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Home >> Toyota >> 2009 >> Highlander Limited, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Warning Systems >> 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 if 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 turn the tester on.
    4. Enter the following menus: 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 

    TESTER DISPLAY REFERENCE

    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 D33 ECU connector.
    2. Start the engine.
    3. Check the waveform of the ECU connector using an oscilloscope while idling the engine.

    OK 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    D33-4 (TACH) - D33-9 (GND) Idling Correct waveform appears 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.

    NG: Go to step 3 

    Fig 1: Identifying D33 Tire Pressure Warning ECU Connector
    G05417599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE TIRE PRESSURE WARNING ECU  (See REMOVAL )

  3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - ECM) 
    1. Disconnect the D33 ECU connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value (s) in the table below.

    Standard resistance 

    2GR-FE 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    D33-4 (TACH) - D36-1 (TACH) Always Below 1 Ω
    D33-4 (TACH) - Body ground Always 10 kΩ or higher

    1AR-FE 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    D33-4 (TACH) - D60-23 (TACH) Always Below 1 Ω
    D33-4 (TACH) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying D33 ECU And ECM Connectors
    G06120488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM  (See FUEL INJECTOR CIRCUIT )

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