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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 360 (Abs With BA & EBD System - Diagnostics) >> Circuit Inspection >> DTC Always On Malfunction In Abs Ecu >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check Skid Control ECU Connector Securely Connected 
    1. OK: Go To Next Step  .
    2. NG: Connect Connectors 
  2. Check DTC Once More (See  PRE-CHECK  ) 
    Fig 1: Reviewing DTC Malfunction Information
    G01113344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. A : Go To Next Step  .
    2. B : Repair Circuit Indicated By Output Code 
  3. Check Voltage Of ECU IG Power Source 

    In Case Of Using The TOYOTA Hand-Held Tester: 

    1. Select the DATALIST mode on the TOYOTA hand-held tester.
    2. Check the voltage condition output from the ECU displayed on the TOYOTA hand-held tester.
      Fig 2: Checking ECU IG Power Source Voltage
      G01113345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. OK: "Normal" Is Displayed. 

    In Case Of Not Using The TOYOTA Hand-Held Tester: 

    1. Remove the skid control ECU with connectors still connected.
    2. Turn the ignition switch ON, measure voltage between terminals IG1 and GND of skid control ECU connector.
      1. OK: Voltage: 10-14 V 
    1. OK: Check And Repair Harness And Connector 
    2. NG: Go To Next Step  .
  4. Inspect Battery (Terminal Voltage) 
    1. Check the battery positive voltage.
      1. OK: Voltage: 10-14 V 
    1. NG: Check And Replace Charging System 
    2. OK: Go To Next Step  .
  5. Check Wire Harness And Connector (Battery - Skid Control ECU).  See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS .
    1. NG: Check And Repair Harness And Connector 
    2. OK: Go To Next Step  .
  6. Check ABS Warning Light 

    In Case Of Using The TOYOTA Hand-Held Tester: 

    1. Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
    2. Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the TOYOTA hand-held tester.

    In Case Of Not Using The TOYOTA Hand-Held Tester: 

    1. Turn the ignition switch OFF.
    2. Disconnect the connector from the skid control ECU.
    3. Turn the ignition switch ON.
    4. Check the ABS warning light goes off.
    1. OK: Check And Replace Skid Control ECU Assy. 
    2. NG: Check And Replace Combination Meter Assy. 
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