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Home >> Toyota >> 2012 >> Prius V >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System [Diagnostic Codes (P0069-273 - P0A78-113)] >> Hybrid Control System >> DTC P0851-579: Park / Neutral Switch Input Circuit Low; DTC P0852-580: Park / Neutral Switch Input Circuit High >> Procedure

DTC P0851-579: Park / Neutral Switch Input Circuit Low; DTC P0852-580: Park / Neutral Switch Input Circuit High: Procedure

  1. INSPECT P POSITION SWITCH 
    1. Disconnect connector L124 from the P position switch (transmission shift main switch).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 1: Checking P Position Switch
      GTY331857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      L124-4 (S) - L124-2 (E) Switch pressed 680 Ω
      L124-4 (S) - L124-2 (E) Switch released 4580 Ω
      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 

  2. CHECK HARNESS AND CONNECTOR (+B SHORT) 
    1. Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room relay block and junction block assembly.
      Fig 2: Identifying IGCT No. 2 Fuse And AM2 Fuse & Engine Room Relay Block And Junction Block Assembly
      GTY339526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 AM2 Fuse
      *3 IGCT NO. 2 Fuse
    2. Disconnect connector L124 from the P position switch (transmission shift main switch).
    3. Measure the resistance according to the value(s) in the table below.
      Fig 3: Measuring Resistance Of P Position Switch
      GTY324205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      L5-16 (P1) - A21-2 (+B2) Power switch off 1.4 to 1.6 kΩ
      L5-16 (P1) - A22-5 (+B1) Power switch off 1.4 to 1.6 kΩ
      L5-16 (P1) - L5-1 (AM22) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-7 (AM21) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-6 (MREL) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-1 (IG2) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-1 (ACCD) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-2 (IG1D) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-2 (IG2D) Power switch off 10 kΩ or higher
      L5-16 (P1) - L5-14 (SPDI) Power switch off 10 kΩ or higher
      L5-16 (P1) - A21-16 (GI) Power switch off 10 kΩ or higher
      L5-16 (P1) - A21-4 (FCTL) Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)
    4. Connect the P position switch (transmission shift main switch) connector.
    5. Install the IGCT NO. 2 fuse and AM2 fuse.

    NG → See step   5 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - P POSITION SWITCH) 
    1. Disconnect connector L5 from the power management control ECU.
    2. Disconnect connector L124 from the P position switch (transmission shift main switch).
    3. Measure the resistance according to the value(s) in the table below.
      Fig 4: Checking Harness And Connector (Power Management Control ECU - P Position Switch)
      GTY329778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      L5-16 (P1) - L124-4 (S) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      L5-16 (P1) or L124-4 (S) - Body ground and other terminals Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
      *b Front view of wire harness connector
      (to P Position Switch (Transmission Shift Main Switch))

      HINT: 

      As necessary, check that there is no short to power supply wires when performing the above wire harness inspection.

    4. Connect the P position switch (transmission shift main switch) connector.
    5. Connect the power management control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (P POSITION SWITCH - BODY GROUND) 
    1. Disconnect connector L124 from the P position switch (transmission shift main switch).
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: Checking Harness And Connector (P Position Switch - Body Ground)
      GTY343032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      L124-2 (E) - Body ground Power switch off Below 1 Ω
      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 → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  5. CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES) 
    1. Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room relay block and junction block assembly.
      Fig 6: Identifying IGCT No. 2 Fuse And AM2 Fuse & Engine Room Relay Block And Junction Block Assembly
      GTY339526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 AM2 Fuse
      *3 IGCT NO. 2 Fuse
    2. Disconnect connector L124 from the P position switch (transmission shift main switch).
    3. Disconnect all the connectors from the power management control ECU.
    4. Measure the resistance according to the value(s) in the table below.
      Fig 7: Measuring Resistance Of P Position Switch
      GTY343935Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      L5-16 (P1) - A21-2 (+B2) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-5 (+B1) Power switch off 10 kΩ or higher
      L5-16 (P1) - L5-1 (AM22) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-7 (AM21) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-6 (MREL) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-1 (IG2) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-1 (ACCD) Power switch off 10 kΩ or higher
      L5-16 (P1) - L6-2 (IG1D) Power switch off 10 kΩ or higher
      L5-16 (P1) - A22-2 (IG2D) Power switch off 10 kΩ or higher
      L5-16 (P1) - L5-14 (SPDI) Power switch off 10 kΩ or higher
      L5-16 (P1) - A21-16 (GI) Power switch off 10 kΩ or higher
      L5-16 (P1) - A21-4 (FCTL) Power switch off 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Power Management Control ECU)
    5. Connect the power management control ECU connectors.
    6. Connect the P position switch (transmission shift main switch) connector.
    7. Install the IGCT NO. 2 fuse and AM2 fuse.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  6. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS 
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