Throttle Body: Testing and Inspection
Electric Throttle Body Assembly On-vehicle InspectionWARNING: Never touch throttle valve with finger while ignition mode of keyless push start system is in "ON" and accelerator pedal is depressed. Otherwise, injury may result from getting a finger caught between throttle valve and throttle body.
CAUTION:
- Do not disassemble electric throttle body assembly.
- Do not drop electric throttle body assembly or subject it to strong impact. If the electric throttle body assembly is subjected to strong impact it must be replaced.
- Be careful to prevent foreign materials such as dust or metallic particles from coming into contact with throttle body and throttle valve.
Otherwise, electric throttle body assembly 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, electric throttle body assembly will break down by damaging internal resinous gear of throttle valve actuator.
NOTE: After replacing electric throttle body assembly, calibrate throttle valve position.
Throttle Valve Visual Check
1. Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF".
2. Check that there is not any foreign materials caught between throttle valve and throttle body. If there is, take it out after removing throttle body and clean inside of throttle body thoroughly.
Throttle Valve Operation Check
1. Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF".
2. Disconnect connector from electric throttle body assembly.
3. Check throttle valve operation as follows. If faulty condition is found, replace throttle body.
a. Check that throttle valve (1) moves smoothly from fully closed position and fully open position with finger.
b. Check that throttle valve returns to default position.
Throttle valve default position "a":
7° from completely closed position (1)
Electric Throttle Body System Operation Check
1. Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF".
2. Push engine switch to change the ignition mode to "ON".
3. Check electric throttle body system as follows.
If faulty condition is found, go to step 4).
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 applicable position.
Throttle valve opening angle "a":
3 to 15° from completely closed position (1)
4. Check the following points:
If check results are not satisfactory, replace throttle body assembly.
- Wire harness and connections
- APP sensor: APP Sensor Inspection
- TP sensor
- Throttle motor
Throttle Motor Check
1. Disconnect connector from electric throttle body assembly with ignition mode of keyless push start system in "OFF".
2. Measure resistance between terminals "1" and "2" of throttle body assembly.
If faulty condition is found, replace electric throttle body assembly.
Throttle motor resistance
0.3 - 100 Ohms at 20 °C (68 °F)
Throttle Position (TP) Sensor Performance Check
1. Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF".
2. Disconnect connector from electric throttle body assembly.
3. Check TP sensor (main and sub) output voltage as follows.
If faulty condition is found, replace throttle body.
a. Connect 3 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.
