Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. Visually check throttle valve. 

   PREPARATION: 

   Remove the intake air resonator

   CHECK: 

   Check whether or not a foreign body exists between the throttle valve and housing. Also, check if the valve can open and close smoothly.

   Fig 1: Checking Throttle Valve & Housing

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Remove foreign body and clean throttle body. 
   2. OK: Go to next step. 
2. Check throttle control motor (See  THROTTLE BODY  ). 
   1. NG: Replace throttle control motor with magnetic clutch (See  REPLACEMENT  ). 
   2. OK: Go to next step. 
3. Check for open and short in harness and connector between ECM and throttle conform motor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Check for intermittent problems (See  PRE-CHECK   ).