Toyota Workshop Service and Repair Manuals

Throttle Body: Testing and Inspection
On-Vehicle Inspection

ON-VEHICLE INSPECTION 

1. Inspect throttle body.

(a) Check that the throttle linkage moves smoothly.

(b) Check the vacuum at each port.

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Start the engine.

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Check the vacuum with your finger.

2. Inspect throttle position (TP) sensor.

(a) Disconnect the TP sensor connector.

Terminal Identification

(b) Apply vacuum to the throttle opener.