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 the stop and start cancel indicator light blinks.

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 the stop and start cancel indicator light blinks.

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.

  • Ignition switch ON

  • Starter assembly

  • ST/MGC relay

  • ST2 relay

  • Related fuse

Both of the following conditions continue 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.

  • Harness or connector

  • Engine stop and start ECU

  • ST/MGC relay

  • ECM

  • ST2 relay

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 battery terminal has been disconnected, the stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.

    • 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 GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Start the engine and warm it up.

    4. 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.

    5. Stop the vehicle, allow the engine to stop due to stop and start system control (with the shift lever in D).

    6. Release the brake pedal to allow the engine to restart (with the shift lever in D).

    7. 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 stop and start will be prohibited. In this case, drive the vehicle for 15 to 40 minutes to permit the stop and start operation.


    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, allow the engine to stop due to stop and start system control (with the shift lever in D).

    5. Release the brake pedal to allow the engine to restart (with the shift lever in D).

    6. Release the brake pedal and check that the engine restarts.

WIRING DIAGRAM

A005GPCE01
A005GJPE01

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.

  • 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, perform deceleration sensor zero point clear and calibration 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.

PROCEDURE


  1. READ VALUE USING GTS (STARTER OPERATION NUMBER)


    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 A
      Below 368000 B

    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 replacing the starter assembly with a starter operation number exceeding the specified value with a new one, replace the ST/MGC relay, ST2 relay, and the related fuses at the same time because these parts may have deteriorated over time as well.

    2. Reset the starter operation number Click here.


    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.

      Note

      The value may not be displayed correctly on the GTS because of the battery's condition. (a minimum battery voltage to start the engine is 8.5 V or higher)

      OK
      Ignition Switch Position Engine Starter Signal
      ON OFF
      START ON

    NG

    CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST2 RELAY) Click here

    OK

  4. READ VALUE USING GTS (STARTER SIGNAL FOR SFI SYSTEM)


    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.

      Note

      The value may not be displayed correctly on the GTS because of the battery's condition. (a minimum battery voltage to start the engine is 8.5 V or higher)

      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 - ST2 RELAY) Click here

  5. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST2 RELAY)


    1. Disconnect the A58 ECM connector.

    2. Disconnect the A73 engine stop and start ECU connector.

    3. Remove the ST2 relay from engine room relay block.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A73-23 (STA2) - ST2 relay holder 2 Always Below 1 Ω
      A58-22 (STA) - ST2 relay holder 2 Always Below 1 Ω
      A73-23 (STA2) - A58-22 (STA) Always Below 1 Ω
      A73-23 (STA2) - Body ground Always 10 kΩ or higher
      A58-22 (STA) - Body ground Always 10 kΩ or higher
      ST2 relay holder 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT ST2 RELAY


    1. A005GSLE01

      Remove the ST2 relay from the engine room main 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 to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ST2 RELAY

    OK

  7. CHECK HARNESS AND CONNECTOR (ST2 RELAY - BODY GROUND)


    1. Remove the ST2 relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST2 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 - ST2 RELAY)


    1. Disconnect the A58 ECM connector.

    2. Disconnect the A73 engine stop and start ECU connector.

    3. Remove the ST2 relay from engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-22 (STA) - ST2 relay holder 2 Always Below 1 Ω
      A58-22 (STA2) - Body ground Always 10 kΩ or higher
      ST2 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