Nissan Altima HL32 Hybrid. Manual - part 648

P0A7A-522

HBC-341

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

NOTE:

• If DTC P0A7A-522 is output, the hybrid system cannot be restarted until the DTC is cleared.

• If the malfunction is not reproduced, leave the vehicle for 1 minute with the shift lever in the N position in

order to easily reproduce the malfunction.

Diagnosis Procedure

INFOID:0000000004211980

1.

PRECONDITIONING

• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, 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-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 CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CON-

NECTOR)

See 

HBC-109, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace inverter with converter assembly (See 

HBC-638, "Removal and Installation"

).

NG

>> Connect securely.

DTC No.

INF Code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A7A

522

Generator Inverter Performance Generator inverter gate malfunction

Inverter with converter assembly

HBC-342

< COMPONENT DIAGNOSIS >

P0A7A-809, P0A7A-811

P0A7A-809, P0A7A-811

Description

INFOID:0000000004211981

The inverter converts high-voltage direct current from the HV battery and alternating current for MG2 and

MG1. The inverter contains a three-phase bridge circuit, which consists of six power transistors each for MG2

and MG1, that converts direct current to three-phase alternating current. The MG ECU controls the actuation

of the power transistors. The inverter transmits information that is necessary for effecting control, such as the

amperage and voltage, to the MG ECU.

The MG ECU uses a voltage sensor, which is built into the inverter, to detect boosted high voltage to allow

control of the voltage boost.

The inverter voltage sensor outputs voltage that varies between 0 and 5 V in accordance with the changes in

the high voltage. The higher the high voltage, the higher the output voltage, and the lower the high voltage, the

lower the output voltage.

P0A7A-809, P0A7A-811

HBC-343

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

The MG ECU monitors the inverter voltage and detects malfunctions.

DTC Logic

INFOID:0000000004211982

DTC DETECTION LOGIC

If an abnormal amount of current flows through the generator inverter, the MG ECU detects it and sends a sig-

nal to inform the hybrid vehicle control ECU of the malfunction.

If the MG ECU detects that the generator inverter current exceeds the threshold level for a period of time, the

hybrid vehicle control ECU will illuminate the MIL and set a DTC.

JMCIA0099GB

HBC-344

< COMPONENT DIAGNOSIS >

P0A7A-809, P0A7A-811

Diagnosis Procedure

INFOID:0000000004211983

1.

PRECONDITIONING

• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, 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-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:

P0A7A-809 or 811 may be set due to a malfunction which also causes DTCs in the table above to be set.

In this case, first troubleshoot the output DTCs in the table above. Then, perform a test to attempt to

reproduce the problems, and check that no DTCs are output.

Is DTC detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 3.

3.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CON-

NECTOR)

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A7A

809

Generator Inverter Performance

Abnormal generator current value 
detection (MG ECU malfunction)

• Wire harness or connector
• Hybrid transaxle
• Inverter with converter assembly

811

Abnormal generator current value 
detection (hybrid transaxle mal-
function)

• Wire harness or connector
• Hybrid transaxle
• Inverter with converter assembly

DTC No.

Relevant Diagnosis

P0A1D (Except INF code 390)

Hybrid Powertrain Control Module

P0A1A (all INF codes)

Generator Control Module

P0A1B (all INF codes)

Drive Motor “A” Control Module

P0A72 (all INF codes)

Generator Phase V Current

P0A75 (all INF codes)

Generator Phase W Current

P0A60 (all INF codes)

Drive Motor “A” Phase V Current

P0A63 (all INF codes)

Drive Motor “A” Phase W Current

P0A4B-253

Generator Position Sensor Circuit

P0A4D-255

Generator Position Sensor Circuit Low

P0A4C-513

Generator Position Sensor Circuit Range/Performance

P0A3F-243

Drive Motor “A” Position Sensor Circuit

P0A41-245

Drive Motor “A” Position Sensor Circuit Low

P0A40-500

Drive Motor “A” Position Sensor Circuit Range / Performance

P0A78-266, 267, 523, 586

Drive Motor “A” Inverter Performance

P0A94-585, 587, 589, 590

DC/DC Converter Performance