Nissan Altima HL32 Hybrid. Manual - part 595

P0A08-101

HBC-129

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P0A08-101

Description

INFOID:0000000004211786

The cooling fan of the HV battery and cooling fan in the hybrid vehicle converter are used to cool the hybrid

vehicle converter (DC/DC converter).

DTC Logic

INFOID:0000000004211787

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000004211788

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.

Placing an object on the package tray trim panel assembly, which is the inlet of the duct, may cause the duct

to be unable to take in air. In this case, DTCs may be set.

1.

HV battery air intake duct

2.

Converter cooling fan

3.

HV battery air exhaust duct

4.

Battery cooling blower assembly

ALCIA0012ZZ

DTC No.

INF Code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A08

101

DC/DC Converter Status Circuit

Overheating of the hybrid vehicle 
converter (DC/DC converter)

• Duct
• Hybrid vehicle converter (DC/DC 

converter)

• Auxiliary battery

HBC-130

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P0A08-101

>> GO TO 2.

2.

CHECK PACKAGE TRAY TRIM PANEL ASSEMBLY

1. Check that the air intake grill of the package tray trim panel assembly is not clogged.

OK or NG

OK

>> GO TO 3.

NG

>> Remove foreign object.

3.

CHECK AIR DUCT (ALL)

1. Check if the duct is installed correctly.

2. Check the duct for clogging.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace air duct (all).

4.

REPLACE HYBRID VEHICLE CONVERTER

1. Replace the hybrid vehicle converter (DC/DC converter) (See 

HBB-103, "Removal and Installation"

).

>> GO TO 5.

5.

CHECK AUXILIARY BATTERY

1. Turn ignition switch to READY position.

2. Leave the vehicle for 5 minutes.

3. Measure the voltage of the auxiliary battery.

OK or NG

OK

>> COMPLETED

NG

>> Check and replace auxiliary battery.

The air intake grill is not clogged.

The duct is installed correctly.

The duct is not clogged.

More than 10.5 V

P0A08-264

HBC-131

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P0A08-264

Description

INFOID:0000000004211789

The hybrid vehicle converter (DC/DC converter) converts the DC 244.8 V of the HV battery into DC 12 V in

order to supply power to areas such as the vehicle's lighting, audio, and ECU systems. In addition, it charges

the auxiliary battery.

A transistor bridge circuit initially converts DC 244.8 V into alternating current, and a transformer lowers its

voltage. Then, it is rectified and smoothed (into DC) and converted into DC 12 V.

The hybrid vehicle converter (DC/DC converter) controls the output voltage in order to keep a constant voltage

at the terminals of the auxiliary battery.

The hybrid vehicle control ECU uses the NODD signal line to transmit a stop command to the hybrid vehicle

converter (DC/DC converter) and receive signals indicating the normal or abnormal condition of the 12 V

charging system.

If the vehicle is being driven with an inoperative hybrid vehicle converter (DC/DC converter), the voltage of the

auxiliary battery will drop, which will prevent the continued operation of the vehicle. Therefore, the hybrid vehi-

cle control ECU monitors the operation of the hybrid vehicle converter (DC/DC converter) and alerts the driver

if it detects a malfunction.

JMCIA0093GB

HBC-132

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P0A08-264

DTC Logic

INFOID:0000000004211790

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000004211791

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

1. Turn ignition switch ON.

2. Check DTC.

JMCIA0139GB

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

P0A08

264

DC/DC converter status circuit

Malfunction in the hybrid vehicle 
converter (DC/DC converter)

• Wire harness or connector
• Fusible link or fuse
• Frame wire
• Hybrid vehicle converter (DC/DC 

connector)

• Hybrid vehicle control ECU