Inspection Procedure

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

1. READ VALUE OF INTELLIGENT TESTER (ENGINE SPEED SIGNAL)*1 
   1. Check the DATA LIST for proper functioning of the engine speed signal.

      ECM 

      DATA LIST - ECM
      
      

      Item	Measurement Item / Range (Display)	Normal Condition	Diagnostic Note
      ENGINE SPD	Engine speed / Min.: 0 rpm, Max.: 16,383 rpm	Idling: 650 to 750 rpm	-

      OK: 

      Engine speed display on the tester is almost the same as the actual engine speed. 

   NG : GO TO  ENGINE CONTROL SYSTEM (1NZ-FE) -- xB 

   OK : Go to Next Step 

2. CHECK COMBINATION METER ASSEMBLY*2 
   1. Disconnect the C6 meter connector.
   2. Using an oscilloscope, check the signal waveform of the meter.
      TESTER CONNECTION VEHICLE CONDITION
      
      

      Tester Connection	Tool Setting	Vehicle Condition
      C6-26 - Body ground	5 V/DIV., 10 msec./DIV.	Engine idle speed

      OK: 

      As shown in the illustration. 

   OK : REPLACE COMBINATION METER ASSEMBLY 

   Fig 1: Identifying C6 Meter Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : Go to Next Step 

3. CHECK WIRE HARNESS (COMBINATION METER - ECM) 
   1. Disconnect the C6 meter connector.
   2. Disconnect the E4 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      C6-30 - E4-1 (TACH)	Below 1 Ω
      C6-30 - Body ground 10	kΩ or higher

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 2: Identifying C6 Meter And E4 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE ECM