Nissan X-Trail 32. Manual - part 1996

STC-34

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

DTC Description

INFOID:0000000010688426

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.

DTC DETECTION LOGIC

POSSIBLE CAUSE

• CAN communication error

FAIL-SAFE

System continue normal control.

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.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS/DAST 3” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-34, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010688427

Proceed to 

LAN-17, "Trouble Diagnosis Flow Chart"

.

DTC

Display item

(Trouble diagnosis content)

Malfunction detected condition

U1000

CAN COMM CIRCUIT
(CAN communication circuit)

EPS control unit is not transmitting/receiving CAN communi-
cation signal for 2 seconds or more.

U1010 CONTROL UNIT (CAN)

STC-35

< DTC/CIRCUIT DIAGNOSIS >

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U1010 CONTROL UNIT (CAN)

DTC Description

INFOID:0000000010688428

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with
2communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wir-
ing. Each control unit communicate data but selectively reads required data only.

DTC DETECTION LOGIC

POSSIBLE CAUSE

• EPS control unit (steering column assembly)

FAIL-SAFE

System continue normal control.

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.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS/DAST 3” self-diagnosis.

Is DTC “U1010” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-35, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010688429

1.

CHECK SELF-DIAGNOSIS RESULTS

Check that there is no malfunction in EPS control unit harness connector or disconnection.
Is the inspection result normal?

YES

>> Replace steering column assembly. Refer to 

ST-13, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC

Display item

(Trouble diagnosis content)

Malfunction detected condition

U1010

CONTROL UNIT (CAN)
(Control unit [CAN communication])

When detecting error during the initial diagnosis of CAN control-
ler to EPS control unit.

STC-36

< DTC/CIRCUIT DIAGNOSIS >

U1970 AROUND VIEW MONITOR SYSTEM

U1970 AROUND VIEW MONITOR SYSTEM

DTC Description

INFOID:0000000010688430

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connector

(CAN communication line)

• EPS control unit (steering column assembly)
• Around view monitor control unit

FAIL-SAFE

Around view monitor with park assist function stops (controlled by around view monitor).

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.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS/DAST 3” self-diagnosis.

Is DTC “U1970” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-36, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010688431

1.

CHECK AROUND VIEW MONITOR CONTROL UNIT

1.

Turn ignition switch OFF.

2.

Disconnect around view monitor control unit harness connector.

3.

Check the around view monitor control unit pin terminals (CAN communication lines) for damage or loose
connection with harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Recheck terminals for damage or loose connection. Refer to

LAN-7, "Precautions for Harness

Repair"

.

2.

PERFORM SELF-DIAGNOSIS (AROUND VIEW MONITOR CONTROL UNIT)

With CONSULT

1.

Connect around view monitor control unit harness connector.

2.

Connect EPS control unit harness connector.

3.

Erase self-diagnostic results for “AVM”.

4.

Turn the ignition switch OFF, and then wait 10 seconds and more.

5.

Turn the ignition switch ON.

6.

Perform self-diagnosis for “AVM”.

Is any DTC detected?

DTC

Display item

(Trouble diagnosis content)

Malfunction detected condition

U1970

AROUND VIEW MONITOR
(Around view monitor)

CAN communication signal of around view monitor control unit is abnormal for 
2 consecutive seconds or more.

U1970 AROUND VIEW MONITOR SYSTEM

STC-37

< DTC/CIRCUIT DIAGNOSIS >

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YES

>> Check the DTC. Refer to 

AV-120, "DTC Index"

.

NO

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT

1.

Erase self-diagnostic results for “EPS/DAST 3”.

2.

Turn the ignition switch OFF, and then wait 10 seconds and more.

3.

Turn the ignition switch ON.

4.

Perform the self-diagnosis of all systems.

Is DTC “U1000”,“U1970” or other DTC detected?

YES (“U1000”)>>Refer to 

LAN-17, "Trouble Diagnosis Flow Chart"

.

YES (“U1970”)>>Replace around view monitor control unit. Refer to 

AV-268, "Removal and Installation"

.

YES (Other DTC)>>Check the DTC.
NO

>> INSPECTION END