Dtc P1604 Startability Malfunction

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

INSPECTION PROCEDURE

CHECK IF ENGINE CRANKS

CHECK FOR ANY OTHER DTCS OUTPUT

CHECK FREEZE FRAME DATA

DTC P1604 Startability Malfunction


DESCRIPTION

If the engine does not start or it takes a long time for the engine to start although the STA signal is input to the ECM, this DTC will be stored.
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 moving or stationary, 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.
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
P1604
Either of the conditions is met (1 trip detection logic):
  1. The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below)
  2. After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds
  1. Immobiliser system
  2. Engine unit (excessive friction, decreased compression)
  3. Starter system
  4. Crankshaft position sensor circuit
  5. Engine coolant temperature sensor circuit
  6. Fuel pump (for fuel main tank)
  7. Fuel pump control circuit
  8. Fuel line
  9. Fuel injector assembly circuit
  10. Throttle body with motor assembly
  11. Pressure regulator
  12. Battery
  13. Drive plate
  14. Spark plug
  15. Ignition coil assembly circuit
  16. Intake system connection
  17. Camshaft timing oil control valve assembly
  18. Mass air flow meter sub-assembly
  19. Air fuel ratio sensor (sensor 1)
  20. Heated oxygen sensor (sensor 2)
  21. Valve timing
  22. Camshaft position sensor
  23. Fuel
  24. Purge VSV
  25. Sub tank fuel pump control circuit
  26. Fuel pump (for fuel sub tank)
  27. Fuel jet
  28. Solenoid valve assembly (for fuel injection volume control)
  29. Solenoid valve assembly (for fuel cut control)
  30. ECM

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P1604 Startability Malfunction


INSPECTION PROCEDURE

HINT:
  1. 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 this DTC can be stored as a result of certain user actions, even if this DTC is output, if the customer makes no mention of problems, clear this DTC without performing any troubleshooting and return the vehicle to the customer.
  2. If any DTCs other than P1604 are output, troubleshoot those DTCs first.
  3. Since DTC P1604 is different from other DTCs, the following procedure is shown as a reference.
  4. 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 moving or stationary, 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.
1.CHECK IF ENGINE CRANKS

  1. Check if the engine cranks.

    Result:

    Result
    		Proceed to
    The engine cranks
    		A
    The engine does not crank
    		B


B
GO TO PROBLEM SYMPTOMS TABLE (HILUX_TGN26 RM000003S3U02RX.html)
A


2.CHECK FOR ANY OTHER DTCS OUTPUT

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result:

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


B
GO TO DTC CHART (HILUX_TGN26 RM000000PDF0EXX.html)
A


3.CHECK FREEZE FRAME DATA

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Check the following freeze frame data to see the state of the battery when the freeze frame data was recorded.

    Confirmation Item
    Battery Voltage

  1. Check the following freeze frame data to see if the engine was cranking when the freeze frame data was recorded.

    Confirmation Item
    Engine Speed
    Fuel Pump/Speed Status

  1. Check the following freeze frame data to check the temperature data recorded when the engine did not start normally.

    Confirmation Item
    Coolant Temp
    Intake Air

  1. Check the following freeze frame data to see the engine operating conditions recorded when the engine started.

    Confirmation Item
    MAF

  1. Check the following freeze frame data to see the air fuel ratio recorded when the engine started.

    Confirmation Item
    Long FT #1

  1. Check the following freeze frame data to see the FFV (Flexible Fuel Vehicle) information recorded when the engine did not start normally.

    Confirmation Item
    Alcohol Feedback Value
    Alc FB Val bfr F/Crrctn by Stall
    Trip aft F/Crrctn by Stall
    Fuel Dilution Estimate

  1. Use this information to perform a simulation test.

  1. Compare the "Normal Condition" information in the Data List (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 (HILUX_TGN26 RM000000PDQ0Q4X.html)
A

REPAIR OR REPLACE MALFUNCTIONING PARTS