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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Heating / Air Conditioning System - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> DTC P0EC9-71: A/C Low Pressure Magnetic Valve Actuator Stuck [08/2023 - ] >> Procedure

DTC P0EC9-71: A/C Low Pressure Magnetic Valve Actuator Stuck [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC (AIR CONDITIONING SYSTEM) 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      HINT: 

      Check even when the DTCs detected for temporary failures.

      Result

      Result Proceed to
      B1385-71 is not output A
      B1385-71 is output B
      Relevant DTC
      B1385-71 A/C Cooling Electric Expansion Valve Actuator Stuck

    Result: 

    GO TO DTC CHART (B1385-71). Refer to  DTC B1385-71: A/C Cooling Electric Expansion Valve Actuator Stuck [08/2023 - ] 

    Result: 

    See step  2

  2. CHECK DTC (HYBRID BATTERY CONTROL SYSTEM) 
    1. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      HINT: 

      Check even when the DTCs detected for temporary failures.

      Result

      Result Proceed to
      P1B83-1C is not output A
      P1B83-1C is output B
      Relevant DTC
      P1B83-1C Hybrid/EV Battery Pack Refrigerant Pressure Sensor "A" Circuit Range/Performance Circuit Voltage Out of Range

    Result: 

    GO TO DTC CHART (P1B83-1C). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

    Result: 

    See step  3

  3. INSPECT LOW PRESSURE MAGNETIC VALVE (NO. 1 MAGNET VALVE ASSEMBLY) 

    Refer to INSPECTION [08/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HEAT PUMP ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE LOW PRESSURE MAGNETIC VALVE (NO. 1 MAGNET VALVE ASSEMBLY). Refer to  REMOVAL [08/2023 - ]