DTC P0850-12: Park/Neutral Switch Circuit Short to Battery; DTC P0850-14: Park/Neutral Switch Circuit Short to Ground or Open [10/2022 - ]: Procedure

1. Enter the following menus: Powertrain / Transmission / Data List / Shift SW Status (P, R, N, D Range).
2. In accordance with the display on the GTS, read the Data List.

   Powertrain > Transmission > Data List 

   Tester Display
   Shift SW Status (P Range)
   Shift SW Status (R Range)
   Shift SW Status (N Range)
   Shift SW Status (D Range)

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition
   Shift SW Status (P Range)	Park/Neutral position switch assembly status	OFF or ON	OFF: Shift lever not in P ON: Shift lever in P
   Shift SW Status (R Range)	Park/Neutral position switch assembly status	OFF or ON	OFF: Shift lever not in R ON: Shift lever in R
   Shift SW Status (N Range)	Park/Neutral position switch assembly status	OFF or ON	OFF: Shift lever not in N ON: Shift lever in N
   Shift SW Status (D Range)	Park/Neutral position switch assembly status	OFF or ON	OFF: Shift lever not in D ON: Shift lever in D

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. Enter the following menus: Powertrain / Engine / Data List / Neutral Position SW.

   Powertrain > Engine > Data List 

   Tester Display
   Neutral Position SW

2. In accordance with the display on the GTS, read the Data List.

   Powertrain > Engine > Data List 

   Tester Display	Measurement Item	Range	Normal Condition
   Neutral Position SW	Park/neutral position switch assembly status	OFF or ON	OFF: Shift lever not in P or N ON: Shift lever in P or N

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

See step  3

1. Inspect the park/neutral position switch assembly.

   Refer to INSPECTION [10/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  4

1. Disconnect the engine stop and start ECU connector.
2. Disconnect the park/neutral position switch assembly connector.
3. Disconnect the ECM connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A34-21 (STA) - C52-9 (L)	Always	Below 1 Ω
   A34-17 (CLL) - C52-4 (B)	Always	Below 1 Ω
   A34-21 (STA) - Body ground	Always	80 to 180 Ω
   A34-17 (CLL) - Body ground	Always	10 kΩ or higher
   C52-9 (L) - Body ground	Always	80 to 180 Ω
   C52-4 (B) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Inspect the park/neutral position switch assembly.

   Refer to INSPECTION [10/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  6

1. Disconnect the ECM connectors.
2. Disconnect the park/neutral position switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A83-42 (P) - C52-3 (PL)	Always	Below 1 Ω
   A83-41 (R) - C52-2 (RL)	Always	Below 1 Ω
   A83-40 (N) - C52-8 (NL)	Always	Below 1 Ω
   A83-39 (D) - C52-7 (DL)	Always	Below 1 Ω
   A83-15 (NSW) - C52-4 (B)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR