SFI SYSTEM, Diagnostic DTC:P1603

DTC Code DTC Name
P1603 Engine Stall History

DESCRIPTION

This DTC is stored if the engine stalls because of reasons other than engine switch operation after the engine has started.

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

It is necessary to check if the vehicle has run out of fuel before starting diagnosis because this DTC is also stored due to running out of fuel.

DTC No. DTC Detection Condition Trouble Area
P1603

After monitoring for startability problems (P1604) finishes and 5 seconds or more elapse after starting the engine, the engine stops for 0.5 seconds or more (the engine speed drops to 200 rpm or less) without the engine switch being operated

(1 trip detection logic)

  • Intake system connection

  • Purge VSV

  • Brake booster

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Wire harness or connector

  • Air fuel ratio sensor (sensor 1)

  • Power source circuit (purge VSV, fuel injector assembly, ignition coil assembly)

  • Fuel pump

  • Fuel pump control circuit

  • Fuel line

  • Throttle position sensor (built into throttle with motor body assembly)

  • Camshaft timing oil control valve assembly

  • Knock control sensor

  • Air conditioner system

  • Power steering system

  • Electrical load signal circuit

  • A/T or CVT system

  • Park/neutral position switch circuit

  • ECM

INSPECTION PROCEDURE

Tech Tips


  • In contrast to normal malfunction diagnosis for components, circuit and systems, DTC P1603 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as engine stall.

    As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.

  • If any DTCs other than P1603 are output, troubleshoot those DTCs first.

  • Since DTC P1603 is different from other DTCs, the following procedure is shown as a reference.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P1603 and/or P1605 is output A
      DTC P1603 and/or P1605 and other DTCs are output B

      Tech Tips

      If any DTCs other than P1603 and/or P1605 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Check the following freeze frame data to see if the engine was cold or warm when the freeze frame data was recorded.

      Confirmation Item
      Coolant Temp
      Initial Engine Coolant Temp
      Initial Intake Air Temp
      Engine Run Time

    5. Check the following freeze frame data to see if the vehicle was idling, cruising, decelerating, accelerating, starting off, or stopped.

      Confirmation Item
      Engine Speed
      Vehicle Speed
      Throttle Sensor Position
      Throttle Sensor Volt %
      Throttl Sensor #2 Volt %
      Accel Sens. No. 1 Volt %
      Accel Sens. No. 2 Volt %
      Neutral Position SW Signal
      Stop Light Switch
      Closed Throttle Position SW

    6. Check the following freeze frame data to see the shift step and lock-up state recorded when the engine stalled.

      Confirmation Item
      Shift SW Status
      Lock Up

    7. Check the following freeze frame data to see the engine load and electrical load when the freeze frame data was recorded.

      Confirmation Item
      Calculate Load
      Electrical Load Signal*1, Electrical Load Signal 1*2, Electrical Load Signal 3*2
      A/C Signal
      Power Steering Signal

      *1: for models w/ CVT (w/o Euro-OBD)

      *2: for other models

    8. Check the following freeze frame data to see purge VSV operation when the freeze frame data was recorded.

      Confirmation Item
      EVAP (Purge) VSV

    9. Check the following freeze frame data to see engine idle related information from when the freeze frame data was recorded.

      Confirmation Item
      Shift SW Status (P Range)
      Shift SW Status (N Range)

    10. Check the following freeze frame data to see the air fuel ratio recorded when the engine stalled.

      Confirmation Item
      Short FT #1
      Long FT #1
      AFS Voltage B1S1

    11. Check the following freeze frame data to see the ignition timing recorded when the engine stalled.

      Confirmation Item
      IGN Advance
      Knock Correct Learn Value

    12. Use this information to perform a simulation test.

    13. Compare the "Normal Condition" in the Data List table (reference values) with the freeze frame data listed above and with the simulation test results to determine the problem cause.

      Result
      Result Proceed to
      The problem cause can be determined. A
      The problem cause cannot be determined. B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

    REPAIR OR REPLACE MALFUNCTIONING PARTS