STOP AND START SYSTEM(for 2WW), 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 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

Does not come on

DTC stored

  • *1: Driving shift position only

  • *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 ignition or starter switch assembly (w/o Entry and Start System) or push start switch (w/ Entry and Start System).

  • *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 write it into a new engine stop and start ECU (See page TS-26).

    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" 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 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.

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

  • Stop and Start Control Mode Transition:

    A310520E08

    • *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 ignition or starter switch assembly (w/o Entry and Start System) or push start switch assembly (w/ Entry and Start System).

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

      Starter assembly does not operate

      Starter assembly operates

      B

      ECD system DTCs are output

      C
    B

    GO TO ECD SYSTEM

    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.

    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.

      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 - ECM - 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

      Normal Condition

      ON

      Engine hood is open

      OFF

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    NG

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

  4. 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
      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 stop and start control was operating.

    A

    END (ENGINE STALLED BECAUSE COLLISION DETECTION SIGNAL WAS RECEIVED)

    B

    GO TO AIRBAG SYSTEM

    w/o Occupant Classification System:Click here

    w/ Occupant Classification System:Click here

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

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

      Click here

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

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE HOOD LOCK ASSEMBLY

    Click here

    OK

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

    1. Disconnect the A59 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

      A59-1 (E) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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 A59 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) - A59-2 (+)

      Always

      Below 1 Ω

      A66-7 (BNT1) - Body ground

      Always

      10 kΩ or higher

      A59-2 (+) - 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

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

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

    2. Disconnect the A62 ECM connector.

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

    4. 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

      A62-29 (STA) - ST relay terminal 2

      Always

      Below 1 Ω

      A66-21 (STA) - A62-29 (STA)

      Always

      Below 1 Ω

      A66-21 (STA) - Body ground

      Always

      10 kΩ or higher

      A62-29 (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

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

    1. Remove the ST relay from the 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

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

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

    2. A375353C01

      *1

      No. 2 Engine Room Relay Block and Junction Block Assembly

      *a

      ST 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

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. A317747C02

      *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

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

    1. Remove the ST relay from the 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

  13. INSPECT RELAY (ST RELAY)

    1. Inspect the ST relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RELAY (ST 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