Nissan Leaf. Manual - part 580

EVC-344

< DTC/CIRCUIT DIAGNOSIS >

P31E0 HIGH VOLTAGE CIRCUIT INTERLOCK ERROR

P31E0 HIGH VOLTAGE CIRCUIT INTERLOCK ERROR

Description

INFOID:0000000010120808

The connection detecting circuit is used to detect the connection status of the PDM (Power Delivery Module)

cover and the bus bar cover of PDM (Power Delivery Module). 

The connection detecting circuit consists of two circuits (i.e. power supply circuit and signal input circuit).

When the PDM (Power Delivery Module) cover and the bus bar cover are installed normally, their protrusions

press the internal switch of PDM (Power Delivery Module). Accordingly, the connection detecting circuit is

energized and a voltage signal is input.

DTC Logic

INFOID:0000000010120809

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

With CONSULT

1. Turn power switch ON at least 5 seconds.

2. Check self-diagnostic result.
Is DTC detected?

YES

>> Proceed to 

EVC-344, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

1. Set the vehicle to READY at least 10 seconds.

2. Check self-diagnostic result.
Is DTC detected?

YES

>> Proceed to 

EVC-344, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120810

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.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P31E0

HV SYSTEM INTERLOCK 
ERROR
(High voltage system inter-
lock error)

VCM detects an excessively low voltage of the connection 
detecting circuit for 2.5 seconds during READY.

• Harness or connectors

(Connection detection circuit 
is open or shorted.)

• PDM (Power Delivery Mod-

ule)

VCM detects an excessively low voltage of the connection 
detecting circuit for 0.5 seconds during power switch ON.

P31E0 HIGH VOLTAGE CIRCUIT INTERLOCK ERROR

EVC-345

< DTC/CIRCUIT DIAGNOSIS >

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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.

• To prevent the removed service plug from being connected by mistake during the procedure, always

carry it in your pocket or put it in the tool box.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

• Clearly identify the persons responsible for high voltage work and ensure that other persons do not

touch the vehicle. When not working, cover high voltage parts with an insulating cover sheet or sim-

ilar item to prevent other persons from contacting them.

• Refer to 

EVC-10, "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.

• Erase DTC after the work is completed.

1.

OVERALL FUNCTION CHECK

With CONSULT

1. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “HV INTERLOCK (DC/DC)”.

2. Check that “On” is displayed.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> GO TO 2.

2.

PRECONDITIONING

WARNING:

Disconnect 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 3.

3.

CHECK CONNECTION DETECTING CIRCUIT POWER SUPPLY

Standard

: 5 V or less 

JPCIA0296ZZ

EVC-346

< DTC/CIRCUIT DIAGNOSIS >

P31E0 HIGH VOLTAGE CIRCUIT INTERLOCK ERROR

1. Disconnect PDM (Power Delivery Module) harness connector.

2. Reconnect 12V battery negative terminal.

3. Turn power switch ON.

4. Check the voltage between PDM (Power Delivery Module) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 4.

4.

CHECK CONNECTION DETECTING CIRCUIT POWER SUPPLY CIRCUIT

1. Turn power switch OFF.

2. Disconnect VCM harness connector.

3. Check the harness for short to power, between PDM (Power Delivery Module) harness connector and

VCM harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

Inspection result normal?

YES

>> Replace VCM. Refer to 

EVC-423, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK CONNECTION DETECTING CIRCUIT SIGNAL CIRCUIT

1. Turn power switch OFF.

2. Disconnect VCM harness connector.

3. Check the harness for short to power, between PDM (Power Delivery Module) harness connector and

VCM harness connector.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

Inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts.

8.

REPLACE VCM

+

−

Voltage

PDM (Power Delivery Module)

Connector

Terminal

F23

12

Ground

3 – 7 V

+

−

Voltage

PDM (Power Delivery Module)

Connector

Terminal

F23

12

Ground

0 V

+

−

Voltage

PDM (Power Delivery Module)

Connector

Terminal

F23

15

Ground

0 V

P31E0 HIGH VOLTAGE CIRCUIT INTERLOCK ERROR

EVC-347

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1. Replace VCM. Refer to 

EVC-423, "Removal and Installation"

.

2. Reconnect harness connector and parts disconnected.

3. Perform DTC Confirmation Procedure. Refer to 

EVC-146, "DTC Logic"

.

Is DTC P31E0 detected again?

YES

>> Replace PDM (Power Delivery Module). Refer to 

VC-112, "Removal and Installation"

.

NO

>> INSPECTION END