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Home >> Toyota >> 2003 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 770 (Automatic Transmission Electronic Controlled (ECT) - A750E & A750F (2UZ-FE) - Diagnostics) >> DTC P2740, P2742, P2743: Transmission Fluid Temperature Sensor "B" Circuit Low/High Input >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

According to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
  1. Warm up the engine.
  2. Turn the ignition switch off.
  3. Connect the hand-held tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.
  4. Turn the ignition switch to the ON position.
  5. Turn on the tester.
  6. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST".
  7. According to the display on the tester, read the "DATA LIST".
    Fig 1: Diagnostic Item Chart
    G02584972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

When DTC P2742 is output and OBD II scan tool or hand-held tester output is 150°C (302°F) or more, there is a short circuit.

When DTC P2743 is output and OBD II scan tool or hand-held tester output is -40°C (-40°F), there is an open circuit.

Measure the resistance between terminal THO2 (OT2) and body ground.

TEMPERATURE MALFUNCTION CHART

Temperature Displayed Malfunction
-40°C (-40°F) Open circuit
150°C (302°F) or more Short circuit
  1. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) 
    1. Disconnect the transmission wire connector from the transmission.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      1 (OT2-) - 9 (OT2+) 25 Ω to 156 kΩ
      1 (OT2-) - Body ground 10 kΩ or higher
      9 (OT2+) - Body ground 10 kΩ or higher

    HINT:

    If the resistance is out of the specified range with either the ATF temperature shown in the table below, the driveability of the vehicle may decrease.

    ATF TEMPERATURE SPECIFIED CONDITION

    ATF Temperature Specified Condition
    20°C (68°F) 3 to 4 kΩ
    110°C (230°F) 0.22 to 0.28 kΩ
    Fig 2: Connecting Transmission Wire Connector To Transmission
    G02584973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE  TRANSMISSION WIRE (A750E/A750F) 
    2. OK: GO TO NEXT STEP. 
  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) 
    1. Connect the transmission wire connector to the transmission.
    2. Disconnect the ECM connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      E5 - 32 (THO2) - E4 - 28 (E2) 25 Ω to 156 kΩ
    4. Measure the resistance according to the value(s) in the table below.

    Standard (Check for short): 

    Fig 3: Measuring Resistance And Resistance Specification
    G02584974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Measuring Resistance At ECM Terminals
    G02584975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    2. OK: GO TO NEXT STEP. 

    REPLACE  ECM (2UZ-FE) 

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