Throttle Body: Testing and Inspection
THROTTLE BODY INSPECTIONNOTE: Perform the following inspection only when directed.
Resistance Inspection
1. Remove the throttle body.
2. Verify that there is no continuity between the throttle body and throttle body each terminal using an ohmmeter.
- If not as specified. replace the throttle body.
3. Measure the resistance between the throttle actuator terminals using an ohmmeter.
- If not as specified, replace the throttle body.
- If as specified, carry out the "Circuit Open/ Short Inspection".
Throttle Actuator Resistance:
Throttle actuator resistance
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for open or short (continuity check).
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the wiring harness.
- Throttle body terminal A (wiring harness-side) and PCM terminal 1B
- Throttle body terminal B (wiring harness-side) and PCM terminal 1C
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
- Throttle body terminal A (wiring harness-side) and power supply
- Throttle body terminal A (wiring harness-side) and GND
- Throttle body terminal B (wiring harness-side) and power supply
- Throttle body terminal B (wiring harness-side) and GND
Throttle Valve Inspection
1. Remove the throttle body.
2. Open the throttle valve from the closed position to open the fully position by hand.
3. Verify that the throttle valve moves smoothly.
- If cannot be verified, replace the throttle body.
4. Release hand from the throttle valve when at the fully open position.
5. Verify that the throttle valve returns to the closed position smoothly by spring force.
- If cannot be verified, replace the throttle body.
6. Press the throttle valve from the closed position to the fully closed position by hand.
7. Verify that the throttle valve move approx. 5°.
- If cannot be verified, replace the throttle body.