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 C11-5 and C9-9 of combination meter connector.
   3. Start engine.
      Fig 1: Connecting Oscilloscope Terminals C11-5 And C9-9

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

   Item	Contents
   Tool setting	5V/DIV, 100 ms/ DV
   Vehicle condition	Engine idle speed

   Fig 2: Checking Signal Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   WAVEFORM CONDITION
   
   

   A	NG
   B	OK

1. B: CHECK AND REPLACE COMBINATION METER ASSY 
2. A: GO TO NEXT STEP 

1. Remove the combination meter.
2. Check the continuity between terminals 14 (THWO) of engine ECU and C11-5 of combination meter connector (See TERMINALS OF ECU ).

   Standard: There is continuity. 

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