Lexus NX: Drive Motor Inverter Temperature Sensor "A" Circuit Low (P0AEF-275,P0AF0-274)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Drive Motor Inverter Temperature Sensor "A" Circuit Low (P0AEF-275,P0AF0-274)

DESCRIPTION

The MG ECU, which is built into in the inverter with converter assembly, detects the temperature of the motor inverter using a temperature sensor built into the inverter with converter assembly. The inverter cooling system operates independently of the engine cooling system. The MG ECU uses signals from the motor inverter temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the MG ECU will limit inverter output to help prevent inverter overheating. The MG ECU also detects malfunctions in the motor inverter temperature sensor and its wiring.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0AEF-275

Drive Motor Inverter Temperature Sensor "A" Circuit Low

Short to ground in the motor inverter temperature sensor circuit

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

P0AF0-274

Drive Motor Inverter Temperature Sensor "A" Circuit High

Open or short to +B in motor inverter temperature sensor circuit

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

Related Data List

DTC No.

Data List

P0AEF-275

Inverter Temp-(MG2)

P0AF0-274

MONITOR DESCRIPTION

If the MG ECU detects a malfunction in the motor inverter temperature sensor circuit, it outputs a malfunction signal to the hybrid vehicle control ECU.

Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0AEF (INF 275): Drive Motor "A" Inverter Temperature malfunction (GND short)

P0AF0 (INF 274): Drive Motor "A" Inverter Temperature malfunction (+B short and Disconnection)

Required sensors/components

Motor inverter temperature sensor

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 P0AEF (INF 275) is not detected

DTC P0AF0 (INF 274) 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 turn the Techstream on.
  6. With the shift lever in P, wait for 5 seconds or more.

    HINT:

    Check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

  7. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
  8. Read the current DTCs.

    HINT:

    • If a current DTC is output, the system is malfunctioning.
    • If a current DTC is not output and want to confirm permanent DTC, perform the following procedure.
  9. Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
  10. If the permanent DTCs are not cleared, perform a 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

NEXT

COMPLETED

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