Nissan Altima HL32 Hybrid. Manual - part 638

 

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Nissan Altima HL32 Hybrid. Manual - part 638

 

 

P0A7A-122

HBC-301

< COMPONENT DIAGNOSIS >

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P0A7A-122

Description

INFOID:0000000004211957

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.

HBC-302

< COMPONENT DIAGNOSIS >

P0A7A-122

The MG ECU monitors the inverter voltage and detects malfunctions.

DTC Logic

INFOID:0000000004211958

DTC DETECTION LOGIC

If the generator inverter circuit is open or shorted, or if the circuit overheats, the malfunction is transmitted from

the inverter to the GFIV terminal of the MG ECU via the generator inverter fail signal line.

JMCIA0099GB

P0A7A-122

HBC-303

< COMPONENT DIAGNOSIS >

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Diagnosis Procedure

INFOID:0000000004211959

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-122 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?

DTC No.

INF code

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0A7A

122

Generator Inverter 
Performance

Generator inverter fail signal detection 
(overcurrent due to system malfunction)

• Fuel level
• Hybrid transaxle
• Engine assembly
• Inverter with converter assembly
• Wire harness or connector

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, 505, 287, 506, 
503, 279, 504, 306, 806, 807, 808

Drive Motor “A” Inverter Performance

P0A94-585, 587, 589, 590, 554, 555, 556, 
547, 548, 549, 442

DC/DC Converter Performance

P0A7A-517, 325, 518, 344, 809, 810, 811

Generator Inverter Performance

P0A92-521

Hybrid Generator Performance

P0A90-509

Drive Motor “A” Performance

HBC-304

< COMPONENT DIAGNOSIS >

P0A7A-122

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 3.

3.

CHECK AMOUNT OF GASOLINE

1. Turn ignition switch ON.

2. Check the amount of fuel by referring to the fuel gauge in the meter.

OK or NG

OK

>> GO TO 4.

NG

>> Refuel vehicle.

4.

CHECK ENGINE START

1. Turn ignition switch ON (READY).

2. Check if the engine starts.

NOTE:

Depressing the accelerator pedal with the shift lever in the P position will cause the engine to start.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 5.

5.

INSPECT CRANKSHAFT PULLEY REVOLUTION (P POSITION)

1. Turn ignition switch OFF, move the shift lever to the P position, and lift up the vehicle.

2. Turn the crankshaft pulley using hand tools to check if the crankshaft pulley can rotate.

CAUTION:

Do not turn ignition switch ON (READY) while performing this inspection. Be sure to turn ignition

switch OFF before performing this inspection, to prevent the engine from starting.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

INSPECT CRANKSHAFT PULLEY REVOLUTION (N POSITION)

1. Lower the vehicle.

2. Turn ignition switch OFF, move the shift lever to the N position, and lift up the vehicle.

3. Turn the crankshaft pulley using hand tools to check if the crankshaft pulley can rotate.

CAUTION:

Do not turn ignition switch ON (READY) while performing this inspection. Be sure to turn ignition

switch OFF before performing this inspection, to prevent the engine from starting.

OK or NG

OK

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

NG

>> Repair or replace engine assembly.

7.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CON-

NECTOR)
See 

HBC-109, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 8.

NG

>> Connect securely.

8.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RE-

SOLVER)

Proper amount of fuel is in the tank.

The engine starts.

The crankshaft pulley rotates.

The crankshaft pulley rotates.

 

 

 

 

 

 

 

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