STOP AND START SYSTEM, 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 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 ECU 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 ECU 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), park/neutral position switch assembly, airbag ECU 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

  • SFI system

  • Starter assembly

  • Engine stop and start ECU

 Does not come on DTC stored

*1: Only when the shift lever is in D, S or M

*2: The mode "stalled" represents a state in which engine restart is prohibited/canceled due to a collision being detected or the engine hood being opened and restart is not preferable. In this situation, "IG" is displayed for the Data List item [Stop&Start of Eng State]. If the mode changes to "IG", engine start by stop and start control is prohibited and the engine can only be started by operating the push start switch assembly.

*3: Engine stop judgment is performed to judge whether the engine is stopped completely. The engine stop and start ECU judges that the engine is stopped when it does not receive an engine speed signal (NE signal) from the ECM for 0.6 seconds or more.

*4: The engine stop and start ECU stores DTC P0335.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and total number of engine starts 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.

  • 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, airbag sensor assembly*1 or yaw rate and acceleration sensor*2, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here


    • *1: for Optitron Meter Type

    • *2: for TFT Meter Type

  • 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 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 the 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

  • Stop and Start Control Mode Transition:

    B007WT7E04

    • *1: Engine stop conditions are met.

    • *2: Engine stop judgment is determined.

    • *3: Engine start conditions are met before the engine is judged as stopped.

    • *4: Engine start conditions are met.

    • *5: Engine determined to be started (engine speed reaches a specified rpm).

    • *6: Collision detected or engine hood opened and mode changed to "stalled".

    • *7: 0.6 seconds elapse after engine stop judgment is established.

    • *8: Engine is started using the push start switch assembly.

PROCEDURE


  1. CHECK DTC OUTPUT (SFI SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes


      Powertrain > Engine > Trouble Codes

    5. Read the DTCs.

      Result
      Result Proceed to
      SFI system DTCs are not output A
      SFI system starting malfunction circuit DTC is output and starter assembly does not operate
      SFI system starting malfunction circuit DTC is output and starter assembly operates B
      DTCs other than SFI system starting malfunction circuit DTC are output

      Tech Tips


      • According to the display on the GTS, check the freeze frame data item [Cranking Time] in the sets of freeze frame data.

      • If the value of [Cranking Time] is approximately 3 seconds, the stop and start control system or starter system may be malfunctioning.

      • If the value of [Cranking Time] is small (approximately 0.5 seconds or less: the minimum value varies depending on the model), the SFI system may be malfunctioning.

      • The Data List item [Cranking Time] indicates the length of time starter operation is requested by the engine stop and start ECU. If the engine speed exceeds the specified value, the engine stop and start ECU cancels its start request.


    B

    GO TO SFI 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 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 Voltage 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, ST NO. 2 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Data List / Hood Courtesy Switch.

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


      Powertrain > Stop and Start > Data List
      Tester Display
      Hood Courtesy Switch
      OK
      Tester Display Condition Normal Condition
      Hood Courtesy Switch Engine hood closed ON
      Engine hood open OFF
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    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)


    1. Disconnect the A11 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
      A11-1 (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))


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

    2. Disconnect the A11 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) - A11-2 (+) Always Below 1 Ω
      A66-7 (BNT1) - Body ground Always 10 kΩ or higher
      A11-2 (+) - 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 B

      Tech Tips

      When "Engine Stall History during S&S (Collision or Battery Voltage 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 stop and start control was operating.


    A

    END (ENGINE STALLED BECAUSE COLLISION DETECTION SIGNAL WAS RECEIVED)

    B

    GO TO AIRBAG SYSTEM Click here

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


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

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

    3. Disconnect the A74 certification ECU (smart key ECU assembly) connector.

    4. Disconnect the D15 park/neutral position switch assembly connector.

    5. Disconnect the A46 ECM connector.

    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
      A66-23 (STA2) - ST NO. 2 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
      A66-23 (STA2) - Body ground Always 10 kΩ or higher
      ST NO. 2 relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the ST and ST NO. 2 relays from the No. 1 engine room relay block and No. 1 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
      ST NO. 2 relay terminal 1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (ST, ST NO. 2 RELAY - BATTERY)


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

    2. B007Y8CC02
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay Terminal
      *3 ST NO. 2 Relay Terminal

      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
      ST NO. 2 relay terminal 5 - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B007YFPC02
      *1 Starter Assembly
      *a E2-1 (B)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E2-1 (B) - Body ground Always 9.5 to 14 V

      Note

      Before performing this step, check that the starter assembly connector E2 is not disconnected or loose.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (ST, ST NO. 2 RELAY - STARTER ASSEMBLY)


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

    2. Disconnect the D18 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 - D18-2 (SL1) Always Below 1 Ω
      ST NO. 2 relay terminal 3 - D18-1 (SL2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. INSPECT RELAY (ST, ST NO. 2 RELAY)


    1. Inspect the ST relay.

      Click here

    2. Inspect the ST NO. 2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (ST, ST NO. 2 RELAY)

    OK

  14. 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