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Home >> Toyota >> 2008 >> Camry Base, Automatic >> Repair and Diagnosis >> Suspension >> Wheels & Tire System >> Tire & Wheel (Except Hybrid) >> Tire Pressure Warning System >> DTC C2191/91 Vehicle Speed Signal Error (Test Mode DTC) >> Inspection Procedure

Inspection Procedure

NOTE:
  • When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using Techstream and write them down before removal.
  • It is necessary to perform initialization (See INITIALIZATION  ) after registration (See REGISTRATION  ) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
  1. READ VALUE USING TECHSTREAM (VEHICLE SPEED) 
    1. Turn the ignition switch off.
    2. Connect Techstream to the DLC3.
    3. Turn the ignition switch on (IG) and the tester on.
    4. Enter the following menus:
      1. Select: Chassis / Tire Pressure Monitor / Data List
    5. Check that the values indicated on the tester and on the combination meter are the same.

      Tire Pressure Monitor 

      TIRE PRESSURE MONITOR DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Vehicle speed/ min.: 0 km/h (0 mph) max.: 255 km/h (158 mph) Almost same as actual vehicle speed Speed indicated on combination meter

      OK: 

      Vehicle speed indicated on the tester and on the combination meter are the same. 

    NG: Go to step 2 

    OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

  2. INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL) 
    1. Disconnect the E60 ECU connector.
    2. Jack up the vehicle.
    3. Shift the lever to the neutral position.
    4. Turn the ignition switch on (IG).
    5. Check the waveform of the ECU connector using an oscilloscope, while turning the wheel slowly.

      OK 

      WAVEFORM SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      E60-2 (SPD) - E60-9 (GND) Ignition switch ON Correct waveform is as shown

      Tool Setting 

      TOOL SETTING REFERENCE

      Item Contents
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Vehicle Condition Rotate driving wheel slowly

      HINT:

      The wavelength becomes shorter as the vehicle speed increases.

      6. Fig 1: Identifying E60 Connector Terminals With Waveform
      G05560277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 3 

    OK: REPLACE TIRE PRESSURE WARNING ECU (See  REMOVAL   ) 

  3. CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER) 
    1. Disconnect the E60 ECU connector.
    2. Disconnect the F2 meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E60-2 (SPD) - F2-12 (+S) Always Below 1 Ω
      E60-2 (SPD) - Body ground Always 10 kΩ or higher
      4. Fig 2: Identifying E60 ECU And F2 Meter Connector Terminals
      G05560278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER  (See REMOVAL )

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