LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Prius >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Shift Control System - Diagnosis >> P Position Switch Indicator Light Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. CHECK INDICATOR LAMP 
    1. Inspect the indicator light condition by operating the P position switch.

      Result: 

      INDICATOR LIGHT CONDITION

      Condition Proceed to
      Indicator light does not go off. A
      Indicator light does not come on. B

      B: Go to step   c 

      A 

    2. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSY - P POSITION SWITCH) 
      Fig 1: Identifying Transmission Control ECU ASSY T4 Connector Terminal
      G02918350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the T4 connector from the transmission control ECU assy.
      2. Disconnect the M11 connector from the P position switch.
      3. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection (Symbols) Condition Specified condition
      T4-9 (IND) - Body ground Always 10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK 

      REPLACE TRANSMISSION CONTROL ECU ASSY 

    3. INSPECT FUSE 
      Fig 2: IDENTIFYING P CON MAIN Fuse
      G02918351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the P CON MAIN fuse from the engine room R/B and J/B.
      2. Check for continuity of the P CON MAIN fuse.

      Standard: Continuity 

      NG: INSPECT FOR SHORT IN ALL COMPONENTS CONNECTED TO FUSE AND REPAIR OR REPLACE THEM IF NEEDED, AND REPLACE FUSE 

      OK 

    4. INSPECT COMPUTER, TRANSMISSION CONTROL IND TERMINAL) 
      Fig 3: Identifying T4 Connector IND Terminal
      G02918352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the T4 connector from the transmission control ECU assy.
      2. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection (Symbols) Condition Specified condition
      T4-9 (IND) - Body ground Always 9 to 14 V

      OK: REPLACE TRANSMISSION CONTROL ECU ASSY 

      NG 

    5. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL ECU ASSY - P POSITION SWITCH) 
      Fig 4: Identifying M11 Connector IND - Terminal AND T4 Connector IND Terminal
      G02918353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the M11 connector from the P position switch.
      2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection (Symbols) Condition Specified condition
      T4-9 (IND) - M11-6 (IND-) Always Below 1 Ω

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK 

    6. INSPECT P POSITION SWITCH 
      Fig 5: Identifying P Position Switch M11 Connector IND + Terminal
      G02918354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection(Symbols) Condition Specified condition
      M11-5 (IND+) - Body ground Always 9 to 14 V

      OK: REPLACE P POSITION SWITCH 

      NG 

      REPAIR OR REPLACE HARNESS OR CONNECTOR (P POSITION SWITCH - BATTERY) 

scientia non olet · About LEMON Manuals