ECD SYSTEM, Diagnostic DTC:P1608

DTC Code DTC Name
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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1608

Engine Lack of Power

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).

  • Intake system clogged

  • EGR valve stuck closed

  • Deterioration of mass air flow meter assembly (foreign matter present on sensor element etc.)

  • Intake system hose disconnected or cracked

  • Turbocharger sub-assembly vane stuck fully open

  • Manifold absolute pressure sensor

  • Manifold absolute pressure sensor out of range

  • Atmospheric pressure sensor (built into ECM)

  • Suction control valve sticking

  • Fuel leak

  • Fuel pressure sensor (built into common rail assembly)

  • Engine coolant leak

  • Radiator assembly clogged

  • Engine coolant temperature sensor

  • Engine coolant temperature sensor out of range or stuck

  • Fuel filter element assembly

  • Injector assembly

  • Fan

Does not come on

DTC stored

CAUTION / NOTICE / HINT

A103809E77
Tip:

  • 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.

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

  • 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.

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

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

PROCEDURE

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

    1. Connect the GTS to the DLC3.

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

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

    4. Record the stored DTCs and freeze frame data.

      Powertrain > Engine > Trouble Codes

      Tip:

      This freeze frame data shows the actual engine conditions when engine rack of power trouble occurred.

    Result

    Proceed to

    NEXT
    NEXT

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

    1. Connect the GTS to the DLC3.

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

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

    4. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P1608 is output

      A

      DTC P1608 and other DTCs are output

      B
      Tip:

      If any DTCs other than DTC P1608 are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click hereClick here

    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.

      Table 1. MAF Low

      Judgment of Data List Values

      Problem Cause

      Normal Condition

      Diagnosis Note

      "MAF Low" in freeze frame data is ON

      Intake air volume introduced via the mass air flow meter assembly is insufficient and fuel injection volume remains suppressed

      • Intake system clogged

      • EGR valve stuck closed

      • Deterioration of mass air flow meter assembly (foreign matter present on sensor element etc.)

      • EGR fully closed learning

      • EGR Active Test

      Tip:

      Refer to Lack of Power or Hesitation for the inspection procedure.

      Click here
      Table 2. Boost Pressure Low

      Judgment of Data List Values

      Problem Cause

      Normal Condition

      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

      • Intake system hose disconnected or cracked

      • Turbocharger sub-assembly vane stuck fully open

      • Manifold absolute pressure sensor

      • Manifold absolute pressure sensor out of range

      • Atmospheric pressure sensor (built into ECM)

      • Abnormal pressure difference between the atmospheric pressure sensor and manifold absolute pressure sensor

      • 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

      Tip:

      Refer to Lack of Power or Hesitation for the inspection procedure.

      Click here
      Table 3. MAF/Estimate MAF Ratio

      Judgment of Data List Values

      Problem Cause

      Normal Condition

      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 assembly leaks, and the estimated intake air volume becomes less than the actual intake air volume.

      Intake air leak due to intake pipe disconnection or leaks between the turbocharger sub-assembly and intercooler assembly or between the intercooler assembly and intake manifold.
      Tip:

      Refer to Lack of Power or Hesitation for the inspection procedure.

      Click here

      "MAF/Estimate MAF Ratio" in freeze frame data is below 0.6

      Air that has not passed through the mass air flow meter assembly 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 leaks between the turbocharger sub-assembly and intercooler assembly or between the intercooler assembly and intake manifold.
      Table 4. Common Rail Pressure Low

      Judgment of Data List Values

      Problem Cause

      Normal Condition

      Diagnosis Note

      "Common Rail Pressure Low" in freeze frame data is ON

      Common rail pressure remains below the target value.

      • Suction control valve sticking

      • Fuel leak

      • Fuel filter element assembly clogged

      • Fuel pressure sensor (built into common rail assembly)
      Tip:

      Refer to Lack of Power or Hesitation for the inspection procedure.

      Click here
      Table 5. Engine Coolant Temp High

      Judgment of Data List Values

      Problem Cause

      Normal Condition

      Diagnosis Note

      "Engine Coolant Temp High" in freeze frame data is ON

      Coolant temperature remains high (overheating) and fuel injection volume remains suppressed.

      • Engine coolant leak

      • Radiator assembly clogged

      • Engine coolant temperature sensor

      • Engine coolant temperature sensor out of range or stuck

      • Fan

      Cooling system including radiator assembly
      Tip:

      Perform the next inspection if there are no problems with the above items.

    Result

    Proceed to

    NEXT
    NEXT

    GO TO LACK OF POWER OR HESITATION

    Click here