Active Torque Control 4WD System

MF1A TRANSFER / 4WD / AWD: 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 warning light.
HINT: When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

WIRING DIAGRAM





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

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if the CAN communication DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- INSPECT CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. CHECK WIRE HARNESS (TC OF DLC3 - TC OF ECM AND BODY GROUND)




(a) Turn the ignition switch off.
(b) Disconnect the ECM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard Resistance:






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

3. CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)




(a) Measure the resistance of the DLC3.
Standard Resistance:






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

4. CHECK WIRE HARNESS (TC OF DLC3 - BODY GROUND)




(a) Measure the resistance of the DLC3.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE 4WD CONTROL ECU