Dtc P1604 Startability Malfunction


DESCRIPTION

INSPECTION PROCEDURE

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

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

TAKE SNAPSHOT DURING STARTING AND IDLING (PROCEDURE 3)

DETERMINE CAUSE OF PROBLEM (CHECK FREEZE FRAME DATA AND SNAPSHOT)

DTC 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.

DTC No.
DTC Detection Condition
Trouble Area
P1604
  1. The following conditions continue for 2 seconds or more* (1 trip detection logic).
    1. STA signal is input to the ECM
    2. Engine speed is 500 rpm or less
*: This time changes depending on the engine coolant temperature.
  1. Battery
  2. Engine immobiliser system
  3. Irregular fuel
  4. Lack of fuel
  5. Fuel supply pump
  6. Fuel injector
  7. Fuel filter
  8. Glow system
  9. Injector driver (EDU)
  10. ECT sensor
  11. Intake system
  12. Exhaust system
  13. Engine damaged, seized up
  14. Loss of compression
  15. Pressure discharge valve
  16. Fuel pressure sensor
  17. EGR system
  18. 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.
(1 trip detection logic)

Related Data List
DTC No.
Data List
P1604
  1. MAP
  2. MAF
  3. Intake Air
  4. Coolant Temp
  5. Battery Voltage
  6. Starter Signal
  7. Engine Speed of Cyl #1 (to #4)
  8. Immobiliser Communication
  9. Target Common Rail Pressure
  10. Fuel Press
  11. Target Pump SCV Current
  12. Injection Feedback Val #1 (to #4)
  13. Injection Volume
  14. Actual Throttle Position
  15. Target EGR Position
  16. Actual EGR Valve Pos.
  17. EGR Close Lrn. Status
  18. Pre Glow
  19. EGR Close Lrn. Val.
  20. After Glow

INSPECTION PROCEDURE

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

  2. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P1604 Startability Malfunction
    The fourth set of freeze frame data is the data recorded when the DTC is stored.

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

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

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 immobiliser system (Engine does not crank).

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

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


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.

      HINT:
      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.


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 clog.

    7. Problem with supply pump.

    8. Problem with common rail.

    9. Problem with injectors.


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P1604 Startability Malfunction


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.

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

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Record the stored DTC and Freeze Frame Data.

    HINT:
    This freeze frame data shows the actual engine conditions when engine starting trouble occurred.

NEXT


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

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P1604 is output
    		A
    P1604 and other DTCs are output
    		B
    HINT:
    If any DTCs other than DTC P1604 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART
A


3.TAKE SNAPSHOT DURING STARTING AND IDLING (PROCEDURE 3)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P1604 Startability Malfunction

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.

  1. Take a snapshot of the following Data List items with the intelligent tester during "ignition switch ON (5 seconds) → Starting → Idling (10 seconds)".


NEXT


4.DETERMINE CAUSE OF PROBLEM (CHECK FREEZE FRAME DATA AND SNAPSHOT)

  1. Determine the cause of the problem based on the freeze frame data recorded in Procedure 1 and the Data List values recorded when starting the engine in Procedure 3.

    Coolant Temp
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Coolant Temp" in freeze frame data is less than 35°C (95°F)
    		Engine starting trouble which occurred with cold engine
    		-
    1. The engine coolant temperature is 60 to 90°C (140 to 194°F) after warming up the engine.
    2. Normally, "Coolant Temp" is the same as the outside air temperature after an overnight engine soak.
    3. Engine starting trouble with a cold engine occurs when the engine coolant temperature sensor is malfunctioning.
    "Coolant Temp" in freeze frame data is less than 35°C (95°F).
    Currently, no engine starting trouble (cranking time less than 4 seconds) after warming up engine ("Coolant Temp" is 60°C (95°F) or more).
    		Engine starting trouble which only occurs with cold engine

    Engine Speed
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Engine Speed" in freeze frame data is less than 120 rpm
    		Engine starting trouble may have occurred because engine speed was too low
    1. During cranking: 120 to 400 rpm
    2. Idling with warm engine: 700 to 800 rpm
    1. The battery may be fully depleted or the battery terminals may be loose.
    2. The viscosity of the engine oil may be inappropriate (low viscosity oil is not used).
    "Engine Speed" in Data List is less than 120 rpm when cranking engine

    Battery Voltage
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Battery Voltage" in freeze frame data is below 6 V
    		Engine starting trouble may have occurred because battery is fully depleted
    		During cranking: 6 V or higher
    		The battery may be fully depleted or the battery terminals may be loose.
    "Battery Voltage" in Data List is below 6 V when cranking engine

    Fuel Press
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Fuel Press" in freeze frame data is below 1000 kPa
    		Problem supplying fuel to fuel supply pump (low pressure side)
    1. Ran out of fuel, air in fuel, fuel frozen (in this case, values of "Fuel Temperature" and "Coolant Temp" in freeze frame data are low)
    2. Fuel filter clog, fuel line clog (low pressure side) or fuel leak
    3. Feed pump (in fuel supply pump) malfunctioning
    		When in a stable condition such as when idling, the fuel pressure is within +/-5000 kPa of the target fuel pressure
    		Disconnect the inlet hose from the fuel supply pump (low pressure side), operate the hand pump and check that fuel is being supplied.
    "Fuel Press" in Data List is below 1000 kPa 2 seconds after engine cranking is started
    "Fuel Press" in freeze frame data is below 25000 kPa
    		Problem supplying fuel to fuel supply pump (low pressure side) or problem on high pressure side
    1. Fuel supply pump (SCV operation malfunction)
    2. Common rail assembly
    3. Fuel injector (if glow plug is covered with fuel when removed, injector of corresponding cylinder may be stuck open)
    4. Fuel line clog (high pressure side), fuel leak
    		When in a stable condition such as when idling, the fuel pressure is within +/-5000 kPa of the target fuel pressure
    1. For startup, at least 25000 kPa of fuel pressure is needed (take care as there is a response lag when the pressure rises).
    2. If "Fuel Press" is 15000 kPa or less, fuel injection control is stopped.
    After cranking is started, "Fuel Press" in Data List increases to 25000 kPa or more and then decreases to below 15000 kPa
    "Fuel Press" in freeze frame data or Data List changes within range of 40000 to 45000 kPa
    1. Injector (fuel injection problem caused by air in injector)
    2. Problem with injection system
    		When in a stable condition such as when idling, the fuel pressure is within +/-5000 kPa of the target fuel pressure
    1. If there is air in the injectors for all cylinders, fuel cannot be injected.
    2. If there is an injection system problem related to 2 or more cylinders, fuel delivery and injection control are stopped.
    3. When the EDU circuit has a malfunction (e.g. an EDU relay or fuse malfunction), the ECM cannot perform diagnosis of malfunctions and DTCs are not stored as voltage is unstable during cranking. Also, an excess amount of fuel is supplied by the fuel supply pump and "Fuel Press" becomes larger than "Target Common Rail Pressure" as fuel injection cannot be performed even though a fuel injection signal is output due to a failure to detect malfunctions at engine start.

    Target Pump SCV Current
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Target Pump SCV Current" in freeze frame data is not between 800 and 3000 mA or fluctuates (by 1000 mA or more)
    1. Fuel supply pump (SCV operation malfunction)
    2. Fuel line clog
    3. Air in fuel line
    1. Normally, value is between 800 and 3000 mA
    2. During cranking: 2000 mA or less
    		An excessively large value is displayed due to a problem with fuel feed.
    "Target Pump SCV Current" in Data List is not between 800 and 3000 mA or fluctuates (by 1000 mA or more) when cranking engine

    Injection Feedback Val #1(to #4)
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Injection Feedback Val #1 (to #4)" in freeze frame data is not +3.0 mm3/st or less
    		Fuel injector malfunction or compression problem
    		-3.0 to 3.0 mm3/st
    		If a fuel injector is malfunctioning, even though the engine starts, idling is rough.
    "Injection Feedback Val #1 (to #4)" in Data List is not +3.0 mm3/st or less when idling

    Injection Volume
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Injection Volume" in Data List is 10 mm3/st or less and "Injection Feedback Val #1 (to #4)" is +3.0 mm3/st or less when idling after warming up engine
    		Fuel injectors of all cylinders malfunctioning
    		-
    		-

    Main Injection Period
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Main Injection Period" in freeze frame data or Data List is 0 μs
    1. Fuel supply pump (when SCV has open or short circuit, fuel supply from pump stops)
    2. Problem with injection system (injector circuit is open (2 cylinders or more) or EDU is malfunctioning)
    3. Problem with engine immobiliser system
    4. Engine speed 60 rpm or less
    5. ECM malfunction
    		-
    		Indicates that fuel injection control has stopped.

    Immobiliser Communication
    Judgment of Data List Values
    		Problem Cause
    		Normal Condition
    		Diagnosis Note
    "Immobiliser Communication" in freeze frame data or Data List is OFF
    		Engine immobiliser system
    		ON
    		Fuel injection has stopped due to engine immobiliser system.

NEXT

GO TO ENGINE DIFFICULT TO START OR STALLING (Toyota Fortuner RM000000TJ505IX.html)