttle Valve Stuck at 5°
TPS	TPS 1 Fault	ECM Reads TPS2
	APS 2 Fault	ECM Reads TPS1
	TPS 1,2 Malfunction	Throttle Valve Stuck at 5°
APS	APS 1 Malfunction	ECM Reads APS 2
	APS 2 Malfunction	ECM Reads APS 1
	APS 1,2 Malfunction	Engine Idle Condition