Nissan Altima HL32 Hybrid. Manual — part 622
P0A78-128
HBC-237
< COMPONENT DIAGNOSIS >
D
E
F
G
H
I
J
K
L
M
A
B
HBC
N
O
P
P0A78-128
Description
INFOID:0000000004211912
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.
![](/vehicles/gon/sttello/nita/knto.png)
HBC-238
< COMPONENT DIAGNOSIS >
P0A78-128
The MG ECU monitors the inverter voltage and detects malfunctions.
DTC Logic
INFOID:0000000004211913
DTC DETECTION LOGIC
If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal
to inform the hybrid vehicle control ECU of the malfunction.
JMCIA0099GB
DTC No.
INF Code
Trouble diagnosis name
DTC detecting condition
Possible cause
P0A78
128
Drive Motor “A” Inverter
Performance
Abnormal motor current value detection
(System malfunction)
• Wire harness or connector
• Hybrid transaxle
• Inverter with converter assembly
![](/vehicles/gon/sttello/nita/beraiell.png)
P0A78-128
HBC-239
< COMPONENT DIAGNOSIS >
D
E
F
G
H
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K
L
M
A
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HBC
N
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Diagnosis Procedure
INFOID:0000000004211914
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:
P0A78-128 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)
HBC-109, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 4.
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
![](/vehicles/gon/sttello/nita/yoooshe.png)
HBC-240
< COMPONENT DIAGNOSIS >
P0A78-128
NG
>> Connect securely.
4.
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RE-
SOLVER)
See
HBC-164, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness or connector.
5.
CHECK GENERATOR RESOLVER
See
HBC-164, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 12.
6.
CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLV-
ER)
See
HBC-171, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 7.
NG
>> Repair or replace harness or connector.
7.
CHECK MOTOR RESOLVER
See
HBC-171, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 14.
8.
CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTOR CONDITION)
See
HBC-177, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 9.
NG
>> Tighten to specified torque.
9.
CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)
See
HBC-177, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 10.
NG
>> Tighten to specified torque.
10.
INSPECT HYBRID TRANSAXLE (MG1)
See
HBC-177, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 11.
NG
>> Replace hybrid transaxle (See
TM-36, "Removal and Installation"
11.
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"
12.
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
See
HBC-164, "Diagnosis Procedure"
OK or NG
OK
>> GO TO 13.
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