Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000000WIM00XX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line; 2007 MY LX470 [08/2006 -        ]

Open in CAN Main Bus Line

DESCRIPTION

There may be an open circuit in the CAN main bus line and/or the DLC3 sub bus line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 67 Ω or higher.

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is 67 Ω or more.
  • CAN main bus line or connector
  • ECM
  • Gateway ECU
  • DLC3 sub bus line or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK DLC3

(a) Measure the resistance of the DLC3.

Standard resistance:

Tester Connection

Condition

Specified Condition

Proceed to

D8-6 (CANH) - D8-14 (CANL)

Ignition switch OFF

108 to 132 Ω

A

D8-6 (CANH) - D8-14 (CANL)

Ignition switch OFF

132 Ω or higher

B

NOTICE:

When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 sub bus line. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING" 2007 MY LX470 [08/2006 -        ]; CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING after repairing the trouble area.

B

REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CANH, CANL)

A

2.

CHECK CAN MAIN BUS LINE FOR DISCONNECTION (FOR ECM)

(a) Disconnect the J31 ECM main bus line connector from the junction connector B side.

NOTICE:

  • Before disconnecting the connector, make a note of where it is connected.
  • Reconnect the connector to its original position.

(b) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Condition

Specified Condition

J31-1 (CANH) - J31-2 (CANL)

Ignition switch OFF

108 to 132 Ω
NG

GO TO STEP 5

OK

3.

CONNECT CONNECTOR

(a) Reconnect the J31 ECM main bus line connector to the junction connector B side.

NEXT

4.

CHECK CAN MAIN BUS LINE FOR DISCONNECTION (FOR GATEWAY ECU)

(a) Disconnect the J32 gateway ECU main bus line connector from the junction connector B side.

NOTICE:

  • Before disconnecting the connector, make a note of where it is connected.
  • Reconnect the connector to its original position.

(b) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Condition

Specified Condition

J32-1 (CANH) - J32-2 (CANL)

Ignition switch OFF

108 to 132 Ω
NG

GO TO STEP 7

OK

REPLACE JUNCTION CONNECTOR

5.

CONNECT CONNECTOR

Reconnect the J32 ECM main bus line connector to the junction connector B side.

NEXT

6.

CHECK ECM

(a) Disconnect the E9 ECM connector.

(b) Measure the resistance of the ECM connector.

Standard resistance:

Tester Connection

Condition

Specified Condition

E9-33 (CANH) - E9-34 (CANL)

Ignition switch OFF

108 to 132 Ω
NG

REPLACE ECM

OK

REPAIR OR REPLACE ECM MAIN BUS LINE AND CONNECTOR

7.

CONNECT CONNECTOR

(a) Reconnect the J32 gateway ECU main bus line connector to the junction connector B side.

NEXT

8.

CHECK GATEWAY ECU

(a) Disconnect the G5 gateway ECU connector.

(b) Measure the resistance of the gateway ECU connector.

Standard resistance:

Tester Connection

Condition

Specified Condition

G5-17 (CA1H) - G5-18 (CA1L)

Ignition switch OFF

108 to 132 Ω
NG

REPLACE GATEWAY ECU

OK

REPAIR OR REPLACE GATEWAY ECU MAIN BUS LINE AND CONNECTOR