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DTC B2271: Ignition Hold Monitor Malfunction [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    GTY401165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H1 and H2 power management control ECU connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H1-1 (AM22) - Body ground Power switch off 11 to 14 V
      H2-7 (AM21) - Body ground Power switch off 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Power Management Control ECU)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (GROUND) 
    GTY417162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H1-5 (E01) - Body ground Always Below 1 Ω
      H1-6 (E1) - Body ground Always Below 1 Ω
      H2-4 (E12) - Body ground Always Below 1 Ω
      H2-5 (E02) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Power Management Control ECU)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK POWER MANAGEMENT CONTROL ECU 
    1. Reconnect the H1 and H2 power management control ECU connectors.
      GTY413037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-2 (IG2D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      H2-2 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      TEXT IN ILLUSTRATION

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

    NG → See step   4 

    OK → See step   5 

  4. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL [08/2013 - ] 
  5. END (USE SIMULATION METHOD TO CHECK). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - ] 
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