STOP AND START SYSTEM, Diagnostic DTC:P1780

DTC Code DTC Name
P1780 Discrepancy between Neutral Position SW and Shift Position

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 light, prohibits stop and start control and stores DTC P1780.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P1780 Discrepancy between Neutral Position SW and Shift Position

Both of the following conditions are met for 2 seconds or more (2 trip detection logic) (*1):


  • Engine switch on (IG)

  • NSW signal is ON with the shift lever in D

Both of the following conditions are met for 2 seconds or more (2 trip detection logic) (*1):


  • Engine switch on (IG)

  • NSW signal is ON with the shift lever in R

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


  • Engine switch on (IG)

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

  • Park/neutral position switch assembly

  • Engine stop and start ECU

  • ECM

  • Wire harness or connector

 Blinks DTC stored

*1: "ON" is displayed for the freeze frame data item [Neutral Switch Stuck ON]

*2: "ON" is displayed for the freeze frame data item [Neutral Switch Stuck OFF]

WIRING DIAGRAM

B00805GE11

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and total number of engine starts and write it into a new 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, airbag sensor assembly*1 or yaw rate and acceleration sensor*2, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here


    • *1: for Optitron Meter Type

    • *2: for TFT Meter Type

  • 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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Data List.

    5. 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

      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)
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS (NEUTRAL POSITION SW)


    1. Enter the following menus: Powertrain / Transmission / Data List.

    2. 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

      Powertrain > Transmission > Data List
      Tester Display
      Neutral Position SW
      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.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A66 engine stop and start ECU connector.

    2. Disconnect the D15 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
      A66-21 (STA) - D15-9 (L) Always Below 1 Ω
      A66-17 (CLL) - D15-4 (B) Always Below 1 Ω
      A66-21 (STA) - Body ground Always 80 to 180 Ω
      A66-17 (CLL) - Body ground Always 10 kΩ or higher
      D15-9 (L) - Body ground Always 80 to 180 Ω
      D15-4 (B) - Body ground 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.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A46 and D1 ECM connectors.

    2. Disconnect the D15 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
      D1-64 (P) - D15-3 (PL) Always Below 1 Ω
      D1-35 (R) - D15-2 (RL) Always Below 1 Ω
      D1-65 (N) - D15-8 (NL) Always Below 1 Ω
      D1-34 (D) - D15-7 (DL) Always Below 1 Ω
      A46-57 (NSW) - D15-4 (B) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR