Toyota Venza: 4WD Control ECU Communication Stop Mode

Toyota Venza Service Manual / Networking / Can Communication System / 4WD Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
4WD Control ECU Communication Stop Mode	"Four Wheel Drive Control" is not displayed on the "CAN Bus Check" screen of the Techstream. Applies to 4WD Control ECU Communication Stop Mode in the DTC Combination Table.	Power source circuit of 4WD control ECU 4WD control ECU branch line or connector 4WD control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
Turn the ignition switch off before inspecting CAN bus wires for a ground short.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.	CHECK OPEN IN CAN BUS WIRE (4WD CONTROL ECU BRANCH LINE)

(a) Turn the ignition switch off.

(b) Disconnect the 4WD control ECU connector.

Text in Illustration

*1	Front view of wire harness connector (to 4WD Control ECU)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
D38-14 (CANH) - D38-16 (CANL)	Ignition switch off	54 to 69 Ω

REPAIR OR REPLACE 4WD CONTROL ECU BRANCH WIRE OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D38-11 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to 4WD Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

3.	CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D38-23 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to 4WD Control ECU)

REPLACE 4WD CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

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