Nissan Leaf. Manual — part 935

LAN-202

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

EV SYSTEM CAN CIRCUIT

EV SYSTEM CAN CIRCUIT

Diagnosis Procedure

INFOID:0000000010415454

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.

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.

2.

CONNECTOR INSPECTION

Standard

: 5 V or less

JPCIA0296ZZ

LAN

EV SYSTEM CAN CIRCUIT

LAN-203

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

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1. Turn the power switch OFF.

2. Disconnect the 12V battery cable from the negative terminal. Refer to

LAN-26, "Precautions for Removing

Battery Terminal"

.

3. Disconnect all the control unit connectors on EV system CAN circuit. For the removal of Li-ion battery con-

troller, refer to

EVB-201, "LI-ION BATTERY CONTROLLER : Removal and Installation"

.

4. Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the terminal and connector.

3.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector terminals.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check the harness and repair the root cause.

4.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector and the ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check the harness and repair the root cause.

5.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the vehicle communication harness connector terminals. Refer to

EVB-27, "Cir-

cuit Diagram"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair the vehicle communication harness.

6.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the vehicle communication harness connector and the ground. Refer to

EVB-27,

"Circuit Diagram"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair the vehicle communication harness.

Data link connector

Continuity

Connector No.

Terminal No.

M4

13

12

Not existed

Data link connector

Ground

Continuity

Connector No.

Terminal No.

M4

13

Not existed

12

Not existed

Vehicle communication harness (LB1)

Continuity

Terminal No.

1

2

Not existed

Vehicle communication harness (LB1)

Ground

Continuity

Terminal No.

1

Not existed

2

Not existed

LAN-204

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

EV SYSTEM CAN CIRCUIT

7.

CHECK VCM AND LI-ION BATTERY CONTROLLER TERMINATION CIRCUIT

1. Remove the VCM.

2. Check the resistance between the VCM terminals.

3. Remove the Li-ion battery controller. Refer to

EVB-201, "LI-ION BATTERY CONTROLLER : Removal and

Installation"

.

4. Check the resistance between the Li-ion battery controller terminals.

Is the measurement value within the specification?

YES

>> GO TO 8.

NO

>> Replace the VCM and/or the Li-ion battery controller.

8.

CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with

customer)” are reproduced.
Inspection result

Reproduced>>GO TO 9.

Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is

detected.

9.

CHECK CONTROL UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each control unit.

1. Turn the power switch OFF.

2. Disconnect the 12V battery cable from the negative terminal. Refer to

LAN-26, "Precautions for Removing

Battery Terminal"

.

3. Disconnect one of the control unit connectors of EV system CAN circuit.

WARNING:

Disconnect the high voltage when disconnecting the Li-ion battery connector (B24). Refer to

GI-

33, "How to Disconnect High Voltage"

.

NOTE:

VCM and Li-ion battery controller have a termination circuit. Check other control units first.

4. Connect the 12V battery cable to the negative terminal. Check if the symptoms described in the “Symp-

tom (Results from interview with customer)” are reproduced.

NOTE:

Although control unit-related error symptoms occur, do not confuse them with other symptoms.

Inspection result

Reproduced>>Connect the connector. Check other control units as per the above procedure.

Non-reproduced>>Replace the control unit whose connector was disconnected.

VCM

Resistance (

Ω)

Terminal No.

24

25

Approx. 108 – 132

Li-ion battery controller

Resistance (

Ω)

Terminal No.

1

13

Approx. 108 – 132

MA-1

MAINTENANCE

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CONTENTS

MAINTENANCE

PRECAUTION . . . . . . . . . . . ...

3

PRECAUTIONS . . . . . . . . . . . . ...

3

Precaution for Technicians Using Medical Electric

. ..

3

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . . ...

3

High Voltage Precautions . . . . . . . . . . ..

4

PREPARATION . . . . . . . . . . .

6

PREPARATION . . . . . . . . . . . . ...

6

Commercial Service Tool . . . . . . . . . . ..

6

PERIODIC MAINTENANCE . . . . . . ..

7

GENERAL MAINTENANCE . . . . . . . .

7

FOR USA AND CANADA . . . . . . . . . . ....

7

FOR USA AND CANADA : Explanation of General
Maintenance . . . . . . . . . . . . . . . ..

7

FOR MEXICO . . . . . . . . . . . . . . . ..

8

FOR MEXICO : General Maintenance . . . . . ..

8

PERIODIC MAINTENANCE . . . . . . . ...

11

FOR USA AND CANADA . . . . . . . . . . ..

11

FOR USA AND CANADA : Introduction of Periodic
Maintenance . . . . . . . . . . . . . . .

11

FOR USA AND CANADA : Schedule 1 . . . . ...

11

FOR USA AND CANADA : Schedule 2 . . . . ...

12

FOR MEXICO . . . . . . . . . . . . . . .

13

FOR MEXICO : Periodic Maintenance . . . . .

13

RECOMMENDED FLUIDS AND LUBRI-
CANTS . . . . . . . . . . . . . . . .

16

FOR USA AND CANADA . . . . . . . . . . ..

16

FOR USA AND CANADA : Fluids and Lubricants .

16

FOR USA AND CANADA : Anti-Freeze Coolant
Mixture Ratio . . . . . . . . . . . . . . ...

16

FOR MEXICO . . . . . . . . . . . . . . . .

17

FOR MEXICO : Fluids and Lubricants . . . . . .

17

FOR MEXICO : Coolant Mixture Ratio . . . . .

17

EV SYSTEM MAINTENANCE . . . . . . ...

18

COOLANT . . . . . . . . . . . . . . . . ..

18

COOLANT : Inspection . . . . . . . . . . .

18

COOLANT : Draining . . . . . . . . . . . ...

18

COOLANT : Refilling . . . . . . . . . . . ...

19

RESERVOIR TANK CAP . . . . . . . . . . ...

19

RESERVOIR TANK CAP : Inspection . . . . . .

20

CHARGE PORT . . . . . . . . . . . . . . .

20

CHARGE PORT : Inspection . . . . . . . . ...

20

CHASSIS MAINTENANCE . . . . . . . ...

23

REDUCTION GEAR OIL . . . . . . . . . . .

23

REDUCTION GEAR OIL : Inspection . . . . . ..

23

REDUCTION GEAR OIL : Draining and Refilling .

23

WHEELS . . . . . . . . . . . . . . . . .

23

WHEELS : Inspection . . . . . . . . . . . ..

24

WHEELS : Wheel Balance Adjustment . . . . ...

24

WHEELS : Tire Rotation . . . . . . . . . . ..

25

BRAKE FLUID LEVEL AND LEAKS . . . . . . .

25

BRAKE FLUID LEVEL AND LEAKS : Inspection .

26

BRAKE LINES AND CABLES . . . . . . . . ...

26

BRAKE LINES AND CABLES : Inspection . . . ..

26

BRAKE FLUID . . . . . . . . . . . . . . ...

26

BRAKE FLUID : Changing . . . . . . . . . ...

26

DISC BRAKE . . . . . . . . . . . . . . . .

26

DISC BRAKE : Inspection . . . . . . . . . ...

26

DISC BRAKE : Front Disc Brake . . . . . . . .

27

DISC BRAKE : Rear Disc Brake . . . . . . . ..

27

STEERING GEAR AND LINKAGE . . . . . . .

27

STEERING GEAR AND LINKAGE : Inspection . ..

27