ECD SYSTEM (w/o DPF), Diagnostic DTC:P1604

DTC Code DTC Name
P1604 Startability Malfunction

DESCRIPTION

This DTC is stored if the engine does not start or continues to crank without starting for certain period of time. This DTC is also stored if the vehicle has run out of fuel. It is necessary to check whether there was enough fuel in the fuel tank before inspection.

P1604
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After engine is started

  • Both conditions are met for 2 seconds or more*1 (1 trip detection logic):


    • STA signal is input to the ECM.

    • Engine speed is 500 rpm or less.

*1: The time required for DTC detection may be as much as 30 seconds depending on the engine coolant temperature and atmospheric pressure.

  • Battery

  • Entry and start system

  • Engine immobiliser system

  • Irregular fuel

  • Lack of fuel

  • Suction control valve (fuel supply pump assembly)

  • Injector assembly

  • Fuel filter element sub-assembly

  • Glow system

  • Injector driver

  • Engine coolant temperature sensor

  • Intake system

  • Exhaust system

  • Engine damaged, seized up

  • Loss of compression

  • Pressure discharge valve (common rail assembly)

  • Fuel pressure sensor (common rail assembly)

  • EGR system

  • Diesel throttle system

After starting the engine (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within 2 seconds*2 (1 trip detection logic).

*2: This DTC may be stored when the engine stalls due to clutch misoperation.
Related Data List
DTC No. Data List
P1604

  • MAP

  • MAF

  • Intake Air

  • Coolant Temp

  • Battery Voltage

  • Starter Signal

  • Engine Speed of Cyl #1 (to #8)

  • Immobiliser Communication

  • Target Common Rail Pressure

  • Fuel Press

  • Target Pump SCV Current

  • Injection Feedback Val #1 (to #8)

  • Injection Volume

  • Actual Throttle Position

  • Throttle Motor Duty #1, #2

  • Target EGR Valve Position

  • Actual EGR Valve Pos.

  • EGR Close Lrn. Status

  • Pre Glow

  • After Glow

INSPECTION PROCEDURE

Tech Tips


  • In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.

    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.

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

  • A015DV4E51

    The fourth set of freeze frame data is the data recorded when the DTC is stored.


  1. In order to start the engine, the starting system, glow system, fuel system and the components related to compression must be functioning properly.

  2. The cause of the problem can be narrowed down by checking if the engine cranks normally.

  3. Starting system (when cranking is abnormal)


    1. The engine cannot be started if a sufficient cranking speed cannot be obtained. The following are possible causes of an insufficient cranking speed.


      1. Problem with the entry and start system (Engine does not crank).

      2. Problem with the immobiliser system (Engine does not crank).

      3. Problem with the battery (Cranking speed is low).

      4. Problem with the starter (Cranking speed is low).

  4. Glow system (when cranking is normal)


    1. When there is a problem with the glow system, the intake air temperature does not rise adequately and the fuel combustion temperature is not reached. Therefore, there is no initial combustion or it takes time for the engine to start. The following are possible causes.


      1. Engine coolant temperature sensor malfunction.

      2. Glow plug malfunction.

        Tech Tips

        If the glow plug has deteriorated, the engine may be less likely to start when the outside temperature is lower than 0°C.

      3. Glow relay malfunction.

  5. Fuel system (when cranking is normal)


    1. The engine cannot be started if fuel is not supplied. A minimum fuel pressure of 25000 kPa or higher must be supplied to start the engine. The following are possible causes of insufficient fuel pressure.


      1. Fuel line clog.

      2. Lack of fuel.

      3. Fuel frozen.

      4. Low quality fuel.

      5. Air in fuel pipe.

      6. Fuel filter element sub-assembly clog.

      7. Problem with fuel supply pump assembly.

      8. Problem with common rail assembly.

      9. Problem with injector assemblies.

    A0158PVE07

  6. Engine assembly


    1. There may be a problem with the engine unit itself if there is no problem with cranking, the glow system or fuel system.


      1. Engine friction too high.

      2. Insufficient compression.

PROCEDURE


  1. READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA) (PROCEDURE 1)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

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

    4. Record the stored DTCs and freeze frame data.

      Tech Tips

      Freeze frame data shows the actual engine conditions when engine starting trouble occurred.


    NEXT

  2. CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1604)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      P1604 is output A
      P1604 and other DTCs are output B

      Tech Tips

      If any DTCs other than DTC P1604 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

    ENGINE DIFFICULT TO START OR STALLING Click here