Nissan Altima HL32 Hybrid. Manual - part 660

P0A94-553

HBC-389

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

OK

>> GO TO 13.

NG

>> GO TO 28.

13.

CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN MOTOR CONNECTOR)

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 14.

NG

>> Connect securely.

14.

PERFORM ACTIVE TEST BY CONSULT-III (COOLING FAN SPD)

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 15.

NG

>> Check cooling fan system (See 

EC-382, "Component Function Check"

).

15.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CON-

NECTOR)

See 

HBC-109, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 16.

NG

>> Connect securely.

16.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR

RESOLVER)

See 

HBC-164, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 17.

NG

>> Repair or replace harness or connector.

17.

CHECK GENERATOR RESOLVER

See 

HBC-164, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 18.

NG

>> GO TO 24.

18.

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

SOLVER)

See 

HBC-171, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 19.

NG

>> Repair or replace harness or connector.

19.

CHECK MOTOR RESOLVER

See 

HBC-171, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 20.

NG

>> GO TO 26.

20.

CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDI-

TION)

See 

HBC-177, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 21.

NG

>> Tighten to specified torque.

21.

CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

See 

HBC-177, "Diagnosis Procedure"

.

HBC-390

< COMPONENT DIAGNOSIS >

P0A94-553

OK or NG

OK

>> GO TO 22.

NG

>> Tighten to specified torque.

22.

INSPECT HYBRID TRANSAXLE (MG1)

See 

HBC-177, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 23.

NG

>> Replace hybrid transaxle.

23.

INSPECT HYBRID TRANSAXLE (MG2)

See 

HBC-177, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace inverter with converter assembly (See 

HBC-638, "Removal and Installation"

).

NG

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

24.

CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)

See 

HBC-164, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 25.

NG

>> Connect securely.

25.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR

RESOLVER)
See 

HBC-164, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

26.

CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)

See 

HBC-171, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 27.

NG

>> Connect securely.

27.

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

SOLVER)
See 

HBC-171, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace hybrid transaxle (See 

TM-36, "Removal and Installation"

).

NG

>> Repair or replace harness or connector.

28.

PERFORM ACTIVE TEST BY CONSULT-III (INV WATER PUMP)

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> Add coolant.

NG

>> GO TO 29.

29.

CHECK WATER PUMP WITH MOTOR & BRACKET ASSEMBLY

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 30.

NG

>> GO TO 32.

30.

CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY - HV

CONTROL ECU)
See 

HBC-362, "Diagnosis Procedure"

.

P0A94-553

HBC-391

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

OK or NG

OK

>> GO TO 31.

NG

>> Repair or replace harness or connector.

31.

CHECK HIGH VOLTAGE FUSE AND FUSIBLE LINK BOX

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace hybrid vehicle control ECU. Refer to 

HBC-12, "ADDITIONAL SERVICE WHEN REPLAC-

ING CONTROL UNIT : Special Repair Requirement"

.

NG

>> Repair or replace high voltage fuse and fusible link box.

32.

CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT)

See 

HBC-362, "Diagnosis Procedure"

.

OK or NG

OK

>> Replace water pump with motor & bracket assembly.

NG

>> Repair or replace harness or connector.

HBC-392

< COMPONENT DIAGNOSIS >

P0A94-554, P0A94-556

P0A94-554, P0A94-556

Description

INFOID:0000000004212023

The boost converter boosts the 244.8 V DC from the HV battery to a maximum of approximately 650 V DC.

The inverter converts the voltage that has been boosted by the boost converter into alternating current, which

is used for driving MG2 and MG1. When MG1 and MG2 operate as a generator, the alternating-current voltage

from MG1 and MG2 is converted into direct-current voltage by the inverter.

Then the boost converter drops this voltage to a direct-current voltage rating of 244.8 V in order to charge the

HV battery.

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before

it is boosted. It also uses a voltage sensor (VH) that is built into the inverter to detect the high voltage after it is

boosted. Based on the voltage before and after it is boosted, the hybrid vehicle control ECU controls the oper-

ation of the boost converter to boost the voltage to the target voltage.

DTC Logic

INFOID:0000000004212024

DTC DETECTION LOGIC

If excessive amperage flows through the boost converter (inverter with converter assembly) due to an internal

short, the boost converter will transmit a boost converter fail signal to the MG ECU. Upon receiving this signal,

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

Diagnosis Procedure

INFOID:0000000004212025

1.

PRECONDITIONING

JMCIA0102GB

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A94

554

DC/DC Converter Performance

Boost converter inverter fail sig-
nal detection (overcurrent due to 
MG ECU malfunction)

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

556

Boost converter inverter fail sig-
nal detection (overcurrent due to 
hybrid transaxle malfunction)

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