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STOP AND START SYSTEM, Diagnostic DTC:P1603

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DTC Code DTC Name
P1603 Engine Stall History
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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. DTC Detection Condition Trouble Area
P1603
  • 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 center 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 sensor (neutral position switch), center 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

  • Vehicle stability control system

  • ECD system

  • Starter assembly

  • Engine stop and start ECU

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WIRING DIAGRAM


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INSPECTION PROCEDURE

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 yaw rate sensor, perform deceleration sensor zero point clear and calibration (Click here).

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tip:

  • 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 the 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.

    3. If a collision detection signal is received from the yaw rate sensor while the engine is stopped by stop and start control, the engine will stall.

    4. If a collision detection signal is received from the yaw rate sensor while the engine is restarted by stop and start control, the engine will stall.

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

    6. 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.

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PROCEDURE


  1. Click here

    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.

      Table 1. Result
      Result Proceed to
      No ECD system DTCs are output A
      Starter assembly does not operate
      Starter assembly operates B
      ECD system DTCs are output C

  2. Click here

    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.

    Tip:

    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.

      Table 2. Result
      GTS 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

  3. Click here

    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.

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

      OK
      GTS Display Condition Normal Condition
      Hood Courtesy Switch Normal Condition ON
      Engine hood is open OFF

  4. Click here

    INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)


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


  5. Click here

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


    1. Disconnect the A44 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
      A44-1 (E) - Body ground Always Below 1 Ω

  6. Click here

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


    1. Disconnect the A74 engine stop and start ECU connector.

    2. Disconnect the A44 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
      A74-7 (BNT1) - A44-2 (+) Always Below 1 Ω
      A74-7 (BNT1) - Body ground Always 10 kΩ or higher
      A44-2 (+) - Body ground Always 10 kΩ or higher

  7. Click here

    CHECK VEHICLE CONDITION (COLLISION HISTORY)


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

      Table 3. 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 (Collision or Battery Low)" Yes) C
      Tip:

      • 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.)


  8. Click here

    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

  9. Click here

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


    1. A01IPRYE11

      Disconnect the A73 engine stop and start ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A73-7 (BIN) - Body ground Always 9.5 to 14
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

  10. Click here

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


    1. Disconnect the A73 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
      A73-8 (GND) - Body ground Always Below 1 Ω

  11. Click here

    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

  12. Click here

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


    1. w/ Entry and Start System:

      Disconnect the power management control ECU connector.

    2. Disconnect the A74 engine stop and start ECU connector.

    3. Disconnect the ECM connector.

    4. Disconnect the clutch start switch assembly (for lower) connector.

    5. Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A74-21 (STA) - ST relay terminal 2 Always Below 1 Ω
      A74-21 (STA) - Body ground Always 10 kΩ or higher
      ST relay terminal 2- Body ground Always 10 kΩ or higher

  13. Click here

    CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


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

    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

  14. Click here

    CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY)


    1. A01ITNLE01

      Remove the ST relay from the No. 3 relay block.

    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
      Table 5. Text in Illustration
      *1 No. 3 Relay Block
      *2 ST Relay Terminal

  15. Click here

    CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - BATTERY)

    Note:

    Before performing this step, check that the starter assembly connector D3 is not disconnected or loose.


    1. A01ISMFE01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D3-1 - Body ground Always 9.5 to 14 V
      Table 6. Text in Illustration
      *1 Starter Assembly
      *2 D3-1 Terminal

  16. Click here

    CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)


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

    2. Disconnect the C92 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 - C92-1 Always Below 1 Ω

  17. Click here

    INSPECT RELAY (ST RELAY)


    1. Inspect the ST relay (Click here).


  18. Click here

    INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly (Click here).


  19. Click here

    GO TO ECD SYSTEMClick here

  20. Click here

    GO TO DIAGNOSTIC TROUBLE CODE CHARTClick here

  21. Click here

    USE SIMULATION METHOD TO CHECKClick here

  22. Click here

    REPLACE HOOD LOCK ASSEMBLYClick here

  23. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. Click here

    REPLACE ENGINE STOP AND START ECUClick here

  25. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  26. Click here

    END (ENGINE STALLED BECAUSE COLLISION DETECTION SIGNAL WAS RECEIVED)

  27. Click here

    GO TO AIRBAG SYSTEMClick here

  28. Click here

    GO TO CHARGING SYSTEMClick here

  29. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  30. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  31. Click here

    REPLACE ENGINE STOP AND START ECUClick here

  32. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  33. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  34. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  35. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  36. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  37. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  38. Click here

    REPLACE RELAY (ST RELAY)

  39. Click here

    REPLACE ENGINE STOP AND START ECUClick here

  40. Click here

    REPLACE STARTER ASSEMBLYClick here