Lexus ES: Poor Engine Power (P319000,P319100)

1. The ECM receives signals such as requested engine torque, target engine speed and engine cranking status from the hybrid vehicle control ECU assembly.
2. The ECM controls engine start and stop and the throttle valve angle based on the signals received from the hybrid vehicle control ECU assembly.
3. The ECM receives the actual engine torque calculated by the hybrid vehicle control ECU assembly based on the generator torque.
4. When the actual engine torque is less than 20% of the requested engine torque*, the ECM judges that the engine output is abnormal and stores DTC P319000.

   (The engine may not have started in the above situation.)

   • *: Requested torque = Requested Engine Torque (kW) / HV Target Engine Speed (rpm) x 9549
5. If the ECM does not detect engine start torque (actual engine torque) even though it has received an engine start request and started the engine, it stores DTC P319100.

   HINT:

   • When DTCs P319000, P319100 and P319300 are output, the engine may be stopped due to the engine condition.

     At this time, after adding fuel or performing repairs, clear the DTCs. Then turn the power switch off to return to the normal condition.

   • When this DTC is output and the engine is stopped, the HV battery cannot be charged since the vehicle is driven with the motor only. If the vehicle continues to be driven under this condition, the HV battery will be come depleted and the power switch will not be able to be turned on (READY).
   • When DTC P319000 or P319100 is stored, the engine torque has dropped by 80% or the engine cannot be started. If any DTCs that indicate malfunctioning of engine related parts are stored at the same time, repair the malfunctioning parts first.
   • If engine knock is detected due to mechanical noise or a knock control sensor being loose, the ignition timing (Knock F/B Value, Knock Correct Learn Value) may be excessively retarded and DTC P319000 may be stored.

     Relevant Data List Items:

     ECM (Powertrain / Engine / Data List)
     HV Target Engine Speed	Engine Speed	Requested Engine Torque	Actual Engine Torque
     Throttle Position Command	Throttle Position Sensor No.1 Voltage	Calculate Load	Coolant Temperature
     Short FT B1S1	Long FT B1S1	Target EGR Valve Position No.1	Ignition Timing Cylinder #1
     Knock F/B Value	Knock Correct Learn Value	-	-

     Hybrid Vehicle Control ECU (Powertrain / Hybrid Control / Data List)
     Target Engine Revolution	Engine Speed	Target Engine Power	Coolant Temperature
     Engine Idling Request	-	-	-

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

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• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

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1. Apply the parking brake firmly.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
6. Turn the power switch off and wait for at least 30 seconds.
7. Turn the power switch on (READY).
8. Turn the Techstream on.
9. Fully depress the accelerator pedal for 10 seconds with the vehicle stopped, the shift lever in P and the brake pedal depressed [A].

   NOTICE:

   As soon as the engine starts, release the accelerator pedal.

10. Release the parking brake.
11. Drive the vehicle at an average of approximately 40 km/h (25 mph) or more until the total engine operation time is 10 minutes or more [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    • It is not necessary to maintain the vehicle speed at 40 km/h (25 mph) throughout the road test.
    • If the engine stops, further depress the accelerator pedal to restart the engine.
12. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
13. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Input the DTC: P319000 or P319100.
16. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system is malfunctioning.
    • If the judgment result shows INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.
    • [A] to [C]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

NOTICE:

• Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.

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  (Select Powertrain in Health Check and then check the time stamp data.)

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• If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

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HINT:

• Performing this diagnosis procedure repeatedly for symptom confirmation may cause the SOC to drop, preventing the system from entering the READY-on state. In this case, use the THS charger to charge the HV battery.
• Cranking the engine once causes the SOC to drop approximately 1%.
• Charging the HV battery once (10 minutes) using the THS charger restores the SOC approximately 2%.
• Charging the HV battery using the THS charger takes approximately 10 minutes when the HV battery temperature is 25°C (77°F) or approximately 30 minutes when the HV battery temperature is 0°C (32°F).
• The THS charger is a supplemental charging device that charges the HV battery enough to enable the engine to start (the vehicle can enter the READY-on state).
• Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT:

• DTCs P319000, P319100 and/or P319300 may be output if the vehicle ran out of fuel in the past.
• If not enough fuel is added, DTC P319000, P319100 or P319300 may be output again. If the engine cannot be started because the vehicle is out of fuel, add fuel until the fuel level warning turns off.

NOTICE:

• Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
• Do not leave the EGR valve open for 10 seconds or more during the Active Test.
• Be sure to return the EGR valve to step 0 when the Active Test is completed.
• Do not open the EGR valve 30 steps or more during the Active Test.

HINT:

• If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
• While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
• Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
• If the Active Test cannot be performed due to a malfunction such as the engine not starting, perform the EGR valve assembly inspection the following step.

 Fuel Run Out (P319300)

 Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)

 Lost Communication with Brake System Control Module Missing Message (U012987)

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