Inspection Procedure

1. Turn the engine switch off.
2. Disconnect the 4WD ECU connector (A48).
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A48-1 (CANH) - A48-14 (CANL)	Engine switch off	54 to 69 Ω

Fig 1: Identifying 4WD ECU Connector (A48)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE 4WD ECU SUB BUS LINE OR CONNECTOR (CANH, CANL) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A48-30 (GND) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A48-9 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

Fig 2: Identifying 4WD ECU Connector (A48)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE 4WD ECU