Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DLC3

Measure the resistance of the DLC3.

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT CHART

Tester Connection	Condition	Specified Condition	Proceed to
D1-6 (CANH) - D1-14 (CANL)	Ignition switch OFF	108 to 132 Ω	A
D1-6 (CANH) - D1-14 (CANL)	Ignition switch OFF	132 Ω or higher	B

NOTE: 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 " after repairing the trouble area.

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

A: Go to Next step

CHECK CAN MAIN BUS LINE FOR DISCONNECTION (FOR ECM)

Disconnect the J25 CAN junction connector.

Fig 2: Identifying J25 CAN Junction Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
J25-10 (CANH) - J25-21 (CANL)	Ignition switch OFF	108 to 132 Ω

NG: Go to step 4

OK: Go to Next step

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

Disconnect the J25 CAN junction connector.

Fig 3: Identifying J25 CAN Junction Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
J25-11 (CANH) - J25-22 (CANL)	Ignition switch OFF	108 to 132 Ω

NG: Go to step 5

OK: REPAIR OR REPLACE CAN JUNCTION CONNECTOR

CHECK ECM

Disconnect the E6 ECM connector.

Fig 4: Identifying E6 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the ECM.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E6-25 (CANH) - E6-24 (CANL)	Ignition switch OFF	108 to 132 Ω

NG: REPLACE ECM

OK: REPAIR OR REPLACE ECM MAIN BUS LINE AND CONNECTOR

CHECK TRANSLATE ECU

Disconnect the T28 translate ECU connector.

Fig 5: Identifying T28 Translate ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the translate ECU.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
T28-8 (CANH) - T28-10 (CANL)	Ignition switch OFF	108 to 132 Ω

NG: REPLACE TRANSLATE ECU

OK: REPAIR OR REPLACE TRANSLATE ECU MAIN BUS LINE AND CONNECTOR