AWD Warning Light Remains ON

MF1A TRANSFER / 4WD / AWD: ACTIVE TORQUE CONTROL 4WD SYSTEM: AWD Warning Light Remains ON

AWD Warning Light Remains ON

DESCRIPTION

The AWD control ECU is connected to the combination meter via the CAN communication system.
If the AWD 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 active torque control 4WD 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)
B -- REPAIR CIRCUIT INDICATOR BY OUTPUT CODE (CAN COMMUNICATION SYSTEM)
A -- Continue to next step.

2. CHECK IF AWD CONTROL 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
Result:





C -- INSPECT CHARGING SYSTEM (1AR-FE)
B -- INSPECT CHARGING SYSTEM (2GR-FE)
A -- Continue to next step.

4. PERFORM ACTIVE TEST (AWD WARNING LIGHT)
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(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 AWD warning light turns off.

NG -- CHECK WIRE HARNESS OR CONNECTOR (AWD CONTROL ECU - BATTERY)
OK -- REPLACE AWD CONTROL ECU
5. CHECK WIRE HARNESS OR CONNECTOR (AWD CONTROL ECU - BATTERY)




(a) Disconnect the ECU connector.
(b) Turn the ignition switch to ON.
(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.

6. CHECK WIRE HARNESS OR CONNECTOR (AWD CONTROL 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