Inspection Procedure

HINT:

Check the condition of each related circuit connector before troubleshooting (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

1. INSPECT DLC3 TERMINAL VOLTAGE (TC TERMINAL VOLTAGE) 
   1. Turn the engine switch on (IG).
   2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      K16-13 (TC) - K16-4 (CG)	Engine switch on (IG)	10 to 14 V

   3. Turn the engine switch off.
   4. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition
      K16-4 (CG) - Body ground	10 kΩ or higher

   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step   4 

   OK: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (ECM TO DLC3) 
   1. Disconnect the ECM connector.
   2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      K16-13 (TC) - A7-3 (TC)	Below 1 Ω
      K16-13 (TC) - Body ground	10 kΩ or higher

   B: REPAIR OR REPLACE HARNESS OR CONNECTOR (TC TERMINAL CIRCUIT) 

   Fig 2: Identifying DLC3 And ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   A: Go to Next Step 

3. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if the CAN communication DTC is output (See DTC CHECK / CLEAR ).

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is not output (When troubleshooting accordance with PROBLEM SYMPTOMS TABLE)	B
   DTC is output	C

   B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

   C: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

   A: REPLACE 4WD CONTROL ECU 

4. CHECK HARNESS AND CONNECTOR (ECM TO DLC3) 
   1. Disconnect the ECM connector.
   2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      K16-13 (TC) - A7-3 (TC)	Below 1 Ω
      K16-13 (TC) - Body ground	10 kΩ or higher

   Fig 3: Identifying DLC3 And ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   B: REPAIR OR REPLACE HARNESS OR CONNECTOR (TC TERMINAL CIRCUIT) 

   A: Go to Next Step 

5. CHECK HARNESS AND CONNECTOR (DLC3 CG CIRCUIT) 
   1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      K16-4 (CG) - Body ground	Below 1 Ω

   Fig 4: Identifying DLC3 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (CG TERMINAL CIRCUIT) 

   OK: Go to Next Step 

6. CHECK WARNING LIGHT (ENGINE CONTROL WARNING LIGHT) 
   1. Using SST, connect terminals TC and CG of the DLC3.

      SST 09843-18040 

   2. Check that the engine control light is blinking.

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      Engine control light is blinking	A
      Engine control light is not blinking	B

   Fig 5: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   B: REPLACE ECM 

   A: Go to Next Step 

7. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if the CAN communication DTC is output (See DTC CHECK / CLEAR ).

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is not output (When troubleshooting accordance with PROBLEM SYMPTOMS TABLE)	B
   DTC is output	C

   B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

   C: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

   A: REPLACE 4WD CONTROL ECU