Inspection Procedure

1. Check output value of ECM.
   1. Connect the hand-held tester to DLC3.
   2. Turn the ignition switch to ON and push the hand-held tester main switch ON.
   3. Select the DATA LIST mode on the hand-held tester.
      DATA LIST DISPLAY
      
      

      Item	Condition	Specified Condition	Measurement Item / Range (Display)
      ENGINE SPD	With Engine Idling	650 - 750 RPM	Engine Speed / Min.: 0 RPM, Max.: 16,383 RPM

1. NG: Go To Engine Control System 
2. OK: Go to next step 

(REFERENCE) INSPECTION USING OSCILLOSCOPE 

1. Check the input signal waveform.
   1. Remove the combination meter assy with connectors still connected.
   2. Connect the oscilloscope to the terminals C11-27 of combination meter assy and body ground.
      Fig 1: Locating TACHO Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Start engine.
   4. Check the signal waveform.
      ITEMS CONTENTS
      
      

      Item	Contents
      Tool setting	10 V/ DIV, 20 ms/ DV
      Vehicle condition	Engine idle speed

      Fig 2: Oscilloscope OF Signal At Combination Meter Tachometer Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Check And Replace Combination Meter Assy 
2. NG: Go to next step. 

1. Remove the combination meter.
2. Check the continuity between terminals 5 (TACH) of ECM and C11-27 of combination meter connector.

   Standard: There is continuity. 

1. NG: Repair Or Replace Harness Or Connector 
2. OK: Check And Replace ECM