Nissan Leaf. Manual - part 574

EVC-320

< DTC/CIRCUIT DIAGNOSIS >

P31D3 M/C RELAY

Check harness for short to power, between M/C relay harness connector and A/C relay harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK M/C RELAY DRIVE CIRCUIT

1. Disconnect VCM harness connector.

2. Check harness for short to ground, between M/C relay harness connector and VCM harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

5.

CHECK A/C RELAY DRIVE CIRCUIT

1. Disconnect VCM harness connector.

2. Check harness for short to power, between A/C relay harness connector and VCM harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace VCM. Refer to 

EVC-423, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Component Inspection (M/C Relay)

INFOID:0000000010120789

1.

CHECK M/C RELAY

1. Turn power switch OFF.

2. Disconnect M/C relay.

+

−

Voltage

M/C relay

Connector

Terminal

E65

5

Ground

0 V

+

−

Continuity

M/C relay

Connector

Terminal

E65

1

Ground

Not existed

+

−

Voltage

A/C relay

Connector

Terminal

E52

2

Ground

0 V

P31D3 M/C RELAY

EVC-321

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

3. Check the continuity between M/C relay terminals under the fol-

lowing conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace M/C relay.

Termi-

nals

Conditions

Continu-

ity

3 – 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not ex-

isted

PIIA2636J

EVC-322

< DTC/CIRCUIT DIAGNOSIS >

P31D4 PRE-CHARGE RELAY

P31D4 PRE-CHARGE RELAY

DTC Logic

INFOID:0000000010120790

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 

With CONSULT

1. Turn power switch ON and wait at least 10 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Proceed to 

EVC-322, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120791

1.

CHECK PRE-CHARGE RELAY GROUND CIRCUIT

1. Turn power switch OFF.

2. Disconnect Li-ion battery harness connector.

3. Check the continuity between Li-ion battery harness connector and ground.

Is inspection result normal?

YES

>> GO TO 2.

NO 

>> Repair or replace error-detected parts.

2.

CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-1

Check the resistance between Li-ion battery connector terminals.

Is the inspection result normal?

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P31D4

PRE CHARGE RELAY
(Pre-charge relay)

After operating the power switch from OFF to 
READY, a break occurs in the pre-charge relay 
drive circuit or resistance remains extremely high 
for 2.5 seconds or more. 

• Harness or connectors
• Li-ion battery J/B
• VCM

Li-ion battery

Ground

Continuity

Connector

Terminal

B24

10

Ground

Existed

Li-ion battery

Resistance

+

−

Terminal

10

11

Less than 5 k

Ω

P31D4 PRE-CHARGE RELAY

EVC-323

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

YES

>> GO TO 3.

NO

>> Check the relay circuit of Li-ion battery for malfunction. If no malfunction is found, replace battery

junction box. Refer to 

EVB-206, "BATTERY JUNCTION BOX AND BATTERY HARNESS : Disas-

sembly and Assembly"

.

3.

CHECK PRE-CHARGE RELAY DRIVE CIRCUIT-2

1. Disconnect VCM harness connector.

2. Check continuity between VCM harness connector and Li-ion battery harness connector.

3. Also check harness for short to power.
Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

+

−

Continuity

VCM

Li-ion battery

Connector

Terminal

Connector

Terminal

E61

40

B89

11

Existed