Inspection Procedure

1. Operate the hand-held tester according to the steps on the display and PERFORM the "ACTIVE TEST".
   TACHOMETER TEST DETAILS
   
   

   Item	Test Details	Diagnostic Note
   TACHOMETER	0 RPM / 1000 RPM / 2000 RPM / 3000 RPM / 4000 RPM / 5000 RPM / 6000 RPM / 7000 RPM	-

1. NG: CHECK AND REPLACE COMBINATION METER ASSY 
2. OK: Go to next step. 

1. Operate the hand-held tester according to the steps on the display and select "DATA LIST".
   TACHOMETER TEST DETAILS
   
   

   Item	Test Details	Diagnostic Note
   TACHO METER	Engine speed / Min.: 0 RPM, Max.: 12,750 RPM	Almost same at the meter RPM (When engine is running)

1. OK: CHECK AND REPLACE COMBINATION METER ASSY 
2. NG: Go to next step. 

1. Operate the hand-held tester according to the steps on the display and select "DATE LIST".
   TACHOMETER TEST DETAILS
   
   

   Item	Test Details	Diagnostic Note
   TACHO METER	Engine Speed / Min.: 0 RPM, Max.: 12,750 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.
   2. Connect the oscilloscope to the terminals C10-37 and C10-30 of the combination meter connector.
   3. Start the engine.
   4. Check the signal waveform.
      ITEM CONTENTS
      
      

      Item	Contents
      Tool setting	5 V/ DIV, 10 ms/ DIV
      Vehicle condition	Engine idle speed

      Fig 1: Identifying Combination Meter Assy Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Input Signal Waveform Representation

      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 assy.
2. Disconnect the connector from ECM.
3. Check the continuity between the terminal E4-5 (TACH) of ECM and the terminal C10-37 of the combination meter connector (See COMBINATION METER ASSY ).

   Standard: Continuity. 

1. OK: CHECK AND REPLACE ECM 
2. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR