Toyota 4Runner: 4WD Control ECU Communication Stop Mode

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / 4WD Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
4WD Control ECU Communication Stop Mode	Either condition is met: "Four Wheel Drive Control" is not displayed on the "Bus Check" screen. "4WD Control ECU Communication Stop Mode" in "DTC Combination Table" applies.	Power source circuit of four wheel drive control ECU Four wheel drive control ECU branch line or connector Four wheel drive control ECU

HINT:

For vehicles with four wheel drive only.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1.	DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).

2.	CHECK FOR OPEN IN CAN BUS WIRE (FOUR WHEEL DRIVE CONTROL ECU BRANCH WIRE)

(a) Disconnect the F47 four wheel drive control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F47-19 (CANH) - F47-20 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

*a	Rear view of wire harness connector (to Four Wheel Drive Control ECU)

REPAIR OR REPLACE FOUR WHEEL DRIVE CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

3.	CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ).

(b) Disconnect the F46 four wheel drive control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F46-4 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F46-3 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Rear view of wire harness connector (to Four Wheel Drive Control ECU)

Result

Result	Proceed to
OK (for VF2A)	A
OK (for VF4BM)	B
OK (for VF2BM)	C
NG	D

REPLACE NO. 2 FOUR WHEEL DRIVE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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