Dtc P1608 Engine Lack Of Power

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

INSPECTION PROCEDURE

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

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1608)

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

DTC P1608 Engine Lack of Power


DESCRIPTION

This DTC is stored if engine output decreases due to a malfunction in the intake or exhaust system, fuel system or cooling system.
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.

P1608
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
-
With the accelerator pedal fully depressed, engine output decreases for approximately 4 to 10 seconds due to a broken component in the intake or exhaust system, fuel system or cooling system or malfunction in one of those systems.
(1 trip detection logic)
  1. Intake system clogged
  2. EGR valve stuck closed
  3. Deterioration of mass air flow meter (foreign matter present on sensor element etc.)
  4. Intake system hose disconnected or cracked
  5. Turbocharger sub-assembly vane stuck fully open
  6. Manifold absolute pressure sensor
  7. Manifold absolute pressure sensor out of range
  8. Atmospheric pressure sensor (built into ECM)
  9. Suction control valve sticking
  10. Fuel leak
  11. Fuel pressure sensor (built into injector assembly)
  12. Engine coolant leak
  13. Radiator assembly clogged
  14. Engine coolant temperature sensor
  15. Engine coolant temperature sensor out of range or stuck
  16. Fuel filter element sub-assembly
  17. Injector assembly
  18. Fan

INSPECTION PROCEDURE

HINT:
  1. In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1608 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as engine lack of power or hesitation.
    As the DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC without performing any troubleshooting and return the vehicle to the customer.
  2. If any other DTCs are output, perform troubleshooting for those DTCs first.
  3. Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
  4. When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data.

  5. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P1608 Engine Lack Of Power
    The fourth set of freeze frame data is the data recorded when the DTC is stored.
1.DTC OUTPUT (RECORD STORED DTC AND FREEZE FRAME DATA (PROCEDURE 1))

  1. Connect the GTS to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine / Trouble Codes.

  1. Record the stored DTC and freeze frame data.

    HINT:
    This freeze frame data shows the actual engine conditions when engine lack of power trouble occurred.

NEXT


2.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1608)

  1. Connect the GTS to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine / Trouble Codes.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P1608 is output
    		A
    P1608 and other DTCs are output
    		B
    HINT:
    If any DTCs other than DTC P1608 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (HILUX_TGN26 RM0000031HW04UX.html)
A


3.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.

    MAF Low
    Judgment of Data List Values
    		Problem Cause
    		Trouble Area
    		Diagnosis Note
    "MAF Low" in freeze frame data is ON
    		Intake air volume introduced via the mass air flow meter is insufficient and fuel injection volume remains suppressed
    1. Intake system clogged
    2. EGR valve stuck closed
    3. Deterioration of mass air flow meter sub-assembly (foreign matter present on sensor element etc.)
    1. EGR fully closed learning
    2. EGR Active Test
    HINT:
    Refer to Lack of Power or Hesitation for the inspection procedure (HILUX_TGN26 RM000000W0E0B5X_04_0119.html).

    Boost Pressure Low
    Judgment of Data List Values
    		Problem Cause
    		Trouble Area
    		Diagnosis Note
    "Boost Pressure Low" in freeze frame data is ON
    		Actual boost pressure is lower than the target boost pressure and fuel injection volume remains suppressed
    1. Intake system hose disconnected or cracked
    2. Turbocharger sub-assembly vane stuck fully open
    3. Manifold absolute pressure sensor
    4. Manifold absolute pressure sensor out of range
    5. Atmospheric pressure sensor (built into ECM)
    6. Abnormal pressure difference between the atmospheric pressure sensor and manifold absolute pressure sensor
    7. EGR valve stuck closed
    		The possible malfunctioning areas can be narrowed down by checking "MAF/Estimate MAF Ratio" when "Boost Pressure Low" in the freeze frame data is ON.
    HINT:
    Refer to Lack of Power or Hesitation for the inspection procedure (HILUX_TGN26 RM000000W0E0B5X_04_0109.html).

    MAF/Estimate MAF Ratio
    Judgment of Data List Values
    		Problem Cause
    		Trouble Area
    		Diagnosis Note
    "MAF/Estimate MAF Ratio" in freeze frame data is 1.4 or more
    		Air that has passed through the mass air flow meter leaks, and the estimated intake air volume becomes less than the actual intake air volume.
    		Intake air leak due to intake pipe disconnection or cracks between the turbocharger sub-assembly and intercooler assembly or between the intercooler assembly and intake manifold.
    HINT:
    Refer to Lack of Power or Hesitation for the inspection procedure (HILUX_TGN26 RM000000W0E0B5X_04_0109.html).
    "MAF/Estimate MAF Ratio" in freeze frame data is below 0.6
    		Air that has not passed through the mass air flow meter is supplied to the engine, and the actual intake air volume becomes less than the estimated intake air volume.
    		Air entering due to intake pipe disconnection or cracks between the turbocharger sub-assembly and intercooler assembly or between the intercooler assembly and intake manifold.

    Common Rail Pressure Low
    Judgment of Data List Values
    		Problem Cause
    		Trouble Area
    		Diagnosis Note
    "Common Rail Pressure Low" in freeze frame data is ON
    		Common-rail pressure remains below the target value.
    1. Suction control valve sticking
    2. Fuel leak
    3. Fuel filter element sub-assembly clogged
    4. Fuel pressure sensor (built into injector assembly)
    HINT:
    Refer to Lack of Power or Hesitation for the inspection procedure (HILUX_TGN26 RM000000W0E0B5X_04_0127.html).

    Engine Coolant Temp High
    Judgment of Data List Values
    		Problem Cause
    		Trouble Area
    		Diagnosis Note
    "Engine Coolant Temp High" in freeze frame data is ON
    		Coolant temperature remains high (overheating) and fuel injection volume remains suppressed.
    1. Engine coolant leak
    2. Radiator assembly clogged
    3. Engine coolant temperature sensor
    4. Engine coolant temperature sensor out of range or stuck
    5. Fan
    		Cooling system including radiator assembly
    HINT:
    Perform the next inspection if there are no problems with the above items.

NEXT

GO TO LACK OF POWER OR HESITATION (HILUX_TGN26 RM000000W0E0B5X.html)