Electronic Throttle Actuator: Testing and Inspection
Electric Throttle System On-Vehicle InspectionWARNING: Never touch throttle valve with finger while ignition switch is in ON position and accelerator pedal is depressed. Otherwise, injury may result by pinching the finger between throttle valve and throttle body.
CAUTION:
- Do not disassemble throttle body.
- Do not drop otherwise give excessive shock to throttle body. Throttle body that has experienced any excessive shock must be replaced.
- Be careful not to accurate foreign materials (like dust and metallic particle) to throttle body and throttle valve. Otherwise, throttle body will break down by throttle valve accretion.
- Do not apply excessive force to throttle valve for throttle valve operation check and TP sensor performance check. Otherwise, throttle body will break down by damaging internal resinous gear of throttle valve actuator.
NOTE: After replacing throttle body, calibrate throttle valve position.
Electric Throttle Body System Operation Check
1. Turn off ignition switch.
2. Remove engine cover.
3. Remove air cleaner outlet hose (1).
4. Check that there isn't any foreign matter caught between throttle valve (1) and throttle body (2). If there is, take it out after removing throttle body and clean inside of throttle body thoroughly.
5. Check throttle valve (1) operation as follows.
If faulty condition is found, replace throttle body.
Throttle valve default position "a":
22° - 27° from completely closed position (1)
a. Check that throttle valve (1) moves smoothly from fully closed position to fully open position with your finger.
b. Check that throttle valve returns to default position when you move finger off throttle valve at fully closed position and fully open position.
6. Turn ignition switch to ON position.
7. Check electric throttle body system as follows.
If faulty condition is found, go to step 8).
a. Depress accelerator pedal gradually and check that throttle valve moves smoothly until it opens fully.
b. Release accelerator pedal and check that throttle valve moves back to default position.
8. Check the following. If check results are satisfactory, replace throttle body.
- Wire harness and connections
- APP sensor
- TP sensor:
Refer to "Throttle Position (TP) Sensor Performance Check" under Electric Throttle System On-Vehicle Inspection:N32A.
- Throttle actuator:
Refer to "Throttle Actuator Check" under Electric Throttle System On-Vehicle Inspection:N32A.
Throttle Actuator Check
1. Turn off ignition switch.
2. Disconnect connector from throttle body.
3. Measure resistance between terminals "1" and "2" of electric throttle body assembly.
If faulty condition is found, replace throttle body.
Throttle actuator resistance
1.7 - 2.1 ohms at 20 °C, 68 °F
Throttle Position (TP) Sensor Performance Check
1. Turn off ignition switch.
2. Remove air cleaner assembly.
3. Remove air cleaner outlet hose.
4. Disconnect connector from electric throttle body assembly.
5. Check TP sensor (main and sub. output voltage as follows.
If faulty condition is found, replace throttle body.
a. Connect three new 1.5 V batteries (1) in series and check that total voltage is 4.5 - 5.0 V.
b. Connect voltmeter (2) and batteries to TP sensor as shown in figure.
c. Check that voltage varies depending on throttle opening angle as shown in figure while throttle valve is opened and closed by finger.
