STOP AND START SYSTEM, Diagnostic DTC:P1780

DTC Code DTC Name
P1780 Park / Neutral Position Switch Malfunction

DESCRIPTION

The engine stop and start ECU detects a malfunction by comparing the shift position signal with the park/neutral position switch input state. When a malfunction occurs, the engine stop and start ECU stores P1780, blinks the stop and start cancel indicator light, and stops the stop and start system control.

DTC No. Freeze Frame Data *1 DTC Detection Condition Trouble Area
P1780*2 Neutral switch malfunction (stuck ON)

Either of the following conditions continues for 4 seconds or more (2 trip detection logic):


  • The neutral start switch signal is on and no starter input exists with the shift lever in D.

  • The neutral start switch signal is on and no starter input exists with the shift lever in R.

  • Park/neutral position switch

  • Engine stop and start ECU

  • ECM

  • Harness or connector
Neutral switch malfunction (stuck OFF)

The following condition continues for 15 seconds or more (2 trip detection logic):


  • The neutral start switch signal is off and no starter output exists with the shift lever in P or N.

  • Park/neutral position switch

  • Engine stop and start ECU

  • ECM

  • Harness or connector
DTC No. DTC Detection Condition Trouble Area
P1780*3

The following condition continues for 1 second or more (1 trip detection logic):


  • Open or short in neutral position switch circuit.

  • Neutral position switch

  • Engine stop and start ECU

  • Harness or connector

WIRING DIAGRAM

A005MA8E03
A005GRQE02
for Manual Transaxle
*a Neutral Position Switch
*b Engine Stop and Start ECU

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK SPECIFICATIONS


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      CVT A
      Manual Transaxle B

    B

    READ VALUE USING INTELLIGENT TESTER (NEUTRAL SWITCH) Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (PARK/NEUTRAL POSITION SWITCH SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

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

      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Shift SW Status (P Range)

      PNP switch status /

      ON or OFF

      ON: Shift lever in P

      OFF: Shift lever not in P

      		 -
      Shift SW Status (R Range)

      PNP switch status /

      ON or OFF

      ON: Shift lever in R

      OFF: Shift lever not in R

      		 -
      Shift SW Status (N Range)

      PNP switch status /

      ON or OFF

      ON: Shift lever in N

      OFF: Shift lever not in N

      		 -
      Shift SW Status (D Range)

      PNP switch status /

      ON or OFF

      ON: Shift lever in D or M

      OFF: Shift lever not in D or M

      		 -
      Result
      Result Proceed to
      Data display is within Normal Condition range A
      Data display is not within Normal Condition range B

    B

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER (NEUTRAL POSITION SWITCH SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

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

      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Neutral Position SW Signal

      PNP switch status /

      ON or OFF

      ON: Shift lever in P or N

      OFF: Shift lever not in P or N

      		 -
      Result
      Result Proceed to
      Data display is not within Normal Condition range A
      Data display is within Normal Condition range B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A005L6GE62
      Text In Illustration
      *a

      Component without harness connected

      (Park/Neutral Position Switch Assembly)

      Disconnect the B69 park/neutral position switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      • 1 (RB) - 3 (PL)

      • 4 (B) - 9 (L)

      		 Shift lever in P Below 1 Ω
      1 (RB) - 2 (RL) Shift lever in R Below 1 Ω

      • 1 (RB) - 8 (NL)

      • 4 (B) - 9 (L)

      		 Shift lever in N Below 1 Ω
      1 (RB) - 7 (DL) Shift lever in D or M Below 1 Ω

      • 1 (RB) - 3 (PL)

      • 4 (B) - 9 (L)

      		 Shift lever not in P 10 kΩ or higher
      1 (RB) - 2 (RL) Shift lever not in R 10 kΩ or higher

      • 1 (RB) - 8 (NL)

      • 4 (B) - 9 (L)

      		 Shift lever not in N 10 kΩ or higher
      1 (RB) - 7 (DL) Shift lever not in D or M 10 kΩ or higher

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A53 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-4 (STA) - B69-9 (L) Always Below 1 Ω
      A53-6 (CLL) - B69-4 (B) Always Below 1 Ω
      A53-4 (STA) - Body ground Always 80 to 180Ω
      A53-6 (CLL) - Body ground Always 10 kΩ or higher
      B69-9 (L) - Body ground Always 80 to 180Ω
      B69-4 (B) - Body ground Always 10 kΩ or higher

    3. Reconnect the A53 engine stop and start ECU connector.

    4. Reconnect the B69 park/neutral position switch connector.


    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Disconnect the B69 park/neutral position switch connector.

    2. A005L6GE62
      Text In Illustration
      *a

      Component without harness connected

      (Park/Neutral Position Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      • 1 (RB) - 3 (PL)

      • 4 (B) - 9 (L)

      		 Shift lever in P Below 1 Ω
      1 (RB) - 2 (RL) Shift lever in R Below 1 Ω

      • 1 (RB) - 8 (NL)

      • 4 (B) - 9 (L)

      		 Shift lever in N Below 1 Ω
      1 (RB) - 7 (DL) Shift lever in D or M Below 1 Ω

      • 1 (RB) - 3 (PL)

      • 4 (B) - 9 (L)

      		 Shift lever not in P 10 kΩ or higher
      1 (RB) - 2 (RL) Shift lever not in R 10 kΩ or higher

      • 1 (RB) - 8 (NL)

      • 4 (B) - 9 (L)

      		 Shift lever not in N 10 kΩ or higher
      1 (RB) - 7 (DL) Shift lever not in D or M 10 kΩ or higher

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the B22 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B22-99 (P) - B69-3 (PL) Always Below 1 Ω
      B22-79 (R) - B69-2 (RL) Always Below 1 Ω
      B22-97 (N) - B69-8 (NL) Always Below 1 Ω
      B22-81 (D) - B69-7 (DL) Always Below 1 Ω
      B22-63 (NSW) - B69-4 (B) Always Below 1 Ω

    3. Reconnect the B69 park/neutral position switch connector.

    4. Reconnect the B22 ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. READ VALUE USING INTELLIGENT TESTER (NEUTRAL SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Stop and Start / Data List / Neutral Switch.

    5. Read the value when the shift lever is in neutral and any other position.

      OK
      ON is displayed when the shift lever is in neutral.
      OFF is displayed when the shift lever is in any other position.
      Result
      Result Proceed to
      NG A
      OK B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  9. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - NEUTRAL POSITION SWITCH)


    1. Disconnect the B70 neutral position switch connector and the A53 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-28 (TMVC) - B70-1 (W1) Always Below 1 Ω
      A53-29 (TMN) - B70-2 (TMN) Always Below 1 Ω
      A53-30 (TME2) - B70-3 (F+) Always Below 1 Ω
      A53-28 (TMVC) or B70-1 (W1) - Body ground Always 10 kΩ or higher
      A53-29 (TMN) or B70-2 (TMN) - Body ground Always 10 kΩ or higher
      A53-30 (TME2) or B70-3 (F+) - Body ground Always 10 kΩ or higher

    3. Reconnect the B70 neutral position switch connector and the A53 engine stop and start ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK ENGINE STOP AND START ECU (TMN TERMINAL VOLTAGE)


    1. Measure the voltage according to the value(s) in the table below.

      A005LCME01
      Text In Illustration
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      A53-29 (TMN) - A53-30 (TME2) Ignition switch ON, shift lever in neutral 2.7 to 4.3 V
      A53-29 (TMN) - A53-30 (TME2) Ignition switch ON, shift lever in any position other than neutral 0.7 to 1.9V

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPLACE NEUTRAL POSITION SWITCH Click here