Inspection Procedure

HINT:

Operating the engine 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) 
   Fig 1: Identifying A13, A14, E2 And E3 ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the A13, A14, E2 and E3 ECM connectors.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      E3-1 (E1) - Body ground	Always	Below 1 Ω
      E2-2 (E01) - Body ground	Always	Below 1 Ω
      E2-1 (E02) - Body ground	Always	Below 1 Ω
      A13-5 (E03) - Body ground	Always	Below 1 Ω
      E3-4 (E04) - Body ground	Always	Below 1 Ω
      E2-5 (ME01) - Body ground	Always	Below 1 Ω
      A14-1 (EC) - Body ground	Always	Below 1 Ω

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

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A14-7 (BATT) - Body ground	Always	11 to 14 V
   A13-1 (+B2) - Body ground	When battery's positive (+) voltage Is applied to terminal A14-3 (MREL)	11 to 14 V
   A13-2 (+B) - Body ground	When battery's positive (+) voltage is applied to terminal A14-3 (MREL)	11 to 14 V
   A14-5 (FC) - Body ground	Engine switch on (IG)	11 to 14 V

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM  (See REMOVAL )