Nissan Altima HL32 Hybrid. Manual - part 143

C1378

BRC-137

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Special Repair Requirement

INFOID:0000000004212730

1.

ZERO ADJUSTMENT FOR EACH SENSOR AND OFFSET LEANING FOR LINEAR SOLENOID VALVE

After erasing brake ECU memories, perform zero adjustment of following sensors and initialization of linear

solenoid valve.

• Steering angle sensor: 

BRC-9, "PERFORM ZERO POINT OF STEERING ANGLE SENSOR : Description"

.

• Yaw rate/side/decel G sensor: 

BRC-8, "PERFORM ZERO POINT OF YAW RATE/SIDE/DECEL G SENSOR

: Description"

.

• Brake stroke sensor: 

BRC-9, "PERFORM ADJUSTMENT OF STROKE SENSOR : Description"

.

• Linear solenoid valve: 

BRC-7, "PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALI-

BRATION : Description"

.

>> END

BRC-138

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1391

C1391

Description

INFOID:0000000004212731

The DTC is stored if a brake fluid, internal or other leak is detected due to improper sealing in the actuator.

Internal leakage is suspected if the pump motor operates frequently without braking.

DTC Logic

INFOID:0000000004212732

Diagnosis Procedure

INFOID:0000000004212733

CAUTION:

When replacing the brake ECU or brake actuator assembly, perform initialization of linear solenoid

valve and calibration.

1.

CHECK FOR BRAKE FLUID LEAKS

1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder

which is the cause of DTCs.

2. Check that the brake is not dragging.

NOTE:

There is no fluid leakage or dragging.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace applicable part.

2.

READ VALUE OF CONSULT-III (ACCUMULATOR PRESSURE SENSOR)

1. Connect the CONSULT-III.

2. Turn the ignition switch ON.

3. Select the “DATA MONITOR” on the CONSULT-III.

ABS/VDC:

4. Wait a few minutes without operating the brake pedal.

5. Check that the output value of the accumulator pressure sensor does not decrease and that the pump

motor is not activated due to a decrease in accumulator pressure.

NOTE:

Accumulator pressure does not decrease and the pump motor is not activated due to a decrease in accu-

mulator pressure.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace brake actuator assembly.

3.

RECONFIRM DTC

1. Turn the ignition switch OFF.

2. Clear the DTC.

3. Turn the ignition switch ON.

4. Check if the same DTC is recorded.

DTC

INF code

Display item

DTC detection condition

Trouble area

C1391

591

ACC LEAK

Accumulator performance is deteriorated (im-
proper sealing inside the actuator, gas pres-
sure drop inside the accumulator, leak in each 
pressure boosting valve).

• Fluid leakage
• Brake actuator assem-

bly

Tester display

Measurement item/ Range

Normal condition

ACC PRESS SEN

Accumulator pressure sensor/ 
min: 0 V, max: 5 V

Around: 3.3 to 4.7 V

C1391

BRC-139

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Result

A

>> Check for intermittent problems (symptom simulation).

B

>> Replace brake ECU.

Special Repair Requirement

INFOID:0000000004212734

1.

ZERO ADJUSTMENT FOR EACH SENSOR AND OFFSET LEANING FOR LINEAR SOLENOID VALVE

After erasing brake ECU memories, perform zero adjustment of following sensors and initialization of linear

solenoid valve.

• Steering angle sensor: 

BRC-9, "PERFORM ZERO POINT OF STEERING ANGLE SENSOR : Description"

.

• Yaw rate/side/decel G sensor: 

BRC-8, "PERFORM ZERO POINT OF YAW RATE/SIDE/DECEL G SENSOR

: Description"

.

• Brake stroke sensor: 

BRC-9, "PERFORM ADJUSTMENT OF STROKE SENSOR : Description"

.

• Linear solenoid valve: 

BRC-7, "PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALI-

BRATION : Description"

.

>> END

Condition

Proceed to

DTC (C1391) is not output.

A

DTC (C1391) is output.

B

BRC-140

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

U0073, U0123, U0124, U0126, U0293

U0073, U0123, U0124, U0126, U0293

Description

INFOID:0000000004212735

The brake ECU receives the signals from the HV ECU, steering angle sensor, and yaw rate/side/decel G sen-

sor via the CAN communication system.

DTC Logic

INFOID:0000000004212736

DTC

INF code

Display item

DTC detection condition

Trouble area

U0073

360

LOST COMM YAW/STRG

When either of the following detected:
1.

After the output of data from the brake 
ECU is completed, the sending contin-
ues for 5 seconds or more.

2.

The condition that bus OFF state occurs 
once or more within 100 ms occurs 10 
times in succession. (Sent signals can-
not be received.)

• CAN communication 

system

U0123

338

LOST COMM(YAW)

When either of the following detected:
1.

With the IG1 terminal voltage 9.5 V or 
more, data from the yaw rate sensor 
cannot be received for 1 second or more.

2.

With the IG1 terminal voltage 9.5 V or 
more, the following occurs 10 times in 
succession.

• The condition that data from the yaw rate 

snesor cannot be received occurs once or 
more within 5 seconds.

• CAN communication 

system
(Brake ECU to yaw 
rate/side/decel G sen-
sor)

U0124

319

LOST COMM(LATERAL)

When either of the following detected:
1.

With the IG1 terminal voltage 9.5 V or 
more, data from the deceleration sensor 
cannot be received for 1 second or more.

2.

With the IG1 terminal voltage 9.5 V or 
more, the following occurs 10 times in 
succession.

• The condition that data from the decelera-

tion sensor cannot be received occurs once 
or more within 5 seconds.

• CAN communication 

system
(Brake ECU to yaw 
rate/side/decel G sen-
sor)

U0126

350

LOST COMM(STRG)

When either of the following detected:
1.

With the IG1 terminal voltage 9.5 V or 
more, data from the steering angle sen-
sor cannot be received for 1 second or 
more.

2.

With the IG1 terminal voltage 9.5 V or 
more, the following occurs 10 times in 
succession.

• The condition that data from the steering 

angle sensor cannot be received occurs 
once or more within 5 seconds.

• CAN communication 

system
(Brake ECU to steering 
angle sensor)