Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION SYSTEM AND MULTIPLEX COMMUNICATION SYSTEM

Check it a DTC of CAN communication system and multiplex communication system is output.

Result

RESULT REFERENCE

Condition	Proceed to
DTC is not output.	A
DTC is output (Multiplex communication system).	B
DTC is output (CAN communication system).	C

B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (See DIAGNOSTIC TROUBLE CODE CHART )

C: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step

CHECK HARNESS AND CONNECTOR (ECM - DLC3)

Disconnect ECM A6 connector

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
A6-21 (TC) - J21-13 (TC)	Always	Below 1 Ω
J21-13 (TC) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT DLC3 TERMINAL VOLTAGE

Turn the engine switch on (IG).

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
J21-13 (TC) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying DLC3 Connector Terminals

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NG: REPLACE ECM (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

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

Fig 2: Identifying DLC3 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (See REMOVAL )