Nissan Qashqai J11. Manual - part 935

PB-122

< DTC/CIRCUIT DIAGNOSIS >

U0401 ECM SIGNAL

U0401 ECM SIGNAL

DTC Description

INFOID:0000000010833707

DTC DETECTION LOGIC

POSSIBLE CAUSE

• ECM
• Parking brake control module

FAIL-SAFE

Automatic apply and release are prohibited.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn the ignition switch OFF
and wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1.

Turn the ignition switch OFF to ON.

CAUTION:

Be sure to wait for 10 seconds after turning ignition switch OFF or ON.

2.

Push the parking brake switch.

CAUTION:

• Set the select lever in the P position.
• Depress the brake pedal.

3.

Pull the parking brake switch.

4.

Perform self-diagnosis for “EHS/PKB”.

Is DTC “U0401” detected?

YES

>> Proceed to 

PB-122, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010833708

1.

ERFORM SELF-DIAGNOSIS (1)

With CONSULT

Perform self-diagnosis for “ENGINE”.

Is DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS (2)

With CONSULT

1.

Turn the ignition switch OFF to ON.

CAUTION:

Be sure to wait for 10 seconds or more after turning the ignition switch OFF.

2.

Erase self-diagnosis result for “EHS/PKB”.

3.

Repeat the parking brake switch operation (pull and push) five times.

DTC

Display Item

(Trouble diagnosis content)

Malfunction detected condition

U0401

VCM
(Vehicle control module)

When a malfunction is detected in ECM system.

U0401 ECM SIGNAL

PB-123

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

G

H

I

J

K

L

M

A

B

PB

N

O

P

4.

Perform self-diagnosis for “EHS/PKB”.

Is DTC “U0401”, “U1000” detected?

YES (“U0401”)>>Replace the electric parking brake control module. Refer to 

PB-141, "Removal and Installa-

tion"

.

YES (“U1000”)>>Proceed to 

LAN-28, "Trouble Diagnosis Flow Chart"

.

NO

>> INSPECTION END

PB-124

< DTC/CIRCUIT DIAGNOSIS >

U0418 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SIGNAL

U0418 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SIGNAL

DTC Description

INFOID:0000000010833709

DTC DETECTION LOGIC

POSSIBLE CAUSE

• ABS actuator and electric unit (control unit)
• Electric parking brake control module

FAIL-SAFE

• Automatic apply and release are prohibited.
• Brake force is degraded.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn the ignition switch OFF
and wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1.

Turn the ignition switch OFF to ON.

CAUTION:

Be sure to wait for 10 seconds after turning ignition switch OFF or ON.

2.

Push the parking brake switch.

CAUTION:

• Set the select lever in the P position.
• Depress the brake pedal.

3.

Pull the parking brake switch.

4.

Perform self-diagnosis for “EHS/PKB”.

Is DTC “U0418” detected?

YES

>> Proceed to 

PB-124, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010833710

1.

ERFORM SELF-DIAGNOSIS (1)

With CONSULT

Perform self-diagnosis for “ABS”.
Is DTC detected?

YES

>> Check the DTC. Refer to 

BRC-54, "DTC Index"

.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS (2)

With CONSULT

1.

Turn the ignition switch OFF to ON.

CAUTION:

Be sure to wait for 10 seconds or more after turning the ignition switch OFF.

DTC

Display Item

(Trouble diagnosis content)

Malfunction detected condition

U0418

BRAKE SYSTEM CONTROL 
MODULE
(Brake system control module)

When a malfunction is detected in ABS actuator and electric unit (control unit) system.

U0418 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SIGNAL

PB-125

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

G

H

I

J

K

L

M

A

B

PB

N

O

P

2.

Erase self-diagnosis result for “EHS/PKB”.

3.

Repeat the parking brake switch operation (pull and push) five times.

4.

Perform self-diagnosis for “EHS/PKB”.

Is DTC “U0418”, “U1000” detected?

YES (“U0418”)>>Replace the electric parking brake control module. Refer to 

PB-141, "Removal and Installa-

tion"

.

YES (“U1000”)>>Proceed to 

LAN-28, "Trouble Diagnosis Flow Chart"

.

NO

>> INSPECTION END