Nissan March K13. Manual - part 635

ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM

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ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM

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DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000005912719

1.

OBTAIN INFORMATION ABOUT SYMPTOM

Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurs. 

>> GO TO 2.

2.

CHECK DTC

1.

Check DTC for “EPS” with CONSULT-III. 

2.

If a DTC exists, perform the following operations. 

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Records the DTCs.

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Erase DTCs

-

Check that the root cause clarified with DTC matches to the malfunction information described by the cus-
tomer. 

3.

Check also the related service information or others. 

Do malfunction information or DTC exist?

Malfunction information and DTC exist. >>GO TO 3.
Malfunction information exists but no DTC. >>GO TO 4.
No malfunction information, but DTC exists. >>GO TO 5.

3.

REPRODUCE THE MALFUNCTION INFORMATION

Check the malfunction described by the customer on the vehicle. 
Record the status of each signal when a symptom occurs with “DATA MONITOR” in “EPS” of CONSULT-III. 
Inspect the relation of the information and the condition when it occurs. 

>> GO TO 5.

4.

CHECK THE MALFUNCTION 

Check the malfunction described by the customer on the vehicle.
Record the status of each signal when a symptom occurs with “DATA MONITOR” in “EPS” of CONSULT-III. 
Inspect the relation of the information and the condition when it occurs. 

>> GO TO 6.

5.

PERFORM “DTC CONFIRMATION PROCEDURE”

Perform the “DTC conformation procedure” to the detected DTC and check that the DTC is detected again. 
Refer to 

STC-12, "DTC Inspection Priority Chart"

 when multiple DTCs are detected, and then judge the order

for performing the diagnosis. 

Is any DTC detected?

YES

>> GO TO 7.

NO

>> Follow 

GI-6, "How to Follow Test Groups in Trouble Diagnosis"

 to check. 

6.

IDENTIFY MALFUNCTIONING SYSTEM WITH “SYMPTOM DIAGNOSIS”

Use the “Symptom diagnosis” from the symptom inspection result in step 4. Then identify where to start per-
forming the diagnosis based on the possible causes and the symptoms. 

>> GO TO 7.

7.

IDENTIFY MALFUNCTIONING PARTS WITH “COMPONENT DIAGNOSIS”

Perform the inspection with the “component diagnosis” of the applicable system. 
NOTE:
The “component diagnosis” mainly consists of the check for an open circuit. 

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DIAGNOSIS AND REPAIR WORKFLOW

The circuit check in the diagnosis procedure also requires the check for a short circuit. Refer to 

GI-35, "Circuit

Inspection"

 for details. 

>> GO TO 8.

8.

REPAIR OR REPLACE THE MALFUNCTIONING PARTS

1.

Repair or replace the part detected as malfunctioning. 

2.

After repairing or replacing, reinstall/reconnect parts or connectors removed/disconnected in the “compo-
nent diagnosis”, and then erase the DTC. 

>> GO TO 9.

9.

FINAL CHECK

Perform the “DTC confirmation procedure” or “component Inspection” to check that the repair is correctly per-
formed. Check that malfunctions are not reproduced when obtaining the malfunction information from the cus-
tomer, referring to the symptom inspection result in step 3 or 4. 
Is the check result normal?

YES

>> Trouble diagnosis is completed.

NO-1

>> The DTC is reproduced. GO TO 7.

NO-2

>> The symptom is reproduced. GO TO 6.