Lexus NX manuals

Lexus NX: All HV Gate Blocking Range/Performance (P321E-318)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / All HV Gate Blocking Range/Performance (P321E-318)

DESCRIPTION

The hybrid vehicle control ECU sends a block signal to the motor generator control ECU (MG ECU) to shutdown the power supply to the motor. When the system is not in the on (READY) state, it sends an HSDN (MG shutdown signal) signal from the hybrid vehicle control ECU to the motor generator control ECU (MG ECU) to check the function of the HV gate block. When a malfunction is detected in the HV gate block function, DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P321E-318

All HV Gate Blocking Range/Performance

An open or ground short in the HV gate block signal circuit when the gate is operating.

When the HV gate block function check is performed (when the power switch is turned from on (READY) to off), the inverter voltage (VH) drops and current flows in the inverter. (The generator (MG1), motor (MG2) and rear motor (MGR) are malfunctioning.)

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Inverter with converter assembly

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P321E-318
  • VH-Voltage after Boosting
  • Ready Signal
  • Emergency Shutdown

WIRING DIAGRAM

Refer to the wiring diagram for the shut down signal circuit.

Click here

CAUTION / NOTICE / HINT

CAUTION:

  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here

    HINT:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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HINT:

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

  1. Wait for 30 seconds or more with the vehicle stopped, the power switch on (READY) and the shift lever in P. Then turn the power switch off and wait for 60 seconds or more.

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

NG

CONNECT SECURELY
OK

2.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A61 hybrid vehicle control ECU connector.

(c) Disconnect the A58 inverter with converter assembly connector.

(d) Measure the resistance according to the value(s) in the table below.

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

*b

Front view of wire harness connector

(to Inverter with Converter Assembly)

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-12 (HSDN) or A58-40 (HSDN) - Body ground and other terminals

Power switch off

10 kΩ or higher

A61-12 (HSDN) - A58-40 (HSDN)

Power switch off

Below 1 Ω

(e) Reconnect the A58 inverter with converter assembly connector.

(f) Reconnect the A61 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK INVERTER WITH CONVERTER ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A58 inverter with converter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A58-40 (HSDN) - A58-10 (GND1)

Power switch off

2.65 to 3.55 kΩ

*a

Component without harness connected

(Inverter with Converter Assembly)

(d) Reconnect the A58 inverter with converter assembly connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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