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Home >> Lexus >> 2021 >> RX 450h Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes) (8 Of 8) & Circuit Tests) >> SFI System >> DTC P3190: Poor Engine Power; DTC P3191: Engine does not Start [10/2015 - 12/2017] >> Monitor Description
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Monitor Description

  1. The ECM assembly receives signals such as requested engine torque, target engine speed and engine cranking status from the hybrid vehicle control ECU assembly.
  2. The ECM assembly controls engine start and stop and throttle valve angle based on the signals received from the hybrid vehicle control ECU assembly.
  3. The ECM assembly 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 assembly judges that the engine output is abnormal and stores DTC P3190.

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

    1. *: Requested torque = Requested Engine Torque (kW) / HV Target Engine Speed (rpm) x 9549
  5. If the ECM assembly 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 P3191.

    HINT: 

    • When DTCs P3190, P3191 and P3193 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 becomes depleted ultimately and the power switch cannot be turned on (READY).
    • When DTC P3190 or P3191 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.

      Relevant Data List Items:

      ECM ASSEMBLY (Powertrain / Engine and ECT / Data List)
      HV Target Engine Speed Engine Speed Requested Engine Torque Actual Engine Torque
      Throttle Position Command Throttle Position No. 1 Calculate Load Coolant Temp
      Short FT #1, #2 Long FT #1, #2 EGR Step Position -
      HYBRID VEHICLE CONTROL ECU ASSEMBLY (Powertrain / Hybrid Control / Data List)
      Target Engine Rev Engine Revolution Requested Engine Torque Engine Coolant Temp
      Engine Idling Request - - -
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