STOP AND START SYSTEM, Diagnostic DTC:P1545

DTC Code DTC Name
P1545 Starter Maintenance

DESCRIPTION

When the number of starter operations reaches the maximum number, the engine stop and start ECU stores DTC P1545 and blinks the stop and start cancel indicator light. When the STA signal detected by the ECM and by the engine stop and start ECU do not match, the engine stop and start ECU stores DTC P1545 and blinks the stop and start cancel indicator light.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P1545 Starter Maintenance

Both of the following conditions are met (1 trip detection logic):


  • The number of starter operations reaches the specified limit.

  • Ignition switch is turned to ON

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


  • Normal communication with the ECM.

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

  • Wire harness or connector

  • ST relay

  • Engine stop and start ECU

  • Starter assembly

  • ECM

 Blinks DTC stored

CONFIRMATION DRIVING PATTERN

Tech Tips

DTCs for the stop and start system are not cleared automatically even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

Click here


  1. Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

    CONFIRMATION AFTER TROUBLESHOOTING


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Click here


      Powertrain > Stop and Start > Clear DTCs

    4. Start the engine and warm it up.

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

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    6. Stop the vehicle, move the shift lever to neutral and release the clutch pedal.

    7. Keep the engine stopped by stop and start control for 1 second or more.

    8. Depress the clutch pedal and start the engine.

    9. Check that no DTCs are output.

      Click here


      Powertrain > Stop and Start > Trouble Codes

  2. STOP AND START SYSTEM OPERATION CHECK

    Tech Tips


    • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

      In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery temperature at 11°C (51°F) or higher, the refresh charge will be completed.)

    • If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

      If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

    • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.


    1. Start the engine and warm it up.

    2. Turn the air conditioning system off.

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

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

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

    5. Allow the engine to stop by stop and start control.

    6. Depress the clutch pedal and start the engine.

WIRING DIAGRAM

Refer to DTC P0617.

Click here

CAUTION / NOTICE / HINT

Note


  • 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

  • After replacing the starter assembly, perform initialization of the number of starter operations stored in the engine stop and start ECU.

    Click here

  • When the starter assembly is replaced, "ST relay" must be also replaced.

  • 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

  • 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

PROCEDURE


  1. READ VALUE USING GTS (STARTER OPERATION #)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Data List / Starter Operation #.

    5. According to the display on the GTS, read the Data List.


      Powertrain > Stop and Start > Data List
      Tester Display
      Starter Operation #
      Result
      Result Proceed to

      384000 or more

      Displays 1000000 or more*

      		 A
      Below 384000 B

      Tech Tips

      *: If "Starter Operation #" displays 1000000 or more, it is necessary to replace the engine stop and start ECU as there is an internal malfunction in the ECU.


    B

    READ VALUE USING GTS (ENGINE STARTER SIGNAL) Click here

    A

  2. REPLACE STARTER ASSEMBLY


    1. Replace the starter assembly

      Click here

      Tech Tips


      • When the starter assembly is replaced, "ST relay" must be also replaced.

      • If "Starter Operation #" displays 1000000 or more, the engine stop and start ECU must also be replaced.

        Click here

      • Clear the number of starter operations by performing "Starter Exchange" using the GTS.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

    END

  3. READ VALUE USING GTS (ENGINE STARTER SIGNAL)


    1. Enter the following menus: Powertrain / Stop and Start / Data List / Engine Starter Signal.

    2. Read the values displayed on the GTS when the ignition switch is ON and START.


      Powertrain > Stop and Start > Data List
      Tester Display
      Engine Starter Signal
      OK
      Tester Display Switch Condition Normal Condition
      Engine Starter Signal Ignition switch ON OFF
      Ignition switch START ON
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST RELAY) Click here

    OK

  4. READ VALUE USING GTS (STARTER SIGNAL)


    1. Enter the following menus: Powertrain / Engine / Data List / Starter SW.


      Powertrain > Engine > Data List
      Tester Display
      Starter SW

    2. Depress the clutch pedal fully.

    3. According to the display on the GTS, read the Data List.

      OK
      Tester Display Switch Condition Normal Condition
      Starter SW Ignition switch ON OFF

    4. According to the display on the GTS, read the Data List while the vehicle is being driven with an engine speed of 1000 rpm or more at a vehicle speed of 20 km/h (12 mph) or more.

      OK
      Tester Display Condition Normal Condition
      Starter SW Driving at 20 km/h (12.43 mph) or more (engine speed 1000 rpm or more) ON
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (ECM - ST RELAY)


    1. Disconnect the A62 engine stop and start ECU connector.

    2. Disconnect the A38 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-29 (STA) - ST relay holder 2 Always Below 1 Ω
      A38-29 (STA) - Body ground and other terminals Always 10 kΩ or higher
      ST relay holder 2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST RELAY)


    1. Disconnect the A62 engine stop and start ECU connector.

    2. Disconnect the A38 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A62-21 (STA) - ST relay holder 2 Always Below 1 Ω
      A38-29 (STA) - ST relay holder 2 Always Below 1 Ω
      A62-21 (STA)- A38-29 (STA) Always Below 1 Ω
      A62-21 (STA) - Body ground and other terminals Always 10 kΩ or higher
      A38-29 (STA) - Body ground and other terminals Always 10 kΩ or higher
      ST relay holder 2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT ST RELAY


    1. Inspect the ST relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


    1. Remove the ST relay from 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
      ST relay holder 1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR