Nissan Altima HL32 Hybrid. Manual - part 668

P0AA6-526, P0AA6-611, P0AA6-612, P0AA6-613, P0AA6-614

HBC-421

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

NOTE:

•  *1: INF code 526 is stored together with P0AA6.

• *2: On a trip after INF code 526 is stored, these INF codes are stored if the malfunctioning area is deter-

mined.

• If P0AA6 is output, the vehicle cannot start until the DTC is cleared using CONSULT-III.

• If P0AA6 is output while driving, the vehicle can drive for the remainder of that trip.

Diagnosis Procedure

INFOID:0000000004212052

1.

PRECONDITIONING

• When troubleshooting P0AA6, be sure to wrap the tools with insulating tape. (It will be very dangerous if high

voltage is shorted to ground through the tools.)

• Turn ignition switch OFF before inspecting the high-voltage system. Take safety precautions such as wear-

ing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the ser-

vice plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you

are working on the high-voltage 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 DTC OUTPUT (HYBRID SYSTEM)

1. Turn ignition switch ON.

2. Check DTC.

NOTE:

Do not remove the service plug grip.

DTC No.

INF ode

Trouble diagnosis name

DTC detecting condition

Possible cause

P0AA6 

526  (*1)

Hybrid Battery Voltage System 
Isolation Fault

Insulation resistance between 
the high-voltage circuit and the 
body has decreased.

• Hybrid transaxle
• Inverter with converter assembly
•  Frame wire
• Air conditioning harness assem-

bly

• HV relay assembly
• Compressor with motor assembly
• HV battery
• Battery smart unit
• Hybrid vehicle converter (DC/DC 

converter)

P0AA6

611(*2)

Hybrid Battery Voltage System 
Isolation Fault

Insulation resistance of the com-
pressor with motor assembly has 
decreased.

Compressor with motor assembly

P0AA6

612 (*2)

Hybrid Battery Voltage System 
Isolation Fault

Insulation resistance of the HV 
battery area is decreased.

• HV relay assembly
• Battery smart unit
• HV battery
• Hybrid vehicle converter (DC/DC 

converter)

P0AA6 613 

(*2)

Hybrid Battery Voltage System 
Isolation Fault

Insulation resistance of the hy-
brid transaxle area is decreased.

• Hybrid transaxle
• Inverter with converter assembly 

P0AA6

614(*2)

Hybrid Battery Voltage System 
Isolation Fault

Insulation resistance of the high-
voltage DC area has decreased.

• Inverter with converter assembly
• Floor  wire
• Compressor with motor assembly
• Air conditioning harness assem-

bly

• HV relay assembly
• Hybrid vehicle converter (DC/DC 

converter)

HBC-422

< COMPONENT DIAGNOSIS >

P0AA6-526, P0AA6-611, P0AA6-612, P0AA6-613, P0AA6-614

A, B, C or D

A

>> GO  TO  3.

B

>> Go to Diagnosis Procedure relevant to output DTC (P0A1D).

C

>> Go to Diagnosis Procedure relevant to output DTC (P0AA7-727).

D

>> Replace battery smart unit (See 

HBB-101, "Removal and Installation"

).

3.

CHECK INFO CODE

1. Turn ignition switch ON.

2. Check DTC.

3. Access the freeze frame data of DTC P0AA6 and read the INF code.

NOTE:

INF codes 611, 612, 613, and 614 are not stored at the same time with 526. If INF code 526 only is

output, turn ignition switch OFF and wait 30 seconds to determine the malfunctioning area. Then,

read the INF code again.

A, B, C or D

A

>> GO  TO  4.

B

>> Go to air conditioning system.

C

>> GO TO 10.

D

>> GO TO 18.

E

>> GO TO 13.

4.

CHECK AIR CONDITIONING HARNESS ASSEMBLY

CAUTION:

Be sure to wear insulated gloves.

1. Turn ignition switch OFF and remove the service plug grip (See 

HBC-632, "Precautions for Inspecting the

Hybrid Control System"

).

NOTE:

After removing the service plug grip, do not turn ignition switch ON (READY), unless instructed by

the repair manual because this may cause a malfunction.

2. Disconnect the air conditioning harness assembly from the

inverter with converter assembly.

Output DTC

Proceed to

Only P0AA6 is output. 

A

P0AA6 and P0A1D (Hybrid vehicle control ECU malfunction) are output.

B

P0AA6 and P0AA7-727 (Malfunction in the battery smart unit) are output.

C

P0AA6 and P0A1F (Battery smart unit malfunction) are output.

D

Output INF

Proceed to

526 (decrease in the insulation resistance of the high-voltage circuit) only is output. 

A

526 and 611 (decrease in the insulation resistance of the air conditioner area) are output.

B

526 and 612 (decrease in the insulation resistance of the HV battery area) are output. 

C

526 and 613 (decrease in the insulation resistance of the hybrid transaxle area) are output. 

D

526 and 614 (decrease in the insulation resistance of the high-voltage DC area) are output.

E

ALCIA0104ZZ

P0AA6-526, P0AA6-611, P0AA6-612, P0AA6-613, P0AA6-614

HBC-423

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

3. Using a megohmmeter set to 500 V, measure the resistance

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 8.

5.

CHECK INVERTER WITH CONVERTER ASSEMBLY 

CAUTION:

Be sure to wear insulated gloves. 

1. Check that the service plug grip is not installed.

2. Remove the compressor fuse cover from the inverter with con-

verter assembly (See 

HBC-638, "Removal and Installation"

).

3. Disconnect the frame wire from the inverter with converter

assembly (See 

HBC-648, "Removal and Installation"

).

Air Conditioning Harness Assembly

Ground

Resistance

Harness connector

Terminal

F250

12 (–)

Ground

3 M

Ω or higher

11 (+)

Air Conditioning Harness Assembly

shielded wire 

ground

Resistance

Harness connector

Terminal

F250

12 (–)

shielded wire 

ground

3 M

Ω or higher

11 (+)

JMCIA0200GB

ALCIA0103ZZ

AWCIA0027ZZ

HBC-424

< COMPONENT DIAGNOSIS >

P0AA6-526, P0AA6-611, P0AA6-612, P0AA6-613, P0AA6-614

4. Using a megohmmeter set to 500 V, measure the resistance

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

NOTE:

• Be sure to set the megohmmeter to 500 V when perform-

ing this test. Using a setting higher than 500 V can result

in damage to the component being inspected.

• Perform this inspection with the air conditioning harness

assembly disconnected from the inverter with converter

assembly.

-

A/C fuse (1)

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 6.

6.

INSPECT HYBRID TRANSAXLE (MG2)

CAUTION:

Be sure to wear insulated gloves.

1. Check that the service plug grip is not installed.

NOTE:

After removing the service plug grip, do not turn ignition switch ON. (READY), unless instructed by the

service manual because this may cause a malfunction.

2. Disconnect the motor cable and generator cable from the inverter with converter assembly (See 

HBC-

638, "Removal and Installation"

).

3. Check the connectors connection.

4. Using a megohmmeter set to 500 V, measure the resistance

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

NOTE:

• Be sure to set the megohmmeter to 500 V when perform-

ing this test. Using a setting higher than 500 V can result

in damage to the component being inspected.

OK or NG

Inverter with converter assembly

Ground

Resistance

Harness connector

Terminal

Compressor fuse

- 

Ground

1.0 M

Ω or higher

ALCIA0108ZZ

Dirt or foreign objects have not entered the connection, or there is no evidence 
of contamination.

Motor Cable

Ground

Resistance

Harness connector

Terminal

—

U

Ground

20 M

Ω or higher

V

W

Motor Cable

Shielded wire 

ground

Resistance

Harness connector

Terminal

—

U

Shielded wire 

ground

20 M

Ω or higher

V

W

JMCIA0138GB