DTC P0850-11: Park/Neutral Switch Circuit Short to Ground; DTC P0850-15: Park/Neutral Switch Circuit Short to Auxiliary Battery or Open [11/2015 - ]: Procedure

1. Disconnect the F53 P position switch (transmission shift main switch) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   (F53)

   (F53)

   Tester Connection	Condition	Specified Condition
   F53-4 (S) - F53-2 (E)	Switch pressed	646 to 714 Ω
   F53-4 (S) - F53-2 (E)	Switch released	4351 to 4809 Ω

   HINT: 

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

3. Reconnect the F53 P position switch (transmission shift main switch) connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH) 

Result: 

OK 

See step  2

1. Disconnect the F3 hybrid vehicle control ECU connector.
2. Disconnect the F53 P position switch (transmission shift main switch) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance (Check for Open)

   (F3, F53)

   (F3)

   (F53)

   Tester Connection	Condition	Specified Condition
   F3-13 (P1) - F53-4 (S)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   (F3, F53)

   (F3)

   (F53)

   Tester Connection	Condition	Specified Condition
   F3-13 (P1) or F53-4 (S) - Body ground and other terminals	Power switch off	10 kΩ or higher

4. Connect the cable to the negative (-) auxiliary battery terminal.
5. Turn the power switch on (IG).
6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   (F3, F53)

   (F3)

   (F53)

   Tester Connection	Condition	Specified Condition
   F3-13 (P1) or F53-4 (S) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU and P position switch (transmission shift main switch) connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

7. Turn the power switch off.
8. Disconnect the cable from the negative (-) auxiliary battery terminal.
9. Reconnect the F53 P position switch (transmission shift main switch) connector.
10. Reconnect the F3 hybrid vehicle control ECU connector.

    Result

    Proceed to
    OK
    NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the F53 P position switch (transmission shift main switch) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to P Position Switch (Transmission Shift Main Switch))

   Standard Resistance (Check for Open)

   (F53)

   (F53)

   Tester Connection	Condition	Specified Condition
   F53-2 (E) - Body ground	Power switch off	Below 1 Ω

3. Reconnect the F53 P position switch (transmission shift main switch) connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR