Inspection Procedure

(REFERENCE) INSPECTION USING OSCILLOSCOPE 

1. Check the input signal waveform.
   1. Remove the combination meter assy.
   2. Connect the oscilloscope to the terminals C9-9 and C11-13 of combination meter connector.
   3. Start engine.
      Fig 1: Connecting Oscilloscope Terminals C9-9 And C11-13

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Check the signal waveform.
   ITEM REFERENCE CHART
   
   

   Item	Contents
   Tool setting	5 V/ DIV, 20 ms/ DV
   Vehicle condition	Engine idle speed

   Fig 2: Checking Signal Waveform

   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 terminals 5 (TACH) of engine ECU and C11-13 of combination meter connector (See TERMINALS OF ECU ).

   Standard: There is continuity. 

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