Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Park/Neutral Switch Circuit Short to Battery (P085012,P085014)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Park/Neutral Switch Circuit Short to Battery (P085012,P085014)

DESCRIPTION

The engine stop and start ECU detects malfunctions by comparing the conditions of the shift position signal and NSW signal.

If a malfunction is detected, the engine stop and start ECU stores DTC P085012 or P085014.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P085012

Park/Neutral Switch Circuit Short to Battery

Both of the following conditions are met for 15 seconds or more (2 trip detection logic):

  • Ignition switch ON.
  • NSW signal is off with the shift lever in P or N.
  • Wire harness or connector
  • Park/Neutral position switch assembly
  • TCM
  • Engine stop and start ECU

Does not come on

Does not come on

SAE Code: P0852

P085014

Park/Neutral Switch Circuit Short to Ground or Open

Both of the following conditions are met for 2 seconds or more (2 trip detection logic):

  • Ignition switch ON.
  • NSW signal is on with the shift lever not in P or N.
  • Wire harness or connector
  • Park/Neutral position switch assembly
  • TCM
  • Engine stop and start ECU

Does not come on

Does not come on

SAE Code: P0851

WIRING DIAGRAM

w/ Smart Key System

w/o Smart Key System

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

    Click here

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here

  • When the ECM is replaced on a vehicle with a non-specified auxiliary battery, it is necessary to perform auxiliary battery type switching.

    Click here

  • When the engine stop and start ECU or oil pump with motor assembly is replaced, check the oil pump with motor assembly.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

  • Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

    Click here

  • For wire harness and connector inspection procedures and precautions, refer to
  • DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

PROCEDURE

1.

READ VALUE USING GTS (SHIFT SW STATUS)

(a) Enter the following menus: Powertrain / Transmission / Data List / Shift SW Status (P, R, N, D Range).

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)

(b) In accordance with the display on the GTS, read the Data List.

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 or S

ON: Shift lever in D or S
NG

GO TO STEP 5

OK

2.

READ VALUE USING GTS (NEUTRAL POSITION SW)

(a) Enter the following menus.

Powertrain > Transmission > Data List

Tester Display

Neutral Position SW

(b) In accordance with the display on the GTS, read the Data List.

Powertrain > Transmission > 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
OK

USE SIMULATION METHOD TO CHECK

NG

3.

INSPECT PARK/NEUTRAL POSITION SWITCH
  • for 2WD: Click here
  • for AWD: Click here
NG

REPLACE PARK/NEUTRAL POSITION SWITCH

for 2WD: Click here

for AWD: Click here

OK

4.

CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Disconnect the A169 engine stop and start ECU connector.

(b) Disconnect the C62 park/neutral position switch assembly connector.

(c) Disconnect the A47 ECM connector.

(d) Disconnect the I223 certification ECU (smart key ECU Assembly) connector.*1

  • *1: w/ Smart Key System

(e) Remove the ST relay from the No. 1 engine room relay block.

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A169-21 (STA) - C62-5 (L)

Always

Below 1 Ω

A169-17 (CLL) - C62-4 (B)

Always

Below 1 Ω

A169-21 (STA) - Body ground and other terminals

Always

10 kΩ or higher

C62-5 (L) - Body ground and other terminals

Always

10 kΩ or higher

A169-17 (CLL) - Body ground and other terminals

Always

10 kΩ or higher

C62-4 (B) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ENGINE STOP AND START ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT PARK/NEUTRAL POSITION SWITCH

for 2WD: Click here

for AWD: Click here

NG

REPLACE PARK/NEUTRAL POSITION SWITCH

for 2WD: Click here

for AWD: Click here

OK

6.

CHECK HARNESS AND CONNECTOR (ECM AND TCM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Disconnect the C80 TCM connector.

(b) Disconnect the A47 ECM connector.

(c) Disconnect the C62 park/neutral position switch assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C80-29 (P) - C62-6 (PL)

Always

Below 1 Ω

C80 30 (R) - C62-1 (RL)

Always

Below 1 Ω

C80-32 (N) - C62-9 (NL)

Always

Below 1 Ω

C80-31 (D) - C62-7 (DL)

Always

Below 1 Ω

A47-23 (NSW) - C62-4 (B)

Always

Below 1 Ω
OK

REPLACE TCM

for 2WD: Click here

for AWD: Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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