From 08/2009

MF1A TRANSFER / 4WD / AWD: ACTIVE TORQUE CONTROL 4WD SYSTEM: Warning Light Circuit
- Warning Light Circuit

DESCRIPTION

The 4WD control ECU is connected to the combination meter via the CAN communication system.

If the 4WD control ECU stores any DTCs which are related to the active torque control 4WD system, the AWD warning light comes on in the combination meter.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK FOR DTC

(a) Check if the CAN communication system DTC is output Diagnosis System.

(b) Check if the 4WD control system DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

C -- REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (ACTIVE TORQUE CONTROL 4WD SYSTEM) Active Torque Control 4WD System

B -- REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM) CAN Communication System
A -- Continue to next step.

2. CHECK IF 4WD ECU CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU connector is securely connected.

OK:

The connector is securely connected.

NG -- CONNECT CONNECTOR TO ECU CORRECTLY
OK -- Continue to next step.

3. CHECK BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.

4. PERFORM ACTIVE TEST (4WD WARNING LIGHT)

(a) Warm up the engine.

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / 4WD / Active Test.

(g) According to the display on the Techstream, perform the Active Test.

Chassis / 4WD / Active Test





OK:

The warning light turns off.

NG -- CHECK WIRE HARNESS OR CONNECTOR (4WD ECU - BATTERY)

OK -- REPLACE 4WD ECU ASSEMBLY

1. CHECK WIRE HARNESS OR CONNECTOR (4WD ECU - BATTERY)

(a) Disconnect the ECU connector.





(b) Turn the engine switch on (IG).

(c) Measure the voltage of the wire harness side connector.

Standard Voltage:





Text in Illustration





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

2. CHECK WIRE HARNESS OR CONNECTOR (4WD ECU - BODY GROUND)

(a) Disconnect the ECU connector.





(b) Measure the resistance of the wire harness side connector.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- GO TO METER / GAUGE SYSTEM Problem Symptoms Table