Nissan Qashqai J11. Manual - part 207

ECH-126

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

U0111 LIN COMMUNICATION

U0111 LIN COMMUNICATION

DTC Logic

INFOID:0000000010786461

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 3 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECH-126, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010786462

1.

CHECK LIN COMMUNICATION CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector and alternator harness connector.

3.

Check the continuity between ECM harness connector and alternator harness connector.

4.

Also check harness for short to power and short to ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK ALTERNATOR

Check alternator. Refer to 

CHG-15, "Work Flow"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace alternator. Refer to 

CHG-28, "HRA2DDT : Removal and Installation"

.

3.

CHECK DTC

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to 

ECH-126, "DTC Logic"

.

Is DTC detected again?

YES

>> Replace ECM.

NO

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U0111

Lost communication with battery energy 
control module “A”

ECM detects LIN communication error.

• Harness and connectors

(LIN communication circuit is 
open or shorted.)

• Alternator
• ECM

+

−

Continuity

ECM

Alternator

Connector

Terminal

Connector

Terminal

F18

123

F54

2

Existed

U0121 CAN COMMUNICATION

ECH-127

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

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U0121 CAN COMMUNICATION

DTC Logic

INFOID:0000000010500803

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 3 seconds.

2.

Check DTC.

Is DTC detected?

YES

>>

ECH-127, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500804

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check DTC with ABS actuator and electric unit (control unit). Refer to 

BRC-42, "CONSULT Function"

.

Is DTC detected?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Perform trouble shooting relevant to DTC indicated.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

U0121

LOST COMM (ABS)
(Lost communication with 
anti-lock brake system (ABS) 
control module)

When ECM is not transmitting or receiving CAN 
communication signal between ABS actuator and 
electric unit (control unit).

ABS actuator and electric unit 
(control unit)

ECH-128

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

U0298 DC/DC CONVERTER

U0298 DC/DC CONVERTER

DTC Logic

INFOID:0000000010500805

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 12 minutes or more to start this procedure.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Start the engine and warm it up to normal operating temperature.

2.

Press start/stop OFF switch and check that the switch indicator is ON.

3.

Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

4.

Touch “START” and operate stop/start system. (Stop the engine.)

5.

Touch “CANCEL” and restart the engine.

6.

Check DTC.

Without CONSULT

1.

Activate stop/start system. Refer to 

ECH-33, "STOP/START SYSTEM : System Description"

.

CAUTION:

Always drive vehicle at a safe speed.

2.

Restart the engine.

3.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECH-128, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500806

1.

CHECK VOLTAGE STABILIZER SIGNAL

With CONSULT

1.

Start the engine and warm it up to normal operating temperature.

2.

Press start/stop OFF switch and check that the switch indicator is ON.

3.

Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

4.

Touch “START” and operate stop/start system. (engine stop.)

5.

Touch “CANCEL” and restart the engine, and then check the voltage between DC/DC converter harness
connector and ground as per the following conditions.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

U0298

COMMUNICATION ERROR 
(LOST)
(Lost communication with DC 
to DC converter control module 
“A”)

During the restart, the DC/DC converter 
status of the engine communication line 
does not show an decrease in voltage 
after an ECM transmitted voltage stabi-
lizer signal is changed from battery volt-
age to 2.0 V or less.

• Harness and connectors

(Voltage stabilizer signal line is open or cir-
cuit shorted.)

• DC/DC converter

+

–

Condition

Voltage

(Approx.)

DC/DC converter

Connector

Terminal

M22

9

Ground

While cranking with restart

2.0 V or less

Except above

Battery voltage

U0298 DC/DC CONVERTER

ECH-129

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

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Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK VOLTAGE STABILIZER SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect DC/DC converter harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between DC/DC converter harness connector and ECM harness connector.

5.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

3.

CHECK INTERMITTENT INCIDENT

Perform intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace DC/DC converter. Refer to 

ECH-314, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK INTERMITTENT INCIDENT

Perform intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace ECM. Refer to 

ECH-313, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

+

–

Continuity

DC/DC converter

ECM

Connector

Terminal

Connector

Terminal

M22

9

F17

56

Existed