Nissan Pathfinder. Manual - part 1125

HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM

STC-17

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DIAGNOSIS AND REPAIR WORK FLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000009177136

DETAILED FLOW

1.

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, perform an interview utilizing 

STC-19, "Diagnostic

Work Sheet"

 and reproduce symptoms to understand them fully. Ask customer about his/her complaints care-

fully. Check symptoms by driving vehicle with customer, if necessary.

CAUTION:

Customers are not professional. Never make assumptions like “maybe the customer means that...,” or

“maybe the customer mentioned 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-12,

"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“ of “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 malfunctioning system.

NOTE:

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

STC-

13, "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

DIAGNOSIS AND REPAIR WORK FLOW

STC-19

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YES

>> GO TO 6.

NO

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

6.

REPAIR OR REPLACE THE MALFUNCTIONING COMPONENTS.

• Repair or replace the malfunctioning components.

• Reconnect part or connector after repairing or replacing.

• When DTC is detected, erase self-diagnostic results for “EPS”.

>> GO TO 8.

7.

IDENTIFY THE MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Estimate the malfunctioning system based on symptom diagnosis and perform inspection.
Can the malfunctioning 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

†

Mountain road (uphill or down hill)

†

Rough road

STC-20

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORK FLOW

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)