STOP AND START SYSTEM, Diagnostic DTC:P1545

DTC Code DTC Name
P1545 Starter Maintenance

DESCRIPTION

If the number of starter operations exceeds a specified limit, Stop and Start system control will be prohibited. This DTC will be stored and the ECO indicator light will start blinking to inform the driver that control has been prohibited.

The STA signal (starter signal) is directly detected by the engine stop and start ECU and also detected by the ECM and sent to the engine stop and start ECU.

If above two signals do not match, this DTC will be stored.

DTC No. DTC Detection Condition Trouble Area
P1545

The following condition is met (1 trip detection logic):


  • The number of starter operations exceeds the specified limit.

 Starter assembly
P1545

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


  • Normal communication with the ECM.

  • STA signals detected by the ECM and the engine stop and start ECU do not match.

  • Harness or connector

  • Engine stop and start ECU

  • ST relay

  • ECM

Tech Tips

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.


  1. After troubleshooting, perform the following steps to recheck for DTCs and check if the Stop and Start system operates normally.

    Tech Tips


    • If the ECM learned values have been cleared by disconnecting the battery or for another reason, Stop and Start system control will be prohibited until ECM learning completes.

    • Allow the engine to idle for 3 minutes after the engine warms up and check that the engine speed is within 50 rpm of the target idle speed.


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Start the engine and warm it up.

    4. Drive the vehicle at 20 km/h (12.4 mph) or more and stop the vehicle to allow the engine to stop due to Stop and Start system control.

    5. Depress the clutch pedal to allow the engine to restart.

    6. Check that no DTCs are output Click here.

  2. Check if the Stop and Start system operates normally.

    Tech Tips

    If the battery terminal has been disconnected, the ECO OFF indicator will be illuminated. In this case, drive the vehicle for 15 to 40 minutes to turn off the indicator.


    1. Warm up the engine.

    2. Turn the air conditioning system off.

    3. Drive the vehicle at 7 km/h (4.3 mph) or more.

    4. Stop the vehicle. Move the shift lever to neutral and release the clutch pedal.

    5. Check that the engine stops.

    6. Depress the clutch pedal and check that the engine restarts.

WIRING DIAGRAM

A0119KDE01
A01192JE01

INSPECTION PROCEDURE

Note


  • If the engine stop and start ECU is being replaced, register the previously recorded number of starter operations into the new engine stop and start ECU Click here.

  • After the starter assembly is replaced, be sure to clear the number of starter operations stored in the engine stop and start ECU Click here.

  • After the engine stop and start ECU is replaced or after an air conditioner kit is installed, clear the A/C information stored in the engine stop and start ECU Click here.

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (STARTER OPERATION NUMBER)


    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 / Starter Operation #.

    5. Read the Starter Operation # value displayed on the intelligent tester.

      Result
      Result Proceed to
      368000 or more A
      Below 368000 B

    B

    READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL FOR SFI SYSTEM) Click here

    A

  2. REPLACE STARTER ASSEMBLY


    1. Replace the starter assembly Click here.

    2. Reset the starter operation number Click here.


    NEXT

    END

  3. READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL FOR SFI SYSTEM)


    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 / Starter Signal.

    5. Depress the clutch pedal fully.

    6. Read the value displayed on the intelligent tester when the ignition switch is turned to the ON and START positions.

      OK
      Ignition Switch Position Starter Signal
      ON OFF
      START ON
      Result
      Result Proceed to
      OK A
      NG (w/o Entry and Start System) B
      NG (w/ Entry and Start System) C

    B

    REPAIR OR REPLACE STARTER SIGNAL CIRCUIT (STARTER SIGNAL CIRCUIT FOR SFI SYSTEM) Click here

    C

    REPAIR OR REPLACE STARTER SIGNAL CIRCUIT (CRANKING HOLDING FUNCTION CIRCUIT FOR SFI SYSTEM) Click here

    A

  4. INSPECT ENGINE STOP AND START ECU (STA TERMINAL VOLTAGE)


    1. A011AX8E02
      Text in Illustration
      *1

      Component with harness connected:

      (Engine Stop and Start ECU)

      Turn the ignition switch to ON.

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

      Tech Tips

      If battery voltage drops below 8 V when cranking, CAN communication may be interrupted.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D79-1 (STA) - Body ground Ignition switch ON 0 to 1.5 V
      D79-1 (STA) - Body ground Cranking 6 to 14 V

    NG

    INSPECT ST RELAY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  5. INSPECT ST RELAY


    1. A0119F1

      Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST relay.


    NG

    REPLACE ST RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ENGINE ROOM RELAY BLOCK)


    1. Disconnect engine stop and start ECU connector.

    2. Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D79-1 (STA) - ST relay terminal 2 Always Below 1 Ω
      D79-1 (STA) - Body ground Always 10 kΩ or higher
      ST relay terminal 2- Body ground Always 10 kΩ or higher

    4. Reconnect the engine stop and start ECU connector.

    5. Reinstall the ST relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - CLUTCH START SWITCH)


    1. Disconnect engine stop and start ECU connector.

    2. Disconnect the clutch start switch (lower) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D79-1 (STA) - A29-1 Always Below 1 Ω
      D79-1 (STA) - Body ground Always 10 kΩ or higher
      A29-1 - Body ground Always 10 kΩ or higher

    4. Reconnect the engine stop and start ECU connector and clutch start switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM)


    1. Disconnect engine stop and start ECU connector.

    2. Disconnect ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D79-1 (STA) - A18-48 (STA) Always Below 1 Ω
      D79-1 (STA) - Body ground Always 10 kΩ or higher
      A18-48 (STA) - Body ground Always 10 kΩ or higher

    4. Reconnect the engine stop and start ECU connector and ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ENGINE STOP AND START ECU Click here