Lexus IS250 · Service Manual COMMUNICATION SYSTEM

Skid Control ECU Communication Stop Mode

Circuit diagnosis

DESCRIPTION

Detection Item
 Symptom
 Trouble Area
Skid Control ECU Communication Stop Mode
  1. ABS/VSC/TRC is not displayed on the "Communication Bus Check" screen of the intelligent tester
  1. Applies to "Skid Control ECU Communication Stop Mode" in the "DTC COMBINATION TABLE"
  1. Power source circuit of the skid control ECU
  1. Skid control ECU branch line or connector
  1. Skid control ECU

HINT:
"ABS/VSC/TRC" refers to the circuit that includes the skid control ECU.


WIRING DIAGRAM

C126147E04

INSPECTION PROCEDURE


1. CHECK CAN BUS LINE FOR OPEN (SKID CONTROL ECU BRANCH LINE)

  1. Turn the engine switch off.

  1. Disconnect the skid control ECU connector (A14).

  1. E069126E35
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Value
    A14-11 (CANH) - A14-25 (CANL)
    		 Engine switch on (IG)
    		 54 to 69 Ω



NG
REPAIR OR REPLACE SKID CONTROL ECU BRANCH LINE OR CONNECTOR (CAN-H, CAN-L)
OK


2. CHECK WIRE HARNESS (IG1, GND1)

  1. E069126E36
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Value
    A14-32 (GND1) - Body ground
    		Always
    		 Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Value
    A14-46 (IG1) - Body ground
    		 Engine switch on (IG)
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR)


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