Nissan Altima HL32 Hybrid. Manual - part 513

P0AA6-611 ELECTRIC COMPRESSOR

HAC-73

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

CAUTION:

If the results are out of the specified range, replace the compressor without operating.

Is DTC detected?

YES

>> Replace electric compressor. Refer to 

HA-31, "Removal and Installation"

.

NO

>> Replace air conditioning cycle. 

Electric compressor

(—)

Resistance (

Ω)

Connector

Terminal

F252

7

Ground

Always

3 M

Ω or higher

8

HAC-74

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

U0424 ELECTRIC COMPRESSOR

U0424 ELECTRIC COMPRESSOR

Description

INFOID:0000000004215362

The HV ECU and electric compressor transmit information to one another via a communication line. Compres-

sor control is stopped and the DTC is output if communication information is cut off or abnormal information

occurs.The DTC is also detected if high-voltage power supplied from the MG ECU to the compressor control

circuit is shut off.The output DTC is memorized as current trouble.

CAUTION:

• Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures

may require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip

because other workers may install it by mistake.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is

removed.

DTC Logic

INFOID:0000000004215363

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON (READY) and wait at least 5 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to Diagnosis Procedure. 

HAC-74, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

INFOID:0000000004215364

CAUTION:

• Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures

may require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip

because other workers may install it by mistake.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is

removed.

1.

CHECK CAN COMMUNICATION

Use the CONSULT–III to check if the CAN Communication System is functioning normally.
Is DTC detected?

YES

>> Check CAN communication. Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

NO

>> GO TO 2.

2.

CHECK DIAGNOSTIC TROUBLE CODE

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

U0424

COMMUNICATION FAILU-
RA

• After READY and A/C ON
• Communication line error or open between 

the HV ECU and the electric compressor.

• High-voltage power source is shut off.

• Harness or connector between HV ECU 

and electric compressor and ground

• Electric compressor
• HV ECU
• MG  ECU
• Electric vehicle fuse
• CAN communication system
• Hybrid control system

U0424 ELECTRIC COMPRESSOR

HAC-75

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Check if DTCs for the hybrid control system are output using the CONSULT-III.
Is DTC detected?

YES-1 >> Only DTC P3108 is output: GO TO 3.

YES-2 >> DTCs other than P3108 are output: Refer to 

HBC-9, "Work Flow"

.

NO

>> GO TO 3.

3.

INSPECT FUSE

1. Remove the 10A fuse [No. 3 located in the fuse block (J/B)]. Refer to 

PG-64, "Terminal Arrangement"

.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace the 10A fuse [No. 3 located in the fuse block (J/B)]. Refer to 

PG-64, "Terminal Arrange-

ment"

.

4.

CHECK ELECTRIC COMPRESSOR GROUND CIRCUIT

1. Disconnect the electric compressor connector.

CAUTION:

Do not disconnect the connector on the high-voltage side.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK HARNESS AND CONNECTOR

1. Turn ignition switch ON.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK HARNESS AND CONNECTOR (HV ECU -ELECTRIC COMPRESSOR)

1. Disconnect the HV ECU connector.

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

10A fuse (No. 3)

Condition

Resistance (

Ω)

A

B

Always

Below  1.0

Electric compressor

–

Condition

Resistance (

Ω)

 Connector

 Terminal

F251

5

Ground

Always

Below 1.0

(+)

(

−)

Condition

Voltage (V)

Electric compressor

 Connector

 Terminal

 Connector

 Terminal

F251

6

F251

5

IGN SW: ON (READY)

10 to 14

IGN SW: OFF

Below 1.0

Electric compressor

HV ECU

Condition

Resistance (

Ω)

 Connector

 Terminal

 Connector

 Terminal

F251

1

E65

55

Always

Below 1.0

2

54

3

53

HAC-76

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

U0424 ELECTRIC COMPRESSOR

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

INSPECT ELECTRIC VEHICLE FUSE

1. Turn ignition switch OFF.

2. Remove the service plug grip.

CAUTION:

• Be sure to wear insulated gloves.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip

is removed.

NOTE:

Do not start the engine with the service plug grip removed because it may cause a malfunction.

3. Remove the connector cover assembly.

CAUTION:

Be sure to wear insulated gloves.

NOTE:

Be sure to prevent foreign objects or water from entering the MG ECU.

4. Check that bolts A and B are tightened securely.

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

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace electric vehicle fuse.

Electric compressor

–

Condition

Resistance (

Ω)

 Connector

 Terminal

F251

1

Ground

Always

10 k or higher

2

3

JPIIA0313GB

MG ECU

Condition

Resistance (

Ω)

Electric vehicle fuse

A

B

Always

Below 1.0