Nissan Leaf. Manual - part 1204

U1000 CAN COMM CIRCUIT

TMS-97

< DTC/CIRCUIT DIAGNOSIS >

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000010121007

CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent malfunction detection abil-

ity.Many electronic control units are equipped onto a vehicle, and each control unit shares information and

linkswith other control units during operation (not independently). In CAN communication, control units are

connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmis-

sion with less wiring. Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always power switch OFF and wait

at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1. Power switch ON and wait for 5 seconds or more.

2. Check DTC.
Is “U1000” detected?

YES

>> Go to 

TMS-97, "Diagnosis Procedure"

.

NO-1 >> To check malfunction symptom before repair: Refer to 

GI-53, "Intermittent Incident"

.

NO-2 >> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010121009

For the diagnosis procedure, refer to 

LAN-17, "Trouble Diagnosis Flow Chart"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

Malfunction detected condition

Possible causes

U1000

CAN COMM CIRCUIT
(CAN communication line)

If CAN communications signals continu-
ously for 2 seconds or more cannot be 
transmitted

Harness or connectors
(CAN communication line is open or short-
ed.)

TMS-98

< DTC/CIRCUIT DIAGNOSIS >

TRACTION MOTOR INSULATION RESISTANCE CHECK

TRACTION MOTOR INSULATION RESISTANCE CHECK

Component Inspection

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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.

• 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.

1.

PRECONDITIONING

WARNING:

Disconnect the high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

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

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. 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.

>> GO TO 2.

Standard

: 5 V or less 

JPCIA0296ZZ

TRACTION MOTOR INSULATION RESISTANCE CHECK

TMS-99

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2.

CHECK TRACTION MOTOR 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. Refer to 

TMS-109, "Removal and Installation"

.

2. Use 500V range of insulation resistance tester to measure insu-

lation 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.

NOTE:

As each bus bar (U-phase, V-phase, and W-phase) contacts to

each other inside the traction motor, check resistance of a

phase.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the traction motor. Refer to 

TMS-109, "Removal and Installation"

.

3-phase bus bar

Ground

Resistance

Terminal

U-phase

Traction motor case

10 M

Ω or more

V-phase

W-phase

JSCIA0668ZZ

TMS-100

< DTC/CIRCUIT DIAGNOSIS >

TRACTION MOTOR INVERTER INSULATION RESISTANCE CHECK

TRACTION MOTOR INVERTER INSULATION RESISTANCE CHECK

Component Inspection

INFOID:0000000010121011

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.

• 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.

1.

PRECONDITIONING

WARNING:

Disconnect the high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

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

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. 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.

>> GO TO 2.

Standard

: 5 V or less 

JPCIA0296ZZ