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SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P1603, P1605

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DTC Code DTC Name
P1603 Engine Stall History
P1605 Rough Idling
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DESCRIPTION


After starting the engine, this DTC is stored when the engine stops without the engine switch being operated.

Using the GTS, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle has run out of fuel before performing troubleshooting, as this DTC is also stored when the engine stalls due to running out of fuel.


This DTC is stored if the engine speed drops below the set speed.

Using the GTS, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when idling is unstable due to running out of fuel.

DTC No. Detection Item DTC Detection Condition MIL Memory
P1603 Engine Stall History After monitoring for startability problems (P1604) finishes and 2 seconds or more have elapsed after starting the engine, with the engine running, the engine stops (the engine speed drops to 200 rpm or less) without the engine switch being operated for 0.5 seconds or more (1 trip detection logic). Does not come on DTC stored
P1605 Rough Idling After 5 seconds or more have elapsed after starting the engine, with the engine running, the engine speed drops to 400 rpm or less (1 trip detection logic). Does not come on DTC stored
Trouble Area
Ignition system

  • Spark plug

  • Ignition coil assembly
Fuel system

  • Fuel injector assembly (for port injection)

  • Fuel injector assembly (for direct injection)

  • Fuel pump (for low pressure side)

  • Fuel pump (for high pressure side)

  • Fuel pump control circuit

  • Fuel line

  • Purge VSV system

  • Fuel quality (existence of foreign matter, degradation)
Intake and exhaust systems

  • Mass air flow meter sub-assembly

  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body with motor assembly

  • Air fuel ratio sensor

  • Heated oxygen sensor

  • Camshaft timing control motor

  • Camshaft timing oil control valve assembly

  • Variable Valve Timing system (VVT system)

  • Brake booster assembly
Other control systems

  • ECM

  • Wire harness or connector

  • Knock control sensor

  • Engine coolant temperature sensor
Engine

  • Thermostat

  • Engine assembly
High load from another system

  • Air conditioning system

  • Power steering system

  • Electrical load signal system

  • A/T system
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CAUTION / NOTICE / HINT

Tip:

  • DTC P1603 / P1605


    • In contrast to normal malfunction diagnosis for components, circuits and systems, DTCs P1603 and P1605 are 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.

    • As DTCs may be stored when an Active Test or learning is performed, make sure to clear the DTCs before returning the vehicle to the customer.

    • If any other DTCs are output, perform troubleshooting for those DTCs first.

  • CUSTOMER PROBLEM ANALYSIS

    Use any information from the customer problem analysis about the condition of the vehicle at the time when the problem occurred (how the engine stopped, conditions when the engine was restarted, etc.) as a reference.

    Symptom Suspected Area
    Engine vibration occurs and engine stops

    • Abnormal mass air flow meter sub-assembly output due to existence of foreign matter

    • Abnormal air fuel ratio due to malfunction of air fuel ratio sensor or heated oxygen sensor, air leaks in intake system or insufficient fuel supply
    Engine stops with no engine vibration Ignition system, injection stoppage, high load from external parts
    Engine can be started with accelerator pedal depressed Insufficient air volume
    Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

  • FREEZE FRAME DATA


    • Read freeze frame data using the GTS. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

    • When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data.

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    • When DTC P1603 (Engine Stall History) is stored, DTC P1605 (Rough Idling) is also stored. When confirming freeze frame data, check DTC P1605. The ECM stores DTC P1605 first. Therefore, 5 sets of freeze frame data can be confirmed through DTC P1605, enabling the technician to obtain more information.

    • When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.

    • Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare this data with the freeze frame data.

  • PRECAUTIONS


    • Inspections take into account the fact that the malfunction may not have recurred and place emphasis on checking the vehicle conditions present at the time when the malfunction occurred.

    • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.

    • Bank 1 refers to the bank that includes the No. 1 cylinder.*

      *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

    • Bank 2 refers to the bank that does not include the No. 1 cylinder.

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PROCEDURE


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    CHECK FOR ANY OTHER DTCS OUTPUT


    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.

    5. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


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

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

      • Using freeze frame data, confirm the conditions the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.


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    READ FREEZE FRAME DATA (ISC LEARNING VALUE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

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      Result
      Freeze Frame Data Item for DTC P1605 Result Suspected Area Action Proceed to
      ISC Learning Value Less than 6.2 L/s - Go to the next step A
      6.2 L/s or higher Throttle valve assembly Go to ENGINE STALLS (from step 11) B

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    READ FREEZE FRAME DATA (AFS VOLTAGE B1S1 (B1S2), SHORT FT #1 (#2) AND LONG FT #1 (#2))


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

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      Result
      Freeze Frame Data Item for DTC P1605 Suspected Area Action Proceed to
      AFS Voltage B1S1 (B1S2) Short FT B1S1 (B2S1) Long FT B1S1 (B2S1)
      3.8 V or higher 15% or higher - Fuel pump Go to ENGINE STALLS (from step 20) NEXT
      Less than 2.8 V, or 3.8 V or higher Less than -15%, or 15% or higher Less than -15%, or 15% or higher

      • Mass air flow meter sub-assembly

      • Air fuel ratio sensor

      • Fuel pump

      		 Go to ENGINE STALLS (from step 15)*
      2.8 V to 3.8 V -15% to 15% -15% to 15% - Go to ENGINE STALLS
      Tip:

      *: If the value of AFS Voltage B1S1 (B1S2), Short FT B1S1 (B2S1) or Long FT B1S1 (B2S1) is as specified, malfunction of a component listed in the "Suspected Area" column of the table is suspected.