2015 Toyota Prius Plug-inFACTORY OEM SERVICE PROCEDURE

DTC U0293-449: Lost Communication with Hybrid Powertrain Control Module [08/2014 - ]: Procedure

  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: System Select / Health Check.
    4. Check if DTCs are output.

      Result

      Result Proceed to
      Only U0293-449 is output. A
      Only U0293-439 and U0293-449 are also output. B
      U0293-449 and any CAN communication system DTC other than U0293-439 are output. C
    5. Turn the power switch off.

    B → See step   7 

    C → See step   8 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - PLUGIN CHARGE CONTROL ECU ASSEMBLY) See step   2 

    NG → See step   5 

    OK: Go to next step 

  3. CHECK POWER MANAGEMENT CONTROL ECU (PIBM VOLTAGE) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY331112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      L135-10 (PIBM) - Body ground Power switch off 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Power Management Control ECU)

    NG → See step   6 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND). Refer to  PROCEDURE - Step 2 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - PLUGIN CHARGE CONTROL ECU ASSEMBLY) See step   6 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  6. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - PIMR RELAY) 
    1. Disconnect connector L135 from the power management control ECU.
    2. Remove the PIMR relay from the relay block assembly.
    3. Measure the resistance according to the value(s) in the table below.
      GTY331521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Relay Block Assembly (PIMR Relay) - -
      *a Rear view of wire harness connector
      (to Power Management Control ECU)      		 - -

      Standard Resistance (Check for Open)

      Tester Connection Switch Condition Specified Condition
      L135-10 (PIBM) - 5 (L) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Switch Condition Specified Condition
      L135-10 (PIBM) or 5 (L) - Body ground and other terminals Power switch off 10 kΩ or higher
    4. Install the PIMR relay.
    5. Connect the power management control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  7. GO TO DTC CHART (U0293-439). Refer to  DTC U0293-439: Lost Communication with Hybrid Powertrain Control Module [08/2014 - ]  
  8. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ] 
  9. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS [08/2014 - ] 
  10. REPLACE PLUGIN CHARGE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [08/2014 - ] 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.