Nissan Quest E52. Instruction — part 1182

DIAGNOSIS AND REPAIR WORK FLOW

STC-17

< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

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DETAILED FLOW

1.

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, perform an interview utilizing reproduce symptoms
as well as fully understand it. Ask customer about his/her complaints carefully. Check symptoms by driving
vehicle with customer, if necessary.

CAUTION:

Customers are not professional. Never guess easily like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK SYMPTOM

Reproduce the symptom that is indicated by the customer, based on the information from the customer
obtained by interview. Also check that the symptom is not caused by protection function. Refer to

STC-13,

"Protection Function"

.

CAUTION:

When the symptom is caused by normal operation, fully inspect each portion and obtain the under-
standing of customer that the symptom is not caused by a malfunction.

>> GO TO 3.

3.

CHECK VEHICLE CONDITION

With CONSULT

1.

Turn ignition switch ON.

2.

Check “C/U TEMP“ and “C/U TEMP A“ in “DATA MONITOR“ in “EPS“.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Wait with the ignition switch OFF until the data monitor indication becomes 90

°

C (194

°

F) or less.

Go to 4 after the temperature drops to 90

°

C (194

°

F) or less.

4.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis.

Is any DTC detected?

YES

>> Record or print DTC and freeze frame data (FFD). GO TO 5.

NO

>> GO TO 7.

5.

RECHECK SYMPTOM

With CONSULT

1.

Erase self-diagnostic results for “EPS”.

2.

Perform DTC confirmation procedures for the error detected system.

NOTE:
If some DTCs are detected at the same time, determine the order for performing the diagnosis based on

STC-

14, "DTC Inspection Priority Chart"

.

Is any DTC detected?

Monitor item

Values

C/U TEMP

90

°

C (194

°

F) or less

C/U TEMP A

90

°

C (194

°

F) or less

STC-18

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

YES

>> GO TO 6.

NO

>> Check harness and connectors based on the information obtained by interview.

6.

REPAIR OR REPLACE ERROR-DETECTED PARTS

• Repair or replace error-detected parts.
• Reconnect part or connector after repairing or replacing.
• When DTC is detected, erase self-diagnostic results for “EPS”.

>> GO TO 8.

7.

IDENTIFY ERROR-DETECTED SYSTEM BY SYMPTOM DIAGNOSIS

Estimate error-detected system based on symptom diagnosis and perform inspection.

Can the error-detected system be identified?

YES

>> GO TO 8.

NO

>> Check harness and connectors based on the information obtained by interview.

8.

FINAL CHECK

With CONSULT

1.

Check the reference value for power steering control module.

2.

Recheck the symptom and check that symptom is not reproduced on the same conditions.

Is the symptom reproduced?

YES

>> GO TO 3.

NO

>> INSPECTION END

Diagnostic Work Sheet

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Description

• In general, customers have their own criteria for a problem. Therefore, it is important to understand the

symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the interview sheet referring to the interview points.

• In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

Interview sheet sample

Interview sheet

Customer
name

MR/MS

Registration
number

Initial year
registration

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

Symptom

†

The steering wheel position (center) is in the wrong position.

†

Warning lamp turns on.

†

Noise

†

Vibration

†

Others

(

)

First occurrence

†

Recently

†

Others (

)

Frequency of occurrence

†

Always

†

Under a certain conditions of

†

Sometimes (time(s)/day)

Climate con-
ditions

†

Irrelevant

Weather

†

Fine

†

Cloud

†

Rain

†

Snow

†

Others (

)

Temperature

†

Hot

†

Warm

†

Cool

†

Cold

†

Temperature [Approx.

°

C (

°

F)]

Relative humidity

†

High

†

Moderate

†

Low

Road conditions

†

Urban area

†

Suburb area

†

High way

†

Mounting road (uphill or down hill)

†

Rough road

DIAGNOSIS AND REPAIR WORK FLOW

STC-19

< BASIC INSPECTION >

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Operation conditions, etc.

†

Irrelevant

†

When engine starts

†

During idling

†

During driving

†

During acceleration

†

At constant speed driving

†

During deceleration

†

During cornering (right curve or left curve)

†

During steering

Other conditions

Memo

Interview sheet

Customer
name

MR/MS

Registration
number

Initial year
registration

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

STC-20

< DTC/CIRCUIT DIAGNOSIS >

C1143 STEERING ANGLE SENSOR

DTC/CIRCUIT DIAGNOSIS

C1143 STEERING ANGLE SENSOR

DTC Logic

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DTC DETECTION LOGIC

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” self-diagnosis.

Is DTC “C1143” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-20, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

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1.

CHECK STEERING ANGLE SENSOR CIRCUIT

Check steering angle sensor circuit. Refer to

BRC-82, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK TERMINALS AND HARNESS CONNECTORS

Check the power steering control module pin terminals for damage or loose connection with harness connec-
tor.

Is the inspection result normal?

YES

>> Power steering control module is malfunctioning. Replace power steering oil pump assembly.

Refer to

ST-32, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1143

ST ANG SEN CIRCUIT

When a malfunction is detected in steering angle
sensor.

• Harness or connector
• Steering angle sensor
• Power steering control mod-

ule