Nissan Pathfinder. Manual — part 1125
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM
STC-17
< WIRING DIAGRAM >
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AAGIA0037GB
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< BASIC INSPECTION >
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
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
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
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
INFOID:0000000009177137
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)
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