Inspection Procedure

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

   METER:

   TACHOMETER TEST DETAILS
   
   

   Item	Test Details
   TACHOMETER	0rpm / 1000rpm / 2000rpm / 3000rpm / 4000rpm / 5000rpm / 6000rpm / 7000rpm

   OK: Needle indication is normal. 

   1. NG: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ) 
   2. OK: GO TO NEXT STEP. 

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

   METER:

   ITEM CONDITION CHECK REFERENCE
   
   

   Item	Measurement Item/ Range (Display)	Normal Condition
   TACHOMETER	Engine speed / Min.: 50 rpm, Max.: 12,750 rpm	Almost same as actual engine speed (When engine is running)

   OK: Engine speed displayed on the tester is almost the same as the actual engine speed. 

   1. NG: Go to step 3 
   2. OK: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ). 

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

   ALL (ECM):

   ITEM CONDITION CHECK REFERENCE
   
   

   Item	Measurement Item/ Range (Display)	Normal Condition
   ENGINE SPD	Engine speed / Min.: 50 rpm, Max.: 12.750 ram	Almost same as actual engine Speed (When engine is running

   OK: Engine speed displayed on the tester is almost the same as the actual engine speed.

   1. NG: GO TO ENGINE CONTROL SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING (2AZ-FE)  ,  HOW TO PROCEED WITH TROUBLESHOOTING (3MZ-FE)  ) 
   2. OK: GO TO NEXT STEP. 

INSPECTION USING OSCILLOSCOPE

1. Check the input signal waveform.
   1. Remove the combination meter assy.
   2. Connect the oscilloscope to the terminals C12-1 and body ground.
   3. Start the engine.
      Fig 1: Identifying Combination Meter Assy Terminal C12-1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Check the signal waveform according to the condition (s) in the table below.
      ITEM CONDITION CHECK REFERENCE
      
      

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

      OK: As shown in the illustration 

      1. NG: Go to step 5 
         Fig 2: Identifying Signal Waveform While Engine Speed Idling

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. OK: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ) 

1. Disconnect the C12 and E5 connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard:

   TESTER CONDITION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   C12-1 - E5-5	Always	Below 1 Ω
   C12-1 - Body ground	Always	10 kΩ or higher

   1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
      Fig 3: Identifying ECM Wire Harness View And Combination Meter Assy Wire Harness

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. OK: GO TO NEXT STEP. 

1. Disconnect the E5 connector.
2. Measure the voltage according to the value (s) in the table below.

   Standard:

   CONNECTORS VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   E5-5 - Body ground	Ignition switch ON	10 to 14 V

   1. NG: REPLACE COMBINATION METER ASSY (See  OVERHAUL  ) 
      Fig 4: Identifying Combination Meter Assy Terminal E5-5

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. OK: GO TO ENGINE CONTROL SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING (2AZ-FE)  ,  HOW TO PROCEED WITH TROUBLESHOOTING (3MZ-FE)  ).