STOP AND START SYSTEM, Diagnostic DTC:P085012, P085014

DTC Code DTC Name
P085012 Park/Neutral Switch Circuit Short to Battery
P085014 Park/Neutral Switch Circuit Short to Ground or Open

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 blinks the stop and start cancel indicator, prohibits stop and start control and stores DTC P085012 or P085014.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory 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):


  • Engine switch on (IG)

  • NSW signal is off with the shift lever in P or N.

  • Wire harness or connector

  • Park/Neutral position switch assembly

  • ECM

  • Engine stop and start ECU

 Blinks DTC stored 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):


  • Engine switch on (IG)

  • NSW signal is on with the shift lever not in P or N.

  • Wire harness or connector

  • Park/Neutral position switch assembly

  • ECM

  • Engine stop and start ECU

 Blinks DTC stored SAE Code: P0851

WIRING DIAGRAM

B0057JBE02

CAUTION / NOTICE / HINT

Note


  • for 8AR-FTS:

    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

  • for 3ZR-FAE:

    When replacing the engine stop and start ECU with a new one, make sure to download the previous status (number of starter operations) of the old engine stop and start ECU. After replacing the engine stop and start ECU, turn the engine switch on (IG) and wait 20 seconds, then confirm that "OK" is displayed for the Data List item "Stop&Start Operating Permission (Discharged Oil Pump Air)". Then upload the previous status (number of starter operations) to the engine stop and start ECU.

    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

  • After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

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

    Click here

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

Tech Tips


  • 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

  • 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.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (SHIFT SW STATUS)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. for 8AR-FTS:

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


      Powertrain > Engine > Data List
      Tester Display
      Shift SW Status (P Range)
      Shift SW Status (R Range)
      Shift SW Status (N Range)
      Shift SW Status (D Range)

      for 3ZR-FAE:

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Shift SW Status (P Range)
      Shift SW Status (R Range)
      Shift SW Status (N Range)
      Shift SW Status (D Range)

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

      for 8AR-FTS:


      Powertrain > Engine > 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 M

      ON: Shift lever in D or M

      for 3ZR-FAE:


      Powertrain > Engine and ECT > 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 M

      ON: Shift lever in D or M
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS (NEUTRAL POSITION SW OR NEUTRAL POSITION SW SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. for 8AR-FTS:

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


      Powertrain > Engine > Data List
      Tester Display
      Neutral Position SW

      for 3ZR-FAE:

      Enter the following menus: Powertrain / Engine and ECT / Data List / Neutral Position SW Signal.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Neutral Position SW Signal

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

      for 8AR-FTS:


      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

      for 3ZR-FAE:


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition
      Neutral Position SW Signal 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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for U661E: Click here for U661F: Click here for K114: Click here for K114F: Click here

    OK

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


    1. Disconnect the engine stop and start ECU connector.

    2. Disconnect the park/neutral position switch assembly connector.

    3. Disconnect the ECM connector.

    4. Disconnect the certification ECU (smart key ECU Assembly) connector.

    5. Remove the ST relay from No. 1 engine room relay block and junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-21 (STA) - C14-9 (L) Always Below 1 Ω
      A38-17 (CLL) - C14-4 (B) Always Below 1 Ω
      A38-21 (STA) or C14-9 (L) - Body ground and other terminals Always 10 kΩ or higher
      A38-17 (CLL) or C14-4 (B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for U661E: Click here for U661F: Click here for K114: Click here for K114F: Click here

    OK

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


    1. Disconnect the ECM connector.

    2. Disconnect the park/neutral position switch assembly connector.

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

      Standard Resistance
      for 8AR-FTS:
      Tester Connection Condition Specified Condition
      C20-64 (P) - C14-3 (PL) Always Below 1 Ω
      C20-35 (R) - C14-2 (RL) Always Below 1 Ω
      C20-65 (N) - C14-8 (NL) Always Below 1 Ω
      C20-34 (D) - C14-7 (DL) Always Below 1 Ω
      A35-57 (NSW) - C14-4 (B) Always Below 1 Ω
      for 3ZR-FAE:
      Tester Connection Condition Specified Condition
      C65-70 (P) - C14-3 (PL) Always Below 1 Ω
      C65-64 (R) - C14-2 (RL) Always Below 1 Ω
      C65-69 (N) - C14-8 (NL) Always Below 1 Ω
      C65-65 (D) - C14-7 (DL) Always Below 1 Ω
      A35-23 (NSW) - C14-4 (B) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 8AR-FTS: Click here for 3ZR-FAE: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR