Nissan Altima HL32 Hybrid. Manual - part 548

P0A84-123

HBB-49

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBB

N

O

P

2. Measure the resistance according to the value(s) in the table below.

NOTE:

When taking measurements with an electrical tester, do not apply excessive force to the tester probes to

avoid damaging the fuse holder or terminals.

3. Turn ignition switch ON.

4. Measure the voltage according to the value(s) in the table below.

NOTE:

When taking measurements with an electrical tester, do not apply excessive force to the tester probes to

avoid damaging the fuse holder or terminals.

OK or NG

OK

>> GO TO 12.

NG

>> Repair or replace harness or connector.

12.

CHECK HARNESS AND CONNECTOR (HV BATTERY FAN RELAY - BATTERY COOLING BLOWER)

Measure the resistance according to the value(s) in the table below.

NOTE:

When taking measurements with an electrical tester, do not apply excessive force to the tester probes to avoid

damaging the fuse holder or terminals.
OK or NG

OK

>> Repair or replace harness or connector.

NG

>> Replace the hybrid vehicle control ECU (Refer to 

HBC-644, "Removal and Installation"

).

13.

CHECK WAVEFORM

1. Install the 15A fuse to the high voltage fuse and fusible link box.

2. Connect the battery cooling blower assembly connector.

3. Connect an oscilloscope between connector terminals 3 (SI0) and 4 (GNDO) of the battery cooling blower

assembly.

4. Turn ignition switch ON.

5. Select “COOLING FAN SPD” in “ACTINE TEST” mode with CONSULT-III.

6. Select air volume mode 1 to 6 in “COOLING FAN SPD” to operate the battery cooling blower assembly.

high voltage fuse and fusible link box

Hybrid vehicle control ECU

Resistance

Connector

Terminal

Connector

Terminal

HV battery fan relay

2

E66

186 (FCTL)

Below 1 

Ω

high voltage fuse and fusible link box

Ground

Voltage

Connector

Terminal

HV battery fan relay

2

Ground

Below 1 V

Hybrid vehicle control ECU

Ground

Voltage

Connector

Terminal

E66

186 (FCTL)

Ground

Below 1 V

HV battery fan relay

Battery cooling blower 

assembly

Resistance

Connector

Terminal

Connector

Terminal

B111

5

B128

1 (IGO)

Below 1 

Ω

HBB-50

< COMPONENT DIAGNOSIS >

P0A84-123

7. Measure the waveform.

NOTE:

• A and B in the DUTY waveform shown in the illustration vary

depending on the cooling fan mode.

• The actual duty command value is influenced by variance in

fan motors and the change of power supply voltage.

OK or NG

OK

>> Replace battery cooling blower assembly (Refer to 

HBB-106, "Removal and Installation"

).

NG

>> GO TO 14.

14.

CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER - HYBRID VEHICLE CONTROL

ECU)
1. Turn ignition switch OFF.

2. Disconnect the battery cooling blower assembly connector.

3. Disconnect the hybrid vehicle control ECU harness connector E66.

4. Measure the resistance according to the value(s) in the table below.

OK or NG

OK

>> Replace the hybrid vehicle control ECU (Refer to 

HBC-644, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

15.

CHECK BATTERY COOLING BLOWER ASSEMBLY (VOLTAGE)

1. Turn ignition switch ON.

2. Select “COOLING FAN SPD” in “ACTIVE TEST” mode with CONSULT-III.

NOTE:

JMCIA0252ZZ

Item

Contents

Cooling blower assembly terminal (A)

3 (SIO) and 4 (GNDO) 

Equipment Setting

1 V/DIV., 500 us/DIV.

Condition

Ignition switch ON or READY

JMCIA0088GB

Battery cooling blower 

assembly

Hybrid vehicle control ECU

Resistance

Connector

Terminal

Connector

Terminal

B128

3 (SIO)

E66

105 (SIO)

Below 1 

Ω

Battery cooling blower assembly

Ground

Resistance

Connector

Terminal

B128

3 (SIO)

Ground

10 k

Ω or higher

Hybrid vehicle control ECU

Ground

Resistance

Connector

Terminal

E66

105 (SIO)

Ground

10 k

Ω or higher

P0A84-123

HBB-51

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBB

N

O

P

Check “COOLING FAN 1” in the “DATA MODE” using the CONSULT-III. If the “COOLING FAN 1” is 1 to 6,

it is not necessary to perform the “ACTIVE TEST”.

3. Select each air volume mode (1 to 6) in “COOLING FAN SPD” to operate the battery cooling blower

assembly.

4. While the cooling fan is operating, compare the value indicated by “VMF FAN VOLT 1” with the voltage

value that was actually measured at the battery cooling blower assembly connector.

OK or NG

OK

>> GO TO 16.

NG

>> Replace battery cooling blower assembly (Refer to 

HBB-106, "Removal and Installation"

).

16.

CHECK AND CONNECTOR (BATTERY COOLING BLOWER - BATTERY SMART UNIT)

CAUTION:

Be sure to wear insulated gloves.

1. Remove the service plug grip (Refer to 

GI-24, "Precautions For High-Voltage System"

).

2. Remove the battery smart unit (Refer to 

HBB-101, "Removal and Installation"

).

3. Disconnect the battery smart unit harness connector B130.

4. Measure the resistance according to the value(s) in the table below.

Check for open

Check for short

OK or NG

OK

>> Replace battery smart unit (Refer to 

HBB-101, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

Battery cooling blower 

assembly

Battery cooling blower 

assembly

Condition

Connector

Terminal

Connector

Terminal

B128

2 (VMO)

B128

4 (GNDO)

There is no difference between the value indicated by “VMF FAN 
VOLT 1” and the voltage value that was actually measured at the 
battery cooling blower assembly connector.

Difference of voltage is 1 V or less

Battery cooling blower 

assembly

Battery smart unit

Resistance

Connector

Terminal

Connector

Terminal

B128

2 (VMO)

B130

9 (VM)

Below 1 

Ω

Battery cooling blower assembly

Ground

Resistance

Connector

Terminal

B128

2 (VMO)

Ground

10 k

Ω or higher

Battery smart unit

Ground

Resistance

Connector

Terminal

B130

9 (VM)

Ground

10 k

Ω or higher

HBB-52

< COMPONENT DIAGNOSIS >

P0A85-123

P0A85-123

Description

INFOID:0000000004212264

The speed of the battery cooling blower assembly is controlled by the hybrid vehicle control ECU. Battery

cooling blower assembly power is supplied when the FCTL terminal of the hybrid vehicle control ECU turns

ON the battery blower relay. The hybrid vehicle control ECU sends command signals (SI) to the battery cool-

ing blower assembly to get the fan speed corresponding to the HV battery temperature.

Information about the voltage applied to the battery cooling blower assembly (VM) is sent to the hybrid vehicle

control ECU as a monitor signal using serial communication via the battery smart unit.

DTC Logic

INFOID:0000000004212265

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000004212266

1.

PRECONDITIONING

• Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and

removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your

pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-volt-

age system.

• After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage

connectors or terminals.

• Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with

converter assembly.

>> GO TO 2.

2.

CHECK FOR DTC (DTC P0A1F-123 IS OUTPUT)

1. Turn ignition switch ON.

2. Check DTC.
Is DTC P0A1F-123 detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 3.

JMCIA0087GB

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A85

123

Hybrid battery pack cooling 
fan 1

When the output voltage of the battery 
cooling blower assembly (VM) is too high 
compared to the target control voltage 
range (1 trip detection)

• Wire harness or connector
• Battery cooling blower assembly
• Battery smart unit
• HV  battery