DTC P0851-775: Park / Neutral Switch Input Circuit Low: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / EV / Trouble Codes.
4. Check if DTCs related to the EV control system are output.

   Result

   Result	Proceed to
   Only P0851-775 is output.	A
   P0705-757 is also output.	B

5. Turn the power switch off.

B → See step   7 

A: Go to next step 

1. Turn the power switch on (IG).
2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Measuring Voltage Of Power Management Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A22-23 (N) - Body ground	Power switch on (IG) N position	11 to 14 V
   A22-23 (N) - Body ground	Power switch on (IG) Except N position	1.2 to 2.8 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

3. Turn the power switch off.

NG → See step   4 

OK: Go to next step 

Refer to CHECK FOR INTERMITTENT PROBLEMS

OK → See step   6 

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Disconnect the shift lever position sensor connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Measuring Resistance Of Shift Lever Position Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   B5-7 (+B) - B5-2 (N)	N position	Below 1 Ω
   B5-7 (+B) - B5-2 (N)	Except N position	4.2 to 5.2 kΩ

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Shift Lever Position Sensor)

3. Reconnect the shift lever position sensor connector.

NG → See step   8 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

NEXT → See step   9