Toyota 4Runner: Open in CAN Main Wire

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / Open in CAN Main Wire

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

Symptom	Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.	CAN main wire and connector No. 1 junction connector* No. 2 junction connector No. 3 junction connector No. 4 junction connector ECM Combination meter assembly DLC3 branch wire or connector

*: for 4WD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 (NO. 2 JUNCTION CONNECTOR - DLC3)

(a) Disconnect the F59 No. 2 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F59-4 (CANH) - F13-6 (CANH)	Ignition switch off	Below 1 Ω
F59-15 (CANL) - F13-14 (CANL)	Ignition switch off	Below 1 Ω

Text in Illustration

Rear view of wire harness connector

(to No. 2 Junction Connector)

Front view of DLC3

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

3.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F59-3 (CANH) - F59-14 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 2 Junction Connector)

Result

Result	Proceed to
OK	A
NG (for 2WD)	B
NG (for 4WD)	C

GO TO STEP 5

GO TO STEP 7

4.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F59-1 (CANH) - F59-12 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 2 Junction Connector)

REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR

GO TO STEP 12

5.	CONNECT CONNECTOR

(a) Reconnect the F59 No. 2 junction connector connector.

6.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)

(a) Disconnect the F14 combination meter assembly connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F14-1 (CANH) - F14-2 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Front view of wire harness connector (to Combination Meter Assembly)

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)

7.	CONNECT CONNECTOR

(a) Reconnect the F59 No. 2 junction connector connector.

8.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

(a) Disconnect the A36 No. 1 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A36-3 (CANH) - A36-6 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 1 Junction Connector)

GO TO STEP 10

9.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A36-2 (CANH) - A36-5 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 1 Junction Connector)

REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

10.	CONNECT CONNECTOR

(a) Reconnect the A36 No. 1 junction connector connector.

11.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ASSEMBLY - NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the F14 combination meter assembly connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F14-1 (CANH) - F14-2 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Front view of wire harness connector (to Combination Meter Assembly)

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER ASSEMBLY - NO. 1 JUNCTION CONNECTOR)

12.	CONNECT CONNECTOR

(a) Reconnect the F59 No. 2 junction connector connector.

13.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - ECM)

(a) Disconnect the G13 No. 4 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
G13-5 (CANH) - G13-16 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 4 Junction Connector)

GO TO STEP 15

14.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
G13-6 (CANH) - G13-17 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 4 Junction Connector)

REPAIR OR REPLACE NO. 4 JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

15.	CONNECT CONNECTOR

(a) Reconnect the G13 No. 4 junction connector connector.

16.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the F60 No. 3 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F60-2 (CANH) - F60-13 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 3 Junction Connector)

GO TO STEP 18

17.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F60-1 (CANH) - F60-12 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 3 Junction Connector)

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

18.	CONNECT CONNECTOR

(a) Reconnect the F60 No. 3 junction connector connector.

19.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the F50 ECM connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F50-32 (CANH) - F50-31 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 3 JUNCTION CONNECTOR)

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