Lexus IS250 · Service Manual BRAKE

TC and CG Terminal Circuit

Circuit diagnosis

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS warning light.

WIRING DIAGRAM

C109399E03

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here).


1. CHECK CAN COMMUNICATION SYSTEM

  1. Check if the CAN communication system DTC is output (Click here for LHD, or Click here for RHD).

    Result:
    Condition
    		 Proceed to
    DTC is not output
    		 A
    DTC is output
    		 B



B
INSPECT CAN COMMUNICATION SYSTEM
A


2. INSPECT DLC3

  1. G022986E04
    Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    J21-13 (TC) - J21-4 (CG)
    		 Engine switch on (IG)
    		 10 to 14 V



OK
Go to step 5
NG


3. CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)

  1. C128346E01
    Turn the engine switch off.

  1. Disconnect the ECM connector.

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

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND)

  1. G022986E05
    Measure the resistance according to the value(s) in the table below.

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. CHECK ECM (TC of DLC3 INPUT)

  1. G022986E04
    Reconnect the ECM connector.

  1. Using the SST, connect terminals TC and CG of the DLC3.

  1. Turn the engine switch on (IG).

  1. Check that the engine warning light is blinking.

    Result:
    Condition
    		 Proceed to
    Engine warning light is blinking
    		 A
    Engine warning light is not blinking
    		 B

    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (Click here).



 B
REPAIR OR REPLACE WIRE HARNESS OR ECM (TC of ECM CIRCUIT)
A

REPLACE BRAKE ACTUATOR ASSEMBLY


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