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. DTC Detection Condition Trouble Area
P1545

The following conditions are met (1 trip detection logic):


  • The number of starter operations exceeds the specified limit.

  • Ignition switch ON.

  • Starter assembly

  • ST relay

  • ST NO. 2 relay*1

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


  • Normal communication with the ECM.

  • STA signal from the ECM and the STA2 signal from the engine stop and start ECU do not match.*1

  • STA signal from the ECM and the STA signal from the engine stop and start ECU do not match.*2

  • Wire harness or connector

  • Engine stop and start ECU

  • ST relay

  • ST NO. 2 relay*1

  • ECM

CONFIRMATION DRIVING PATTERN

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.

    Tech Tips


    • If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. After connecting the cable, drive the vehicle until refresh charge is completed and stop and start control is permitted (approximately 15 to 40 minutes).

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


    1. for Manual transaxle


      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.

      4. Start the engine and warm it up.

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

        CAUTION:

        When performing the 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.

        Tech Tips

        If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

      9. Check that DTCs are not output Click here.

    2. for CVT


      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.

      4. Start the engine and warm it up.

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

        CAUTION:

        When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      6. Depress the brake pedal and stop the vehicle.

      7. Keep the engine stopped by stop and start control for 1 second or more. (Keep the shift lever in D.)

      8. Release the brake pedal with the shift lever in D to start the engine.

        Tech Tips

        If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

      9. Check that DTCs are not output Click here.

  2. Check if the stop and start system operates normally.

    Tech Tips

    If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. After connecting the cable, drive the vehicle until refresh charge is completed and stop and start control is permitted (approximately 15 to 40 minutes).


    1. for Manual transaxle


      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 the 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.

    2. for CVT


      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 the confirmation driving pattern, obey all speed limits and traffic laws.

      4. Depress the brake pedal and stop the vehicle.

      5. Keep the engine stopped by stop and start control for 1 second or more (Keep the shift lever in D).

      6. Release the brake pedal with the shift lever in D to 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" and "ST NO. 2 relay" must be also replaced. (for CVT)

  • When the starter assembly is replaced, "ST relay" must be also replaced. (for Manual transaxle)

  • 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 inspection 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. Read the Starter Operation # value displayed on the GTS.

      Result
      Result Proceed to

      368000 or more

      (1000000 or more)*

      		 A
      Below 368000 (for CVT) B
      Below 368000 (for Manual Transaxle) C

      Tech Tips

      *: If "Starter Operation #" shown as 1000000 times or more, the engine stop and start ECU has an internal malfunction, so the engine stop and start ECU must be replaced.


    B

    READ VALUE USING GTS (ENGINE STARTER SIGNAL) Click here

    C

    READ VALUE USING GTS (STARTER SIGNAL) Click here

    A

  2. REPLACE STARTER ASSEMBLY


    1. Replace the starter assembly (for 1NR-FE with CVT) Click here.

    2. Replace the starter assembly (for 1NR-FE with Manual Transaxle Click here.

    3. Replace the starter assembly (for 1KR-FE) Click here.

    4. Replace the starter assembly (for 1ND-TV) Click here.

      Note


      • When the starter assembly is replaced, "ST relay" and "ST NO. 2 relay" must be also replaced. (for CVT)

      • When the starter assembly is replaced, "ST relay" must be also replaced. (for Manual transaxle)

      • If "Starter Operation #" shown as 1000000 times or more, the engine stop and start ECU has an internal malfunction, so the engine stop and start ECU must be replaced.

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


    NEXT

    END

  3. READ VALUE USING GTS (ENGINE STARTER SIGNAL)


    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 / Engine Starter Signal.

    5. Read the value displayed on the GTS when the ignition switch is turned to ON and START.

      OK
      Ignition Switch Position Engine Starter Signal
      ON OFF
      START ON

    NG

    CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST NO. 2 RELAY) Click here

    OK

  4. READ VALUE USING GTS (STARTER)


    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 / Engine and ECT / Data List / Starter.

    5. Read the value displayed on the GTS when the ignition switch is turned to ON and START.

      OK
      Ignition Switch Position Starter
      ON OFF
      START ON

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST NO. 2 RELAY) Click here

  5. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST NO. 2 RELAY)


    1. Disconnect the A58 ECM connector.

    2. Disconnect the A92 engine stop and start ECU connector.

    3. Remove the ST NO. 2 relay from No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A92-23 (STA2) - ST NO. 2 relay holder 2 Always Below 1 Ω
      A58-22 (STA) - ST NO. 2 relay holder 2 Always Below 1 Ω
      A92-23 (STA2) - A58-22 (STA) Always Below 1 Ω
      A92-23 (STA2), A58-22 (STA) or ST NO. 2 relay holder 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT ST NO. 2 RELAY


    1. Inspect ST NO. 2 relay Click here.


    NG

    REPLACE ST NO. 2 RELAY

    OK

  7. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - BODY GROUND)


    1. Remove the ST NO. 2 relay from No. 2 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 NO. 2 relay holder 1 - Body ground Always Below 1 Ω

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST NO. 2 RELAY)


    1. Disconnect the A58 ECM connector.

    2. Disconnect the A92 engine stop and start ECU connector.

    3. Remove the ST NO. 2 relay from No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A92-23 (STA2) - ST NO. 2 relay holder 2 Always Below 1 Ω
      A92-23 (STA2), A58-22 (STA) or ST NO. 2 relay holder 2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. READ VALUE USING GTS (STARTER SIGNAL)


    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 / Engine and ECT / Data List / Starter Signal.

    5. Depress the clutch pedal fully.

    6. Read the values displayed on the GTS when the ignition or starter switch assembly is turned to ON and START.

      OK
      Ignition Switch Position Starter
      ON OFF
      START ON

    NG

    GO TO SFI SYSTEM (STARTER SIGNAL CIRCUIT)

    OK

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


    1. 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.

      A01VM7CE02
      Text in Illustration
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A92-21 (STA) - Body ground Ignition switch ON 0 to 1.5 V
      Cranking 6 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  11. INSPECT RELAY (ST RELAY)


    1. Inspect the ST relay (for 1NR-FE) Click here.

    2. Inspect the ST relay (for 1KR-FE) Click here.

    3. Inspect the ST relay (for 1ND-TV) Click here.


    NG

    REPLACE RELAY (ST RELAY)

    OK

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


    1. Disconnect the A90 power management control ECU connector.

    2. Disconnect the A39 clutch start switch assembly connector.

    3. Disconnect the A58 ECM connector. (for 1NR-FE)

    4. Disconnect the A93 ECM connector. (for 1KR-FE)

    5. Disconnect the A108 ECM connector. (for 1ND-TV)

    6. Disconnect the A92 engine stop and start ECU connector.

    7. Remove the ST relay from engine room relay block.

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

      Standard Resistance
      for 1NR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - ST relay holder 2 Always Below 1 Ω
      A92-21 (STA), A58-22 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1KR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - ST relay holder 2 Always Below 1 Ω
      A92-21 (STA), A93-46 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1ND-TV
      Tester Connection Condition Specified Condition
      A92-21 (STA) - ST relay holder 2 Always Below 1 Ω
      A92-21 (STA), A108-53 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A90 power management control ECU connector.

    2. Disconnect the A58 ECM connector. (for 1NR-FE)

    3. Disconnect the A93 ECM connector. (for 1KR-FE)

    4. Disconnect the A108 ECM connector. (for 1ND-TV)

    5. Remove the ST relay from engine room relay block.

    6. Disconnect the A92 engine stop and start ECU connector.

    7. Disconnect the A39 clutch start switch assembly connector.

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

      Standard Resistance
      for 1NR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A39-1 Always Below 1 Ω
      A92-21 (STA), A58-22 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1KR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A39-1 Always Below 1 Ω
      A92-21 (STA), A93-46 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1ND-TV
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A39-1 Always Below 1 Ω
      A92-21 (STA), A108-53 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A90 power management control ECU connector.

    2. Disconnect the A39 clutch start switch assembly connector.

    3. Remove the ST relay from engine room relay block.

    4. Disconnect the A92 engine stop and start ECU connector.

    5. Disconnect the A58 ECM connector. (for 1NR-FE)

    6. Disconnect the A93 ECM connector. (for 1KR-FE)

    7. Disconnect the A108 ECM connector. (for 1ND-TV)

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

      Standard Resistance
      for 1NR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A58-22 (STA) Always Below 1 Ω
      A92-21 (STA), A58-22 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1KR-FE
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A93-46 (STA) Always Below 1 Ω
      A92-21 (STA), A93-46 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher
      for 1ND-TV
      Tester Connection Condition Specified Condition
      A92-21 (STA) - A108-53 (STA) Always Below 1 Ω
      A92-21 (STA), A108-53 (STA), A39-1 or ST relay holder 2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR