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 (COMBINATION METER ECU - BATTERY AND BODY GROUND) 
   1. Disconnect the J28 combination meter ECU connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE
      
      

      Tester Connection	Condition	Specified Condition
      J28-40 (E1) - Body ground	Always	Below 1 Ω

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

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE
      
      

      Tester Connection	Switch Condition	Specified Condition
      J28-18 (B) - Body ground	Always	11 to 14 V
      J28-20 (IG+) - Body ground	Ignition switch ON

      Fig 1: Identifying J28 Combination Meter ECU Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )