Nissan Leaf. Manual — part 934
LAN-198
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
HV BAT BRANCH LINE CIRCUIT
HV BAT BRANCH LINE CIRCUIT
Diagnosis Procedure
INFOID:0000000010415452
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.
CHECK CONNECTOR
1. Turn the power switch OFF.
2. Disconnect the 12V battery cable from the negative terminal. Refer to
LAN-26, "Precautions for Removing
3. Check the terminals and connectors of the Li-ion battery for damage, bend and loose connection (unit
side and connector side).
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the terminal and connector.
2.
CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of Li-ion battery.
2. Check the resistance between the Li-ion battery harness connector terminals.
Is the measurement value within the specification?
YES
>> GO TO 3.
NO
>> Repair the Li-ion battery branch line.
3.
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
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"
.
Li-ion battery harness connector
Resistance (
Ω)
Connector No.
Terminal No.
B24
1
2
Approx. 108 – 132
LAN
HV BAT BRANCH LINE CIRCUIT
LAN-199
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
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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 4.
4.
CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the Li-ion battery controller. Refer to
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair the power supply and the ground circuit.
5.
CHECK HARNESS FOR OPEN CIRCUIT
1. Remove Li-ion battery controller. Refer to
EVB-201, "LI-ION BATTERY CONTROLLER : Removal and
.
2. Check the continuity between vehicle communication harness (harness between Li-ion battery harness
connector side and Li-ion battery controller side) connector terminals. Refer to
.
Is the measurement value within the specification?
YES (Present error)>>Replace the Li-ion battery controller. Refer to
TROLLER : Removal and Installation"
YES (Past error)>>Error was detected in the Li-ion battery controller branch line.
NO
>> Repair the vehicle communication harness.
Standard
: 5 V or less
JPCIA0296ZZ
Vehicle communication harness
Continuity
Li-ion battery harness connector side (LB1)
Li-ion battery controller side (LB11)
Terminal No.
Terminal No.
1
1
Existed
2
13
Existed
LAN-200
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
CAN COMMUNICATION CIRCUIT
CAN COMMUNICATION CIRCUIT
Diagnosis Procedure
INFOID:0000000010415453
1.
CONNECTOR INSPECTION
1. Turn the power switch OFF.
2. Disconnect the 12V battery cable from the negative terminal. Refer to
LAN-26, "Precautions for Removing
3. Disconnect all the control unit connectors on CAN communication circuit.
4. Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the terminal and connector.
2.
CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check the harness and repair the root cause.
3.
CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector and the ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Check the harness and repair the root cause.
4.
CHECK VCM AND BCM TERMINATION CIRCUIT
1. Remove the VCM and the BCM.
2. Check the resistance between the VCM terminals.
3. Check the resistance between the BCM terminals.
Is the measurement value within the specification?
YES
>> GO TO 5.
NO
>> Replace the VCM and/or the BCM.
5.
CHECK SYMPTOM
Data link connector
Continuity
Connector No.
Terminal No.
M4
6
14
Not existed
Data link connector
Ground
Continuity
Connector No.
Terminal No.
M4
6
Not existed
14
Not existed
VCM
Resistance (
Ω)
Terminal No.
75
76
Approx. 108 – 132
BCM
Resistance (
Ω)
Terminal No.
39
40
Approx. 108 – 132
LAN
CAN COMMUNICATION CIRCUIT
LAN-201
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
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Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with
customer)” are reproduced.
Inspection result
Reproduced>>GO TO 6.
Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is
detected.
6.
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
3. Disconnect one of the control unit connectors of CAN communication circuit.
NOTE:
VCM and BCM 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.
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