STOP AND START SYSTEM Neutral Position Switch Circuit

DESCRIPTION

The engine stop and start ECU uses the park/neutral position switch assembly installed to the automatic transaxle assembly to detect when the shift lever is in P or N.

WIRING DIAGRAM

Refer to DTC P1780 Click here

PROCEDURE


  1. READ VALUE USING GTS (NEUTRAL SWITCH)


    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 / Stop and Start / Data List / Neutral Switch.

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

      OK
      GTS Display Measurement Item/Range Normal Condition Diagnostic Note
      Neutral Switch

      Displays the shift position N or P /

      Displays ON or OFF

      • ON: Shift lever is in N or P

      • OFF: Shift lever is in other than N or P

      		 -
      Result
      Result Proceed to
      Data List display is not within standards A
      Data List display is within standards B

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly Click here.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A77 engine stop and start ECU connector.

    2. Disconnect the A36 certification ECU (smart key ECU assembly) connector.

    3. Disconnect the A75 ECM connector.

    4. Disconnect the D72 park/neutral position switch assembly connector.

    5. Remove the ST relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-21 (STA) - D72-9 (L) Always Below 1 Ω
      A77-17 (CLL) - D72-4 (B) Always Below 1 Ω
      A77-21 (STA) - Body ground Always 80 to 180 Ω
      A77-17 (CLL) - Body ground Always 10 kΩ or higher
      D72-9 (L) - Body ground Always 80 to 180 Ω
      D72-4 (B) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR