Nissan March K13. Manual - part 638

U1000 CAN COMM CIRCUIT

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005912739

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 Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-27, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005912741

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

Perform “EPS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Refer to 

LAN-23, "CAN COMMUNICATION SYSTEM : CAN System Specification Chart"

.

NO

>> INSPECTION END

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

EPS control unit is not transmitting/re-
ceiving CAN communication signal for 2 
seconds or more.

• CAN communication error
• EPS control unit

STC-28

< DTC/CIRCUIT DIAGNOSIS >

EPS WARNING LAMP

EPS WARNING LAMP

Component Function Check

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1.

CHECK THE ILLUMINATION OF THE EPS WARNING LAMP

Check that the EPS warning lamp turns ON when ignition switch turns ON. Then, EPS warning lamp turns
OFF after the engine is started.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Perform trouble diagnosis. Refer to 

STC-28, "Diagnosis Procedure"

. 

Diagnosis Procedure

INFOID:0000000005912744

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS” self-diagnosis.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

STC-12, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK EPS WARNING LAMP SIGNAL

With CONSULT-III

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

2.

Select “DATA MONITOR” of “EPS” and select “WARNING LAMP” of “DATA MONITOR”

3.

Check that the EPS warning lamp is turned ON.

4.

Start the engine.

CAUTION:

Stop the vehicle.

5.

Check that the EPS warning lamp is turned OFF.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for combination meter power supply circuit. Refer to 

MWI-40,

"COMBINATION METER : Diagnosis Procedure"

.

NO

>> Replace the EPS control unit. Refer to 

STC-34, "Exploded View"

. 

EPS WARNING LAMP DOES NOT TURN ON

STC-29

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

EPS WARNING LAMP DOES NOT TURN ON

Description

INFOID:0000000005912745

EPS warning lamp does not turn ON when turning ignition switch ON from OFF. (Check the illumination of the
EPS warning lamp.)

Diagnosis Procedure

INFOID:0000000005912746

1.

CHECK EPS WARNING LAMP

Perform the trouble diagnosis of EPS warning Lamp. Refer to 

STC-28, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Repair or replace the specific malfunctioning part.

STC-30

< SYMPTOM DIAGNOSIS >

EPS WARNING LAMP DOES NOT TURN OFF

EPS WARNING LAMP DOES NOT TURN OFF

Description

INFOID:0000000005912747

EPS warning lamp does not turn OFF several seconds after engine started.

Diagnosis Procedure

INFOID:0000000005912748

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS” self-diagnosis.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

STC-12, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK EPS WARNING LAMP

Perform the trouble diagnosis of EPS warning Lamp. Refer to 

STC-28, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the specific malfunctioning part.

3.

CHECK EPS CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Perform the trouble diagnosis of EPS control unit power supply and ground. Refer to 

STC-19, "Diagnosis Pro-

cedure"

.

Is the inspection result normal?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Repair or replace the specific malfunctioning part.