Inspection Procedure

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step  4 when not using handheld tester.

1. PERFORM ACTIVE TEST BY HAND-HELD TESTER 
   1. Operate the hand-held tester according to the steps on the display and perform the "ACTIVE TEST".

      MTR (Combination meter): 

      ACTIVE TEST (MTR (COMBINATION METER))
      
      

      Item	Test Details	Diagnostic Note
      SPEED METER	0 / 40 / 80 / 120 / 160 / 180 / 200	-

   1. NG: REPLACE COMBINATION METER ASSY (SEE  OVERHAUL  ) 
   2. OK: Go to next step 
2. READ VALUE OF HAND-HELD TESTER 
   1. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".

      MTR (Combination meter): 

      VALUE OF HAND-HELD TESTER (MTR (COMBINATION METER))
      
      

      Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
      SPEED METER	Vehicle speed / Min.: 0 km/h, Max.: 255 km/h	Almost same at the meter speed (When driving)	-

   1. OK: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ) 
   2. NG: Go to next step 
3. READ VALUE OF HAND-HELD TESTER 
   1. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".

      ABS (Skid control ECU): 

      VALUE OF HAND-HELD TESTER (ABS (SKID CONTROL ECU))
      
      

      Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
      SPD1	Vehicle speed / Min.: 0 km/h, Max.: 255 km/h	Almost same at the meter speed (When driving)	-

   1. NG: GO TO BRAKE SYSTEM (See  PRECAUTION  ) 
   2. OK: Go to next step 
4. INSPECT COMBINATION METER ASSY 

   INSPECTION USING OSCILLOSCOPE 

   1. Check the input signal waveform.
      1. Remove the combination meter assy.
      2. Connect the oscilloscope to the terminals C9-18 and C9-1 of the combination meter assy.
      3. Start the engine.
      4. Check the signal waveform.
         ITEM AND CONTENTS
         
         

         Item	Contents
         Tool setting	5 V/ DIV, 20 ms/ DIV
         Vehicle condition	Driving at approx. 20Km/h

         Fig 1: Identifying Combination Meter Assy Terminals C9-18 And C9-1

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         HINT:

         As the vehicle speed increases, the cycle of the signal waveform narrows.

         Fig 2: Identifying Signal Waveform Graph

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ) 
   2. NG: Go to next step 
5. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU ASSY AND COMBINATION METER ASSY) (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
   1. Disconnect the C9, S1 connectors.
   2. Measure the resistance according to the value(s) in SKID CONTROL ECU ASSY AND COMBINATION METER ASSY TERMINALS RESISTANCE  .

      Standard: 

      SKID CONTROL ECU ASSY AND COMBINATION METER ASSY TERMINALS RESISTANCE
      
      

      Tester Connection	Specified Condition
      C9-18 - S1-12	Below 1 Ω
      C9-18 - Body ground	10 kΩ or higher
      C9-1 - Body ground	Below 1 Ω

      Fig 3: Disconnecting Combination Meter Assy C9, S1 Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: GO TO BRAKE SYSTEM (See  PRECAUTION  ) 
   2. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR