Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: AWD Warning Remains ON

DESCRIPTION

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

If the 4WD ECU assembly stores any DTCs which are related to the dynamic torque control AWD system, the warning message is displayed on the multi-information display in the combination meter assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND DYNAMIC TORQUE CONTROL AWD SYSTEM)

(a) Check if CAN communication system DTCs are output.

Click here

(b) Check if the dynamic torque control AWD system DTC is output.

Chassis > Four Wheel Drive > Trouble Codes

Result

Proceed to

Neither CAN communication system DTC nor dynamic torque control AWD system DTC is output

A

CAN communication DTC is output

B

Dynamic torque control AWD system DTC is output

C

HINT:

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

B

GO TO CAN COMMUNICATION SYSTEM

C

REPAIR CIRCUIT INDICATED BY OUTPUT CODE

A

2.

CHECK IF 4WD ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) Check if the 4WD ECU assembly connector is securely connected.

OK:

The connector is securely connected.

NG

CONNECT CONNECTOR TO ECU CORRECTLY

OK

3.

INSPECT AUXILIARY BATTERY

(a) Check the auxiliary battery voltage.

Standard voltage:

11 to 14 V

NG

CHECK CHARGING SYSTEM

OK

4.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

(a) Disconnect the 4WD ECU assembly connector.

*a

Front view of wire harness connector

(to 4WD ECU Assembly)

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O201-3 (IG1) - Body ground

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O201-4 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

READ VALUE USING GTS (4WD WARNING LIGHT)

(a) According to the display on the GTS, read the Data List.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

4WD Warning Light

AWD warning (multi-information display)

OFF or ON

OFF: Warning off

ON: Warning on

-

Chassis > Four Wheel Drive > Data List

Tester Display

4WD Warning Light

(b) Check the GTS display condition of the 4WD warning light.

Result

Proceed to

Display of the Data List remains OFF

A

Display of the Data List remains ON

B

A

GO TO METER / GAUGE SYSTEM

B

REPLACE 4WD ECU ASSEMBLY

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