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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 C2194/94 Engine 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 (ENGINE 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
      Engine Speed Engine speed/ min.: 0 rpm max.: 65535 rpm Almost same as actual engine speed Speed indicated on combination meter

      OK: 

      Engine 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 (TACH SIGNAL) 
    1. Disconnect the E60 ECU connector.
    2. Start the engine.
    3. Check the waveform of the ECU connector using an oscilloscope, while idling the engine.

      OK 

      WAVEFORM SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E60-4 (TACH) - E60-9 (GND) Idling Correct waveform is as shown

      Tool Setting 

      TOOL SETTING REFERENCE

      Item Contents
      Tool Setting 5V/DIV., 10ms/DIV.

      HINT:

      The wavelength becomes shorter as the engine speed increases.

      4. Fig 1: Identifying E60 ECU Connector Terminals With Waveform
      G05560280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 3 

    OK: REPLACE TIRE PRESSURE WARNING ECU (See  REMOVAL   ) 

  3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - ECM) 
    1. Disconnect the E60 ECU connector.
    2. Disconnect the A24 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E60-4 (TACH) - A24-15 (TACH) Always Below 1 Ω
      E60-4 (TACH) - Body ground Always 10 kΩ or higher

      Result 

      RESULT CHART

      Result Proceed to
      NG A
      OK (2AZ-FE) B
      OK (2GR-FE) C
      4. Fig 2: Checking Harness And Connector (Tire Pressure Warning ECU - ECM)
      G05560281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B : REPLACE ECM  (See REMOVAL )

    C : REPLACE ECM  (See REMOVAL )

    A : REPAIR OR REPLACE HARNESS OR CONNECTOR 

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