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DTC P1235: High Pressure Fuel Pump Circuit: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUEL PUMP FOR HIGH PRESSURE 
    1. Disconnect the E41 fuel pump for high pressure connector.
      Fig 1: Identifying Connector Terminals
      GTY145010Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 1.19 to 1.39 Ω
    3. Reconnect the fuel pump for high pressure connector.

    NG → REPLACE FUEL PUMP FOR HIGH PRESSURE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - HIGH PRESSURE SIDE FUEL PUMP) 
    1. Disconnect the E58 injector driver (EDU) connector.
      Fig 2: Identifying Connector Terminals
      GTY145515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E41 high pressure side fuel pump connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      FP+ (E58-3) - E41-1 Below 1 Ω
      FP- (E58-4) - E41-2 Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      FP+ (E58-3) or E41-1 - Body ground 10 kΩ or higher
      FP- (E58-4) or E41-2 - Body ground 10 kΩ or higher
    4. Reconnect the injector driver (EDU) connector.
    5. Reconnect the high pressure side fuel pump connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT ECM (FPD AND FPF1 VOLTAGE) 
    1. Start the engine, and check the waveforms between terminals FPF1 and E1, and FPD and E1 of the E6 and E4 ECM connectors.
      Fig 3: Inspecting ECM (FPD And FPF1 Voltage)
      GTY145516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      The correct waveform is as shown in the illustration.

      ECM Terminal Name CH1: FPD (E6-33) - E1 (E4-7)
      CH2: FPF1 (E6-32) - E1 (E4-7)
      Tester Range 2 V/DIV.
      5 ms./DIV.
      Conditions Idling with warm engine

    OK → REPLACE ECM 

    NG: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - ECM) 
    1. Disconnect the E6 ECM connector.
      Fig 4: Identifying Connector Terminals
      GTY128156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E26 injector driver (EDU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      FPF1 (E6-32) - FPF1 (E26-7) Below 1 Ω
      FPD (E6-33) - FPD (E26-8) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      FPF1 (E6-32) or FPF1 (E26-7) - Body ground 10 kΩ or higher
      FPD (E6-33) or FPD (E26-8) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the injector driver (EDU) connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE INJECTOR DRIVER 

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