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Home >> Lexus >> 2012 >> CT 200h Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Electronic A/T Shift Lever System (Diagnostic Codes & Circuit Tests) >> Electronic Shift Lever System >> Circuit Tests >> "P" Position Switch Indicator Light Circuit >> Procedure

"P" Position Switch Indicator Light Circuit: Procedure

  1. CHECK P POSITION SWITCH (INDICATOR LIGHT) 
    1. Turn the power switch on (IG).
    2. Depress the brake pedal and move the shift lever to select neutral (N).
    3. Inspect the indicator light condition by operating the P position switch (transmission shift main switch).

      Result

      Condition of Indicator Light Proceed to
      Indicator light does not go off. (Remains on) A
      Indicator light does not come on. B
    4. Turn the power switch off.

    B → See step   4 

    A: Go to next step 

  2. CHECK P POSITION SWITCH (INDICATOR LIGHT) 
    1. Disconnect connector A21 from the transmission control ECU assembly.
    2. Turn the power switch on (IG).
    3. Inspect the indicator light condition by operating the P position switch (transmission shift main switch).

      Result

      Condition of Indicator Light Proceed to
      Indicator light does not go off. (Remains on) A
      Indicator light goes off. B
      NOTE:

      Turning the power switch on (IG) with the transmission control ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    4. Turn the power switch off.
    5. Connect the transmission control ECU assembly connector.

    B → See step   7 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - P POSITION SWITCH) 
    1. Disconnect connector A21 from the transmission control ECU assembly.
    2. Disconnect connector H81 from the P position switch (transmission shift main switch).
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying A21 And H81 Connector Terminals
      GTY352934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      A21-20 (IND) or H81-7 (IND-) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Transmission Control ECU Assembly)
      *b Front view of wire harness connector
      (to P Position Switch (Transmission Shift Main Switch))
    4. Connect the P position switch (transmission shift main switch) connector.
    5. Connect the transmission control ECU assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE P POSITION SWITCH 

  4. CHECK HARNESS AND CONNECTOR (P POSITION SWITCH POWER SOURCE CIRCUIT) 
    1. Disconnect the connector from the P position switch (transmission shift main switch).
    2. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying H81 Connector Terminals
      GTY349856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      H81-6 (IND+) - Body ground Power switch off 9 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to P Position Switch (Transmission Shift Main Switch))
    3. Connect the P position switch (transmission shift main switch) connector.

    NG → CHECK AND REPAIR POWER SOURCE CIRCUIT 

    OK: Go to next step 

  5. INSPECT P POSITION SWITCH 
    1. Disconnect the connector from the P position switch (transmission shift main switch).
    2. Apply auxiliary battery voltage between terminals H81-6 (IND+) and H81-7 (IND-) and check the indicator light.
      Fig 3: Identifying H81 Connector Terminals
      GTY347774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Condition Specified Condition
      Auxiliary battery voltage applied between terminals H81-6 (IND+) and H81-7 (IND-) Comes on
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (P Position Switch (Transmission Shift Main Switch))

      HINT: 

      Terminals No. 1 and No. 8 on the component side connector are empty.

    3. Connect the P position switch (transmission shift main switch) connector.

    NG → REPLACE P POSITION SWITCH 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU - P POSITION SWITCH) 
    1. Disconnect connector A21 from the transmission control ECU assembly.
    2. Disconnect the connector from the P position switch (transmission shift main switch).
    3. Measure the resistance according to the value(s) in the table below.
      Fig 4: Identifying A21 And H81 Connector Terminals
      GTY352935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      A21-20 (IND) - H81-7 (IND-) Power switch off Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Transmission Control ECU Assembly)
      *b Front view of wire harness connector
      (to P Position Switch (Transmission Shift Main Switch))
    4. Connect the P position switch (transmission shift main switch) connector.
    5. Connect the transmission control ECU assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  7. REPLACE TRANSMISSION CONTROL ECU ASSEMBLY. Refer to  COMPONENTS 
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