STOP AND START SYSTEM(for 1AD-FTV), Diagnostic DTC:P1603

DTC Code DTC Name
P1603 Engine Stall History

DESCRIPTION

If the engine stalls or fails to start while stop and start control is operating, DTC P1603 will be stored. Using the GTS, the freeze frame data recorded the moment the DTC is stored can be read. Serviceability has been enhanced by enabling the cause of an engine stall or engine start failure which occurred while the stop and start control was operating to be checked using the freeze frame data.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
P1603 Engine Stall History

    Both of the following conditions are met for 0.5 seconds or more (1 trip detection logic):

  • Engine stopped by stop and start control and engine hood opened*1

  • Engine hood courtesy switch (hood lock assembly): Engine hood opened and mode changed to "stalled"*2


    Both of the following conditions are met for 0.5 seconds or more (1 trip detection logic):

  • Engine stopped by stop and start control and collision or low battery voltage detected

  • Collision detection signal received from the airbag sensor assembly and mode changed to "stalled"*2


    Both of the following conditions are met for 0.5 seconds or more (1 trip detection logic):

  • Engine being restarted by stop and start control and collision detected

  • Collision detection signal received from the airbag sensor assembly and mode changed to "stalled"*2


    Both of the following conditions are met for 0.5 seconds or more (1 trip detection logic):

  • Engine being restarted by stop and start control and restart fails

  • Using the NE signal, complete combustion is identified 0.6 seconds after the engine stop judgment*3 was made or complete combustion does not occur even after the starter assembly has operated for a certain amount of time (NE signal is normal).


    Both of the following conditions are met for 0.5 seconds or more (1 trip detection logic):

  • Engine being restarted by stop and start control and restart fails

  • Engine speed signal from the ECM not received via CAN communication (NE signal is abnormal*4)

Detection Conditions: Always

Sensors/components used for detection: engine hood courtesy switch (hood lock assembly), neutral position switch, airbag sensor assembly, battery, crank position sensor, STA signal circuit, ECM

  • Wire harness or connector

  • Engine hood courtesy switch (Hood lock assembly)

  • CAN communication system

  • Airbag system

  • ECD system

  • Starter assembly

  • Engine stop and start ECU

 Does not come on DTC stored

WIRING DIAGRAM


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 procedure.

Tech Tips


  • If other DTCs are output, perform troubleshooting for this DTC first.

  • Unlike other DTCs that are stored due to a malfunction in parts, circuits or systems, DTC P1603 allows determination of a malfunctioning part according to problem symptoms and the freeze frame data related to a problem recognized by the customer. As this DTC may be stored due to an operation by the customer, it is not necessary to service the vehicle unless the customer recognized a problem. Clear DTCs and return the vehicle to the customer.

  • 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

  • Causes of engine stall or engine start failure while the engine is stopped by stop and start control:


    1. If engine hood is opened while the engine is stopped by stop and start control, the engine will stall.

      The number of engine stalls due to the engine hood being opened while the engine is stopped by stop and start control is stored in the engine stall history.


      1. If the engine hood is opened with the clutch pedal fully depressed while the engine is stopped by stop and start control, the engine will restart without stalling.

    2. If a collision detection signal is received from the airbag sensor assembly while the engine is stopped by stop and start control, the engine will stall.

    3. If a collision detection signal is received from the airbag sensor assembly while the engine is restarted by stop and start control, the engine will stall.

    4. If low battery voltage is detected while the engine is stopped by stop and start control, the engine will stall.

    5. If any problems that cause engine start failure and are not indicated by DTCs occur while the engine is stopped by stop and start control, the engine will not start.

PROCEDURE


  1. CHECK DTC OUTPUT (ECD 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 / Trouble Codes

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      No ECD system DTCs are output A
      ECD system DTC 1604 is output and starter assembly does not operate
      ECD system DTC 1604 is output and starter assembly operates B
      DTCs other than ECD system DTC 1604 are output C

    B

    GO TO ECD SYSTEM (DTC P1604) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART (ECD SYSTEM) Click here

    A

  2. CHECK FREEZE FRAME DATA

    Note

    The freeze frame data is cleared when DTCs are cleared. Be sure to make a note of necessary data in advance.

    Tech Tips

    Using the time-series freeze frame data, confirm the freeze frame data recorded the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.


    1. According to the prompts on the GTS screen, read the time-series freeze frame data to confirm the vehicle conditions when an engine stall occurred while the stop and start control was operating.

      Click here

    2. Check the freeze frame data for engine stall history and engine start failure.

      Result
      Tester Display Result Proceed to
      Engine Stall History during S&S (Hood Open) Yes A
      Engine Stall History during S&S (Collision or Battery Low) Yes B
      Engine Stall History during Engine Starting (Collision) Yes
      Engine Start Fail Yes C

    B

    CHECK VEHICLE CONDITION (COLLISION HISTORY) Click here

    C

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

    A

  3. READ VALUE USING GTS (HOOD COURTESY SWITCH)

    Note

    Before performing this step, check that the engine hood can be opened by pulling the hood lock control cable.


    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 / Hood Courtesy Switch.


      Powertrain > Stop and Start > Data List
      Tester Display
      Hood Courtesy Switch

    5. Read the value displayed on the GTS when the engine hood is opened and closed.

      OK
      Tester Display Condition Normal Condition
      Hood Courtesy Switch Engine hood is closed ON
      Engine hood is open OFF
      Result
      Proceed to
      NG
      OK

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  4. INSPECT HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

    Result
    Proceed to
    OK
    NG

    1. Inspect the engine hood courtesy switch (hood lock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) - BODY GROUND)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the A50 engine hood courtesy switch (hood lock assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY))

    Result
    Proceed to
    OK
    NG

    1. Disconnect the A66 engine stop and start ECU connector.

    2. Disconnect the A50 engine hood courtesy switch (hood lock assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A66-7 (BNT1) - A50-1 (+) Always Below 1 Ω
      A66-7 (BNT1) - Body ground Always 10 kΩ or higher
      A50-1 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK VEHICLE CONDITION (COLLISION HISTORY)


    1. Check if the vehicle was in a collision when the engine stalled.

      Result
      Result Proceed to
      Vehicle was in collision when engine stalled A
      Vehicle was not in collision when engine stalled (Freeze Frame Data "Engine Stall History during Engine Starting (Collision)" Yes) B
      Vehicle was not in collision when engine stalled (Freeze Frame Data "Engine Stall History during S&S (Collision or Battery Low)" Yes) C

      Tech Tips


      • When "Engine Stall History during S&S (Collision or Battery Low)" or "Engine Stall History during Engine Starting (Collision)" is stored:

        This may have been stored because the vehicle was in a collision or a collision detection signal was input while the stop and start control was operating.

      • When "Engine Stall History during S&S (Collision or Battery Low)" is detected:

        This may have been stored because the battery was discharged and the voltage dropped while the stop and start control was operating. (e.g.: The gear was changed to any of the drive gears without the clutch pedal being depressed while the engine was stopped by stop and start control and the vehicle was left as is.)


    A

    END (ENGINE STALLED BECAUSE COLLISION DETECTION SIGNAL WAS RECEIVED)

    B

    GO TO AIRBAG SYSTEM w/o Occupant Classification System: Click here
    GO TO AIRBAG SYSTEM w/ Occupant Classification System: Click here

    C

  8. CHECK BATTERY VOLTAGE


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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Positive (+) battery terminal - Negative (-) battery terminal Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CHARGING SYSTEM Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BATTERY)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the A65 engine stop and start ECU connector.

    2. A01QOEHC11
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A65-7 (BIN) - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the A65 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A65-8 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (NEGATIVE (-) BATTERY TERMINAL - BODY GROUND)


    1. Disconnect the negative (-) battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Negative (-) battery terminal - 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

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

    Result
    Proceed to
    OK
    NG

    1. w/ Entry and Start System:

      Disconnect the G82 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A66 engine stop and start ECU connector.

    3. Disconnect the A61 ECM connector.

    4. Disconnect the A4*1 or F2*2 clutch start switch assembly (for lower) connector.


      • *1: for LHD

      • *2: for RHD

    5. Remove the ST relay from No. 2 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
      A66-21 (STA) - ST relay terminal 2 Always Below 1 Ω
      A66-21 (STA) - Body ground Always 10 kΩ or higher
      ST relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY)


    1. A01KD0PC01
      *1 No. 2 Engine Room Relay Block and Junction Block Assembly
      *2 ST Relay Terminal

      Remove the ST relay from No. 2 engine room relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST relay terminal 5 - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - BATTERY)


    1. A01KD7DC01
      *1 Starter Assembly
      *a C4-1 Terminal

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C4-1 - Body ground Always 9.5 to 14 V

      Note

      Before performing this step, check that the starter assembly connector C4 is not disconnected or loose.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)


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

    2. Disconnect the B6 starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 3 - B6-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. INSPECT RELAY (ST RELAY)


    1. Inspect the ST relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (ST RELAY)

    OK

  18. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE STOP AND START ECU Click here

    NG

    REPLACE STARTER ASSEMBLY Click here