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Home >> Toyota >> 2009 >> Tundra Base, 5.7 W >> Repair and Diagnosis >> External Pages >> Different car >> Section 186 (Networking) >> Can Communication System >> Skid Control ECU Communication Stop Mode >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
  2. CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH WIRE) 
    1. Disconnect the A19 skid control ECU.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      A19-5 (CANH) - A19-4 (CANL) Ignition switch off 54 to 69 Ω

    NG: REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    Fig 1: Identifying A19 Skid Control ECU Connector Terminals
    G05653021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Disconnect the A19 skid control ECU connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A19-1 (GND1) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Switch Condition Specified Condition
      A19-16 (+BM) - Body ground Always 11 to 14 V
      A19-47 (+BS) - Body ground
      A19-9 (IG1) - Body ground Ignition switch ON

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying A19 Skid Control ECU Connector Terminals
    G05653022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY  (See REMOVAL )

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