Lexus NX: DC/DC Converter Voltage Sensor "A" Low (P0E33-589,P0E34-590)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / DC/DC Converter Voltage Sensor "A" Low (P0E33-589,P0E34-590)

DESCRIPTION

The MG ECU, which is built into the inverter with converter assembly, detects pre-boosting high voltage (VL) using the voltage sensor in the boost converter to control boosting. The MG ECU also monitors the boost converter voltage sensor signal line and detects malfunctions.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0E33-589

DC/DC Converter Voltage Sensor "A" Low

Boost converter voltage (VL) signal is stuck (Low)

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

P0E34-590

DC/DC Converter Voltage Sensor "A" High

Boost converter voltage (VL) signal is stuck (High)

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.

Data List

P0E33-589

VL-Voltage before Boosting

P0E34-590

MONITOR DESCRIPTION

The MG ECU monitors the boost converter voltage (VL) sensor circuit. If the MG ECU detects an open or short circuit malfunction of the VL sensor circuit, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0E33 (INF 589): VL malfunction (Disconnection and GND short)

P0E34 (INF 590): VL malfunction (+B short)

Required sensors/components

Boost converter

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P0E33 (INF 589) is not detected

DTC P0E34 (INF 590) is not detected

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 30 seconds or more.
  5. Turn the power switch on (IG) and after 5 seconds, turn the power switch off. [A]
  6. Repeat [A] 3 times. [B]
  7. Turn the power switch on (IG) and turn the Techstream on.
  8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
  9. Read the current DTCs.

    HINT:

    • If a current DTC is output, the system is malfunctioning.
    • If current DTCs are not output, perform the following steps to check for permanent DTCs.
  10. Check that the permanent DTCs are cleared.
  11. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

CAUTION / NOTICE / HINT

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Turn the power switch on (IG) and wait for 5 seconds or more.

PROCEDURE

1.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click here

HINT:

The boost converter voltage (VL) sensor is connected to the MG ECU inside the inverter with converter assembly. If P0E33-589 or P0E34-590 is output, replace the inverter with converter assembly.

NEXT

COMPLETED

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