Nissan Leaf. Manual - part 532

EVC-152

< DTC/CIRCUIT DIAGNOSIS >

P0A8E 12V BATTERY POWER SUPPLY

P0A8E 12V BATTERY POWER SUPPLY

DTC Logic

INFOID:0000000010120617

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. Set the vehicle to READY and wait at least 30 seconds.

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

YES

>> Proceed to 

EVC-152, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120618

1.

CHECK 12V BATTERY

Check that the correct 12V battery is installed.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace 12V battery with a correct one.

2.

CHECK SELF-DIAGNOSTIC RESULT IN PDM (POWER DELIVERY MODULE)

With CONSULT

Check self-diagnostic result in “CHARGER/PD MODULE”.
Is any DTC detected?

YES

>> Perform trouble diagnosis for detected DTC. Refer to 

VC-34, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK SELF-DIAGNOSTIC RESULT IN VCM

With CONSULT

Check self-diagnostic result in “EV/HEV”.
Is DTC (excluding P0A8E) related to DC/DC converter detected?

YES

>> Perform trouble diagnosis for detected DTC. Refer to 

EVC-102, "DTC Index"

.

NO

>> GO TO 4.

4.

CHECK DC/DC CONVERTER POWER VOLTAGE VARIABLE CONTROL SIGNAL

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0A8E

14V POWER SUPPLY
(14 V power module system 
voltage high)

VCM detects that a voltage of 12V battery power sup-
ply remains more than 16 V for 25.5 seconds during 
READY state.

• 12V battery
• Harness or connectors

(The signal circuit is open or 
shorted.)

• DC/DC converter
• VCM

P0A8E 12V BATTERY POWER SUPPLY

EVC-153

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

With CONSULT

1. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “DC/DC CONV REQ VOLT”. 

2. Check that the value of “DC/DC CONV REQ VOLT” is less than 16 V.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Replace VCM. Refer to 

EVC-423, "Removal and Installation"

.

EVC-154

< DTC/CIRCUIT DIAGNOSIS >

P0A8F 12V BATTERY POWER SUPPLY

P0A8F 12V BATTERY POWER SUPPLY

DTC Logic

INFOID:0000000010120619

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. Under the following conditions, and wait at least 30 seconds.

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

YES

>> Proceed to 

EVC-154, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120620

1.

INTERVIEW THE CUSTOMER

Interview the customer to see if there is a history that all of the following conditions are satisfied for a long

time.

NOTE:

This DTC may be detected if the above state continues for a long time.
Is the inspection result normal?

YES

>> Explain the customer that this is the normal operation.

NO

>> GO TO 2.

2.

CHECK SELF-DIAGNOSTIC RESULT IN PDM (POWER DELIVERY MODULE)

With CONSULT

Check self-diagnostic result in “CHARGER/PD MODULE”.
Is any DTC detected?

YES

>> Perform trouble diagnosis for detected DTC. Refer to 

VC-34, "DTC Index"

.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0A8F

14V POWER SUPPLY
(14 V power module system 
performance)

When shift is except P range, VCM detects 
that a voltage of 12V battery power supply 
remains less than 12 V for 10 seconds.

• Harness or connectors

(The sensor circuit is open or shorted.)

• DC/DC converter
• IPDM E/R

Power switch

READY

Shift position

Except P range

Power switch

ON

Shift position

Except P range

P0A8F 12V BATTERY POWER SUPPLY

EVC-155

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

EVC

N

O

P

NO

>> GO TO 3.

3.

CHECK SELF-DIAGNOSTIC RESULT IN VCM

With CONSULT

Check self-diagnostic result in “EV/HEV”.
Is any DTC that related DC/DC converter other than P0A8F detected?

YES

>> Perform trouble diagnosis for detected DTC. Refer to 

EVC-102, "DTC Index"

.

NO

>> GO TO 4.

4.

CHECK 12V BATTERY POWER SUPPLY

1. Turn power switch OFF.

2. Check the voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 5.

5.

CHECK FUSE

1. Pull out #43 fuse.

2. Check the fuse is not fusing.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace the fuse after repairing the applicable circuit.

6.

CHECK IPDM E/R

1. Insert the fuse which pulled out.

2. Remove IPDM E/R.

3. Check the continuity between IPDM E/R connector terminals.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and Installation"

.

7.

CHECK 12V BATTERY POWER SUPPLY CIRCUIT

1. Disconnect VCM harness connector.

2. Check the continuity between IPDM E/R harness connector and VCM harness connector.

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

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

+

−

Voltage

IPDM E/R

Connector

Terminal

E14

42

Ground

12V battery volt-

age

IPDM E/R

Continuity

+

−

Terminal

2

42

Existed

+

−

Continuity

IPDM E/R

VCM

Connector

Terminal

Connector

Terminal

E14

42

E61

11

Existed