Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Check the condition of each related circuit connector before troubleshooting (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

CHECK CAN COMMUNICATION SYSTEM

Check if the CAN communication DTC is output (See DTC CHECK / CLEAR ).

Result

DTC RESULT REFERENCE

Result	Proceed to
CAN communication system DTC is output	A
CAN communication system DTC is not output	B

B: Go to step 2

A: GO TO CAN COMMUNICATION

CHECK HARNESS AND CONNECTOR (ECM TO DLC3)

Disconnect the ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
J21-13 (TC) - A6-3 (TC)	Below 1 Ω
A6-3 (TC) - Body ground	10 kΩ or higher

Fig 1: Identifying ECM And DLC3 Connector Terminals

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (TC TERMINAL CIRCUIT)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (DLC3 CG CIRCUIT)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
J21-4 (CG) - Body ground	Below 1 Ω

Fig 2: Identifying Terminal CG Of DLC3

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (CG TERMINAL CIRCUIT)

OK: Go to next step

REPAIR OR REPLACE HARNESS OR CONNECTOR (TC TERMINAL CIRCUIT)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
J21-13 (TC) - Body ground	10 kΩ or higher

Fig 3: Identifying Terminal TC Of DLC3

NG: CHECK HARNESS AND CONNECTOR OR CHECK EACH ECU

OK: REPLACE 4WD CONTROL ECU