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HOMESERVICE MANUALSTOYOTA2009COROLLA S, 1.8 U, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLBRAKE CONTROL/DYNAMIC CONTROL SYSTEMVEHICLE STABILITY CONTROL SYSTEMCHECK FOR INTERMITTENT PROBLEMS
2009 Toyota Corolla S, 1.8 U, Standard

Check For Intermittent Problems

2009 Toyota Corolla S, 1.8 U, StandardSECTION Check For Intermittent Problems
  1. CHECK FOR INTERMITTENT PROBLEMS 

    HINT:

    A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the ECU Data List function of the Techstream.

    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions should be monitored.

      HINT:

      • A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check).
      • If the status remains on (ERROR displayed), check for continuity between the ECU and the sensors, or between ECUs.
      • The ERROR display on the Techstream remains on for 1 second after the harness signal changes from momentary interruptions (open circuit) to normal condition.
      Fig 1: Techstream Display
      G06013803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      ABS/VSC/TRAC 

      ABS/VSC/TRAC REFERENCE CHART

      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      FR Speed Open FR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      FL Speed Open FL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      RR Speed Open RR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      RL Speed Open RL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      EFI Communication Open EFI communication open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      Yaw Rate Open Yaw rate sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      Deceleration Open Acceleration sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
      Steering Open Steering angle sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal -
    6. While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.

      OK: 

      NORMAL display appears. 

      HINT:

      The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connector and/or wire harness as one of them is faulty.

      Fig 2: Checking Connector And Wire Harness Between ECU And Sensors
      G05112215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.