Lexus IS250 · Service Manual BODY ELECTRICAL

B2415

Diagnostic trouble codes

DESCRIPTION

The AFS ECU receives signals regarding the front wheel speed from the skid control ECU.
DTC No.
 DTC Condition Condition
 Trouble Area
B2415
  1. Malfunction in skid control ECU
  2. Open or short in vehicle speed sensor circuit
  1. Skid control ECU with actuator
  2. Wire harness or connector
  3. AFS ECU

WIRING DIAGRAM

E125684E02

INSPECTION PROCEDURE


1. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

  1. Check that no DTC for vehicle stability control system (Click here).

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



B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A


2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU WITH ACTUATOR)

  1. E106822E08
    Disconnect the A14 skid control ECU with actuator connector.

  1. Disconnect the A28 AFS ECU connector.

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

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    A14-37 (FRO) - A28-7 (SPDR)
    		 Always
    		 Below 1 Ω
    A14-38 (FLO) - A28-6 (SPDL)
    		 Always
    		 Below 1 Ω
    A28-7 (SPDR) - Body ground
    		 Always
    		 10 kΩ or higher
    A28-6 (SPDL) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK AFS ECU

  1. E123881E01
    Disconnect the A28 AFS ECU connector.

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Voltage
    A28-6 (SPDL) - Body ground
    		 Vehicle is driving at approx. 30 km/h (19 mph)
    		 0 to 5 V
    Pulse generation (see waveform 1)
    A28-7 (SPDR) - Body ground
    		 Vehicle is driving at approx. 30 km/h (19 mph)
    		 0 to 5 V
    Pulse generation (see waveform 1)

    1. I030993E01
      Waveform 1: Oscilloscope wave
      Item
      		 Contents
      Tool setting
      		 2 V/DIV., 2 ms./DIV.
      Vehicle condition
      		 Vehicle is driving at approximately 30 km/h (19 mph)

      OK:
      Waveform is output as shown in the illustration.


      Result:
      Result
      		 Proceed to
      OK (When checking from DIAGNOSTICS TROUBLE CODE CHART)
      		 A
      OK (When checking from PROBLEM SYMPTOMS TABLE)
      		 B
      NG
      		 B



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE BRAKE ACTUATOR ASSEMBLY
A

REPLACE AFS ECU


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