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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 268 (Abs - Diagnostics) >> Diagnostic Tests >> Diagnostic Trouble Codes Abs Warning Light Always On - Malfunction In Skid Control Ecu >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Is DTC Output  ?

    Check DTC, see steps 1)  e or  f.

    1. YES  : Repair circuit indicated by the output code.
    2. NO  , go to step  2.
  2. Check That The Skid Control ECU Connector Are Securely Connected To The Skid Control ECU. 
    1. NG  : Connect the connector to the skid control ECU.
    2. OK  : Go to next step.
  3. Check Voltage Between Terminals IG1 And GND Of Skid Control ECU Connector. 

    Preparation  : Disconnect the skid control ECU connector.

    Check  :

    1. Turn the ignition switch ON.
    2. Measure voltage between terminals IG1 (44) and GND (15, 46) of skid control ECU harness side connector.

    OK  : Voltage: 10-14 V.

    Fig 1: Locating IG1 (44) & GND (15, 46) Terminals
    G01118834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG  : Check for open and short circuit in harness and connector between ECU-IG fuse and skid control ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
    2. OK  : Go to step  4.
  4. Check battery positive voltage. 

    Check  : The battery positive voltage.

    OK  : Voltage: 10-14 V.

    1. NG  : Check and repair the GENERATORS & REGULATORS .
    2. OK  : Go to step  5.
  5. Check The TC Terminal Circuit  . See TC Terminal Circuit .
    1. NG  : Repair or replace the TC terminal circuit.
    2. OK  : Go to next step.
  6. Check Operation Of The ABS Warning Light. 

    Preparation in case of using the TOYOTA hand-held tester:

    1. Connect the TOYOTA hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
    3. Select the ACTIVE TEST mode on the TOYOTA hand-held tester.

      Check  : That "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the TOYOTA hand-held tester.

    Preparation 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.

      Check  : The ABS warning light goes off.

      NOTE: When replacing the ECU, perform the zero point calibration. See step  6 under PRE-CHECK.
    1. OK  : Check and replace skid control ECU.
    2. NG  : Go to next step.
  7. Check ABS Warning Light. 

    PROBLEM SYMPTOMS .

    1. NG  : Repair or replace bulb or combination meter.
    2. OK  : Check for short circuit in harness and connector between ABS warning light and skid control ECU.
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