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.

   NG: GO TO ENGINE CONTROL SYSTEM 

   OK: GO TO next step 

Fig 1: Identifying Tachometer Connector Terminal C9-19

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(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 C9-19 of combination meter assy and body ground.
   3. Start engine.
   4. Check the signal waveform.

      NG: CHECK HARNESS AND CONNECTOR (BETWEEN ECM AND COMBINATION METER ASSY) 

      OK: CHECK AND REPLACE COMBINATION METER ASSY 

      SIGNAL WAVEFORM CHECK
      
      

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

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