Throttle Body: Testing and Inspection
Electric Throttle Body Assembly On-Vehicle Inspection
CAUTION:
If you touch the throttle valve with your finger when ignition mode of keyless push start system is in the "ON" position and the accelerator pedal is depressed, your finger may be pinched in the gap between the throttle valve and throttle body housing if the accelerator pedal is released.
Never touch the throttle valve with your finger when ignition mode of keyless push start system is ON and the accelerator pedal is depressed.
NOTE:
Failure to take proper precautions when handling the electric throttle body assembly, may lead to malfunction of the electric throttle body assembly or damage to its components.
- Do not disassemble the electric throttle body assembly.
- Do not drop or otherwise expose the electric throttle body assembly to large shock. Any electric throttle body assembly that has received large shock should be replaced.
- Keep the throttle body housing and/or throttle valve free of dust, metallic particles or other foreign materials.
- Do not apply undue forces to the throttle valve when checking operation of the throttle valve or performance of the TP sensor; otherwise the plastic gears in the throttle valve actuator will be damaged.
NOTE:
After replacing electric throttle body assembly, calibrate throttle valve position. Testing and Inspection
Throttle Valve Visual Check
1) Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF". Air Cleaner Components
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 Body Assembly Removal and Installation
Throttle Valve Operation Check
1) Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF". Air Cleaner Components
2) Disconnect connector from electric throttle body assembly.
3) Check throttle valve operation as follows.
If faulty condition is found, replace throttle body. Throttle Body Assembly Removal and Installation
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". Air Cleaner Components
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 Body Assembly Removal and Installation
Throttle motor resistance
0.3 - 100 ohms at 20 °C (68 °F)
TP Sensor Performance Check
1) Remove air cleaner outlet hose with ignition mode of keyless push start system in "OFF". Air Cleaner Components
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. Throttle Body Assembly Removal and Installation
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.
