Nissan Leaf. Manual - part 1205

TRACTION MOTOR INVERTER INSULATION RESISTANCE CHECK

TMS-101

< DTC/CIRCUIT DIAGNOSIS >

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CHECK TRACTION MOTOR INVERTER INSULATION RESISTANCE

WARNING:

Unlike the ordinary tester, the insulation resistance tester applies 500 V when measuring. If used

incorrectly, there is the danger of electric shock. If used in the vehicle 12V system, there is the danger

of damage to electronic devices. Read the insulation resistance tester instruction manual carefully

and be sure to work safely.

1. Remove the traction motor inverter. Refer to 

TMS-103, "Removal and Installation"

.

2. Use 500V range of insulation resistance tester to measure insulation resistance. Wait for 30 seconds until

the value becomes stable.

CAUTION:

Be sure to set the insulation resistance tester to 500 V when performing this test. Using a setting

higher than 500 V can result in damage to the component being inspected.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the traction motor inverter. Refer to 

TMS-103,

"Removal and Installation"

.

Traction motor inverter

Ground

Resistance

Item

Terminal

High voltage bus bar

50

Traction motor in-

verter case

14 M

Ω or more

51

3-phase bus bar

U-phase

V-phase

W-phase

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TMS-102

< SYMPTOM DIAGNOSIS >

ELECTROMAGNETIC SOUND IS AUDIBLE

SYMPTOM DIAGNOSIS

ELECTROMAGNETIC SOUND IS AUDIBLE

DESCRIPTION

INFOID:0000000010121012

The electromagnetic noise of the traction motor may become more noticeable when accelerating on a steep

slope (large output torque).

This occurs when the IGBT switching frequency is lowered by the traction motor inverter due to high tempera-

ture of the IGBT inside the traction motor inverter. This does not indicate a problem with the traction motor

inverter characteristics or control.

This phenomenon is one of the protective controls. Refer to 

TMS-27, "Protection Control"

.

TRACTION MOTOR INVERTER

TMS-103

< REMOVAL AND INSTALLATION >

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REMOVAL AND INSTALLATION

TRACTION MOTOR INVERTER

Exploded View

INFOID:0000000010121013

Removal and Installation

INFOID:0000000010121014

DANGER:

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of

electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are

handled incorrectly. Be sure to follow the correct work procedures when performing inspection and

maintenance.

WARNING:

• Be sure to remove the service plug in order to disconnect the high voltage circuits before perform-

ing inspection or maintenance of high voltage system harnesses and parts.

PDM (Power Delivery Module)

Traction motor inverter

Gasket

3-phase bus bar cover

High voltage warning label

Traction motor and reduction gear

Seal

Bracket

Sound insulating board

: Vehicle front

: Always replace after every disassembly.

: N·m (kg-m, ft-lb)

: Apply lithium-based grease including molybdenum disulphide.

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TMS-104

< REMOVAL AND INSTALLATION >

TRACTION MOTOR INVERTER

• The removed service plug must always be carried in a pocket of the responsible worker or placed in

the tool box during the procedure to prevent the plug from being connected by mistake.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

• Never allow workers other than the responsible person to touch the vehicle containing high voltage

parts. To keep others from touching the high voltage parts, these parts must be covered with an insu-

lating sheet except when using them.

• Refer to 

TMS-5, "High Voltage Precautions"

.

CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise

instructed in the Service Manual. A malfunction may occur if this is not observed.

REMOVAL

WARNING:

Disconnect the high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

1. Check voltage in high voltage circuit. (Check that condenser are discharged.)
a. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

b. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

c.

Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

2. Remove the PDM (Power Delivery Module). Refer to 

VC-112, "Removal and Installation"

.

3. Remove the water hose   between traction motor inverter and

traction motor.

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

Standard

: 5 V or less 

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