Component Tests and General Diagnostics

DIFFERENTIAL: ACTIVE TORQUE CONTROL 4WD SYSTEM: TC and CG Terminal Circuit
- TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the 4WD control ECU to display 2-digit DTCs by flashing the 4WD indicator light.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK DLC3 (TC VOLTAGE)

(a) Turn the ignition switch ON.





(b) Measure the voltage of the DLC3.

Standard voltage:





NG -- CHECK WIRE HARNESS (DLC3 - ECM AND BODY GROUND)
OK -- Continue to next step.

2. CHECK CAN COMMUNICATION SYSTEM

(a) Check if the CAN communication DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A -- REPLACE 4WD CONTROL ECU

3. CHECK WIRE HARNESS (DLC3 - ECM AND BODY GROUND)

(a) Turn the ignition switch off.





(b) Disconnect the A9 ECM connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

for 2AR-FE





for 2GR-FE





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. CHECK WIRE HARNESS (DLC3 - BODY GROUND)

(a) Measure the resistance of the DLC3.





Standard resistance:





B -- REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- Continue to next step.

5. CHECK CAN COMMUNICATION SYSTEM

(a) Check if the CAN communication DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A -- REPLACE 4WD CONTROL ECU