2003 NISSAN X-TRAIL Service Repair Manual

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NISSAN X-TRAIL 2003 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-1223
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ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
DTC and MI Detection LogicEBS011X8
When a malfunction is detected

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NISSAN X-TRAIL 2003 Service Repair Manual EC-1224
[YD (WITHOUT EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM

NATS (Nissan Anti-theft System)EBS011XB
If the security indicator lights up with the ignition switch in
the ON position or "NATS MAL

EC-1224
[YD (WITHOUT EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM

NATS (Nissan Anti-theft System)EBS011XB
If the security indicator lights up with the ignition switch in
the ON position or "NATS MALFUNCTION" is displayed on
"SELF-DIAG RESULTS" screen, perform self-diagnostic
results mode with CONSULT-II using NATS program card.
Refer to NATS (Nissan Anti-Theft System) in BL section.
Confirm no self-diagnostic results of NATS is displayed
before touching "ERASE" in "SELF-DAIG RESULTS" mode
with CONSULT-II.
When replacing ECM, initialization of NATS system and reg-
istration of all NATS ignition key IDs must be carried out
with CONSULT-II using NATS program card.
Therefore, be sure to receive all keys from vehicle owner.
Regarding the procedure of NATS initialization and NATS ignition key ID registration, refer to CON-
SULT-II operation manual, NATS.
Malfunction Indicator (MI)EBS011XC
DESCRIPTION
The MI is located on the instrument panel.
1. The MI will light up when the ignition switch is turned ON without
the engine running. This is a bulb check.
If the MI does not light up, refer to DI-33, "WARNING LAMPS"
or see EC-1498 .
2. When the engine is started, the MI should go off.
If the MI remains on, the on board diagnostic system has
detected an engine system malfunction.
On Board Diagnostic System Function
The on board diagnostic system has the following two functions.
Diagnostic Test Mode I - Bulb Check
In this mode, the MI on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to DI-33,
"WARNING LAMPS" or see EC-1498 .
Diagnostic Test Mode I - Malfunction Warning
SEF543X
SAT652J
Diagnostic Test
ModeKEY and ENG.
Sta tusFunction Explanation of Function
Mode I Ignition switch in
ON position
Engine stoppedBULB CHECK This function checks the MI bulb for damage (blown, open
circuit, etc.).
If the MI does not come on, check MI circuit. (See EC-
1498, "MI & DATA LINK CONNECTORS" .)
Engine running MALFUNCTION
WARNINGThis is a usual driving condition. When ECM detects a mal-
function, the MI will light up to inform the driver that a mal-
function has been detected.
MI Condition
ON When the malfunction is detected or the ECM's CPU is malfunctioning.
OFF No malfunction.

Page 1603 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-1225
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Relationship Between MI, DTC, CONSULT-II and Driving Patterns
*1: When a malfunction is detected, MI
will

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NISSAN X-TRAIL 2003 Service Repair Manual EC-1226
[YD (WITHOUT EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM

Driving Pattern A
The counter will be cleared when the malfunction is detected regardless of (1) - (4).
The counter will be counted

Page 1605 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual TROUBLE DIAGNOSIS
EC-1227
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TROUBLE DIAGNOSISPFP:00004
Trouble Diagnosis IntroductionEBS011XD
INTRODUCTION
The engine has an ECM to control major syst

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NISSAN X-TRAIL 2003 Service Repair Manual EC-1228
[YD (WITHOUT EURO-OBD)]
TROUBLE DIAGNOSIS

WORK FLOW
*1 If time data of “SELF-DIAG
RESULTS” is other than “0”, per-
form EC-1260, "
TROUBLE DIAG-
NOSIS FOR INTERMITTENT
INCIDENT" .

Page 1607 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual TROUBLE DIAGNOSIS
EC-1229
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Description for Work Flow
DIAGNOSTIC WORK SHEET
There are many operating conditions that lead to the malfunction of
engine

TROUBLE DIAGNOSIS
EC-1229
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Description for Work Flow
DIAGNOSTIC WORK SHEET
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one shown below in order to
organize all the information for troubleshooting.
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using the
EC-1229, "
DIAGNOSTIC WORK SHEET" .
STEP IIBefore confirming the concern, check and write down (print out using CONSULT-II) the DTC and the freeze frame
data, then erase the DTC. The DTC and the freeze frame data can be used when duplicating the incident at STEP III
& IV. Refer to EC-1223
.
If the incident cannot be verified, perform EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
Study the relationship between the cause, specified by DTC, and the symptom described by the customer. (The
Symptom Matrix Chart will be useful. Refer toEC-1235
) Also check related service bulletins for information.
STEP IIITry to confirm the symptom and under what conditions the incident occurs.
The DIAGNOSTIC WORK SHEET and the freeze frame data are useful to verify the incident. Connect CONSULT-II to
the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IVTry to detect the DTC by driving in (or performing) the DTC Confirmation Procedure. Check and read the DTC and the
freeze frame data by using CONSULT-II.
During the DTC verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode
and check real time diagnosis results.
If the incident cannot be verified, perform EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
In case the DTC Confirmation Procedure is not available, perform the Overall Function Check instead. The DTC can-
not be displayed by this check, however, this simplified check is an effective alternative.
The “NG” result of the Overall Function Check is the same as the DTC detection.
STEP VTake the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to Trouble Diagnosis for DTC PXXXX.
If the normal code is indicated, proceed to the Basic Inspection, EC-1231
. Then perform inspections according to the
Symptom Matrix Chart. Refer to EC-1235
.
STEP VIIdentify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the
system for mechanical binding, loose connectors or wiring damage using (tracing) Harness Layouts.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR (AUTO
TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT-II.
Refer to EC-1245
or EC-1257 .
The Diagnostic Procedure in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to GI-23, "
How to Per-
form Efficient Diagnosis for an Electrical Incident" , “Circuit Inspection”.
Repair or replace the malfunction parts.
If the malfunctioning part cannot be detected, perform EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT" .
STEP VIIOnce you have repaired the circuit or replaced a component, you need to run the engine in the same conditions and
circumstances which resulted in the customer's initial complaint.
Perform the DTC Confirmation Procedure and confirm the normal code (DTC P0000) is detected. If the incident is still
detected in the final check, perform STEP VI by using a different method from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) DTC in ECM. (Refer to
EC-1223
.)
SEF907L

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NISSAN X-TRAIL 2003 Service Repair Manual EC-1230
[YD (WITHOUT EURO-OBD)]
TROUBLE DIAGNOSIS

Worksheet Sample
DTC Inspection Priority ChartEBS012AT
If some DTCs are displayed at the same time, perform inspections one by one based on the foll

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