Lexus NX: Motor Electronics Coolant Temperature Sensor Circuit Low (P0A02-719,P0A03-720)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Motor Electronics Coolant Temperature Sensor Circuit Low (P0A02-719,P0A03-720)

DESCRIPTION

Refer to the description for DTC P0A01-726.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A02-719

Motor Electronics Coolant Temperature Sensor Circuit Low

Short to ground in the HV coolant temperature sensor circuit

(1 trip detection logic)

Inverter with converter assembly

Comes on

Master Warning Light:

Comes on

P0A03-720

Motor Electronics Coolant Temperature Sensor Circuit High

Open or short to +B in the HV coolant 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

P0A02-719

Inverter Coolant Water Temperature

P0A03-720

MONITOR DESCRIPTION

If the MG ECU detects a malfunction in the HV coolant 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

P0A02 (INF 719): Motor Electronics Coolant Temperature malfunction (GND short)

P0A03 (INF 720): Motor Electronics Coolant Temperature malfunction (+B short and Disconnection)

Required sensors/components

HV coolant 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 P0A02 (INF 719) is not detected

DTC P0A03 (INF 720) 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. If "Inverter Coolant Water Temperature" does not show an abnormal value (110°C (230°F) or -50°C (-58°F)) when the power switch is turned on (IG), the condition is judged as normal.

(If a Low malfunction exists in the HV coolant temperature sensor wiring, 110°C (230°F) is displayed and if a High malfunction exists, -50°C (-58°F) is displayed.)

PROCEDURE

1.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click here

NEXT

COMPLETED

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 Disassembly

DISASSEMBLY PROCEDURE 1. REMOVE NO. 1 HEATER TO REGISTER DUCT SUB-ASSEMBLY (a) Remove the 3 screws <A> or <B> and No. 1 heater to register duct sub-assembly. *a Screw <A> or <B> 2. REMOVE NO. 2 HEATER TO REGISTER DUCT SUB-ASSEMBLY (a) Remove the

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