DIFFERENTIAL SYSTEM(w/ Differential Lock) ECU Power Source Circuit

WIRING DIAGRAM

*a	from Battery
*b	from IG1 NO. 2 Relay
*c	4 Wheel Drive Control ECU

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT BATTERY

   
   

   1. Check the battery voltage.

      Standard voltage
      11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1GD-FTV: Click here CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2GD-FTV: Click here CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1GR-FE: Click here CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2TR-FE: Click here CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1KD-FTV: Click here CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2KD-FTV: Click here

   OK

2. CHECK HARNESS AND CONNECTOR (+B AND IG TERMINAL)

   
   

   1. Turn the ignition switch off.

   2. 

      *a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

      Disconnect the C39 and C40 4 wheel drive control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition C39-21 (+B) - Body ground Always 11 to 14 V C40-4 (IG) - Body ground Ignition switch ON 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (+B AND IG CIRCUIT)

   OK

3. CHECK HARNESS AND CONNECTOR (GND TERMINAL)

   
   

   1. Turn the ignition switch off.

   2. Disconnect the C40 4 wheel drive control ECU connector.

   3. 

      *a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition C40-10 (GND) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)