Nissan Leaf. Manual — part 579
EVC-340
< DTC/CIRCUIT DIAGNOSIS >
P31DC SYSTEM MAIN RELAY -
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
NO
>> Repair or replace error-detected parts.
P31DD PRE-CHARGE RELAY
EVC-341
< DTC/CIRCUIT DIAGNOSIS >
D
E
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A
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EVC
N
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P31DD PRE-CHARGE RELAY
DTC Logic
INFOID:0000000010120804
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
• Turn power switch OFF and wait at least 90 seconds.
CAUTION:
During this period, never perform vehicle handling such as opening and closing of doors. If some
kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the
vehicle handling.
• Make sure that 12V battery voltage is 11 V or more.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Set the vehicle to READY and wait at least 5 seconds.
2. Check DTC.
Is DTC detected?
YES
>> Proceed to
EVC-341, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010120805
1.
CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-1
1. Turn power switch OFF.
2. Disconnect Li-ion battery harness connector.
3. Check continuity between Li-ion battery connector terminal and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check short circuit between Li-ion battery harness and ground.
2.
CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-2
1. Disconnect VCM harness connector.
2. Check harness for short to ground, between VCM harness connector and Li-ion battery harness connec-
tor.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P31DD
PRE CHARGE RELAY
(Pre-charge relay)
Pre-charge relay drive circuit remains short to ground for
2.5 seconds or more.
• Harness or connectors
(Pre-charge relay drive cir-
cuit is shorted)
• Pre-charge relay
+
−
Continuity
Li-ion battery
Terminal
11
Ground
Not existed
EVC-342
< DTC/CIRCUIT DIAGNOSIS >
P31DD PRE-CHARGE RELAY
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
NO
>> Repair or replace error-detected parts.
+
−
Continuity
Li-ion battery
Connector
Terminal
B89
11
Ground
Not existed
P31DE SYSTEM MAIN RELAY
EVC-343
< DTC/CIRCUIT DIAGNOSIS >
D
E
F
G
H
I
J
K
L
M
A
B
EVC
N
O
P
P31DE SYSTEM MAIN RELAY
DTC Logic
INFOID:0000000010120806
DTC DETECTION LOGIC
NOTE:
This DTC shows a forced system main relay disconnection by fail-safe.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
• Turn power switch OFF and wait at least 90 seconds.
CAUTION:
During this period, never perform vehicle handling such as opening and closing of doors. If some
kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the
vehicle handling.
• Make sure that 12V battery voltage is 11 V or more.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn power switch ON and wait at least 10 seconds.
2. Check DTC.
Is DTC detected?
YES
>> Proceed to
EVC-343, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010120807
1.
PERFORM SELF-DIAGNOSIS OF VCM
With CONSULT
Perform self-diagnosis of VCM.
Is DTC detected other than P31DE?
YES
>> Perform diagnosis procedure of detected DTC and then replace battery J/B. Refer to
"BATTERY JUNCTION BOX AND BATTERY HARNESS : Disassembly and Assembly"
NO
>> Replace Li-ion battery J/B. Refer to
EVB-206, "BATTERY JUNCTION BOX AND BATTERY HAR-
NESS : Disassembly and Assembly"
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P31DE
HV BATT MAIN RELAY
(High voltage battery main re-
lay)
When the system main relay is shut off, VCM accumulates high
voltage current value, and the accumulated value reaches the
specified value.
• Li-ion battery J/B
• EV control system
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