Nissan Altima HL32 Hybrid. Manual - part 708

U0115-901

HBC-581

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 4.

4.

CHECK DTC OUTPUT (HYBRID SYSTEM)

1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.

2. Check DTC for hybrid vehicle control system.
Is DTC P0A1D-924 or P0A1D-925 detected?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

REPLACE HYBRID VEHICLE CONTROL ECU

See 

HBC-644, "Removal and Installation"

.

>> Go to 

HBC-12, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair

Requirement"

.

HBC-582

< COMPONENT DIAGNOSIS >

U0129-220, U0129-222, U0129-528

U0129-220, U0129-222, U0129-528

Description

INFOID:0000000004212178

The hybrid vehicle control ECU transmits and receives signals to and from the ECM, the brake ECU, the EPS

control unit and network gateway ECU via CAN communication.

DTC Logic

INFOID:0000000004212179

DTC DETECTION LOGIC

If the hybrid vehicle control ECU detects a problem with CAN communication between the ECU and the brake

ECU, the hybrid vehicle control ECU will set a DTC.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC confirmation procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to 

HBC-582, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004212180

Go to 

LAN-53, "Trouble Diagnosis Flow Chart"

.

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

U0129

220

Lost communication with brake 
system control

Problem with CAN communication be-
tween the brake ECU and hybrid vehicle 
control ECU (no signal reception)

CAN communication system

U0129

222

Problem with CAN communication be-
tween the brake ECU and hybrid vehicle 
control ECU (signal transmission error)

U0129

528

Problem with CAN communication be-
tween the brake ECU and hybrid vehicle 
control ECU (CAN communication sys-
tem malfunction)

U0129-529

HBC-583

< COMPONENT DIAGNOSIS >

D

E

F

G

H

I

J

K

L

M

A

B

HBC

N

O

P

U0129-529

Description

INFOID:0000000004212181

The hybrid vehicle control ECU transmits and receives signals to and from the ECM, the brake ECU, the EPS

control unit and network gateway ECU via CAN communication.

DTC Logic

INFOID:0000000004212182

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC confirmation procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to 

HBC-583, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM TEST DRIVE

1. Drive the vehicle under the similar conditions to freeze frame data for a certain time.

CAUTION:

Always drive the vehicle in safe manner according to traffic conditions and obey all traffic laws

when driving.

2. Check DTC.
Is DTC detected?

YES

>> Go to 

HBC-583, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004212183

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 HARNESS CONTINUITY BETWEEN HYBRID VEHICLE CONTROL ECU AND BRAKE ECU

Refer to 

LAN-4, "Description"

.

OK or NG

DTC No.

INF code

Trouble diagnosis name

DTC detecting condition

Possible cause

U0129

529

Lost communication with Brake 
System Control Module

The hybrid vehicle control ECU 
receives a malfunction signal 
from the brake ECU

• Brake  ECU
• Hybrid vehicle control ECU

HBC-584

< COMPONENT DIAGNOSIS >

U0129-529

OK

>> GO TO 3.

NG

>> Repair or replace harness or connectors.

3.

CHECK DTC OUTPUT (BRAKE)

1. Turn ignition switch ON.

2. Check DTC for brake system.
Is DTC detected?

YES

>> Go to Diagnosis Procedure relevant to output DTC.

NO

>> GO TO 4.

4.

REPLACE HYBRID VEHICLE CONTROL ECU

See 

HBC-644, "Removal and Installation"

.

>> INSPECTION END