Inspection Procedure

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND) 
   1. Disconnect the A24 and D74 ECM connectors.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE
      
      

      Tester Connection	Condition	Specified Condition
      D74-81 (E1) - Body ground	Always	Below 1 Ω
      D74-42 (E02) - Body ground
      D74-43 (E01) - Body ground
      D74-82 (ME01) - Body ground

   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE
      
      

      Tester Connection	Condition	Specified Condition
      A24-1 (BATT) - Body ground	Always	11 to 14 V
      A24-2 (+B2) - Body ground	When battery's positive (+) voltage is applied to terminal MREL
      A24-3 (+B) - Body ground	When battery's positive (+) voltage is applied to terminal MREL
      A24-34 (MREL) - Body ground	Ignition switch OFF

      Fig 1: Identifying A24 And D74 ECM Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE TABLE
      
      

      Result	Proceed to
      OK (for 1GR-FE)	A
      OK (for 2UZ-FE)	B
      OK (for 3UR-FE)	C
      NG	D

   B: REPLACE ECM  (See REMOVAL )

   C: REPLACE ECM  (See REMOVAL )

   D: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   A: REPLACE ECM  (See REMOVAL )