2003 NISSAN ALMERA N16 Electronic Repair Manual

drain bolt traction control AUX load capacity open hood airbag disable

Page 1097 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual the “DTC Confirmation Procedure”, the moment a malfunction
is found the DTC will be displayed. Refer to GI-23, “Incident
Simulation Tests”.
2) “MANU TRIG”
If the malfunction is displayed a

Page 1098 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual SEF858S
Introduction
SEF233G
SEF234G
NJEC0630The engine has an ECM to control major systems such as fuel
injection control, fuel injection timing control, glow control system,
etc. The ECM accepts inp

SEF858S
Introduction
SEF233G
SEF234G
NJEC0630The engine has an ECM to control major systems such as fuel
injection control, fuel injection timing control, glow control system,
etc. The ECM accepts input signals from sensors and instantly
drives electronic control fuel injection pump. It is essential that both
input and output signals are proper and stable. At the same time,
it is important that there are no malfunctions such as vacuum leaks,
or other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs inter-
mittently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only may not find the cause of the malfunctions. A
road test with CONSULT-II or a circuit tester connected should be
performed. Follow the “Work Flow”, EC-46.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” like the
example on next page should be used.
Start your diagnosis by looking for “conventional” malfunctions first.
This will help troubleshoot driveability incidents on an electronically
controlled engine vehicle.
SEF907L
DIAGNOSTIC WORKSHEETNJEC0630S01There are many operating conditions that lead to the malfunction
of engine components. A good grasp of such conditions can make
troubleshooting 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
customer complaint.
Utilize a diagnostic worksheet like the one shown below in order to
organize all the information for troubleshooting.
TROUBLE DIAGNOSIS — INTRODUCTIONYD
Introduction
EC-44

Page 1099 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual Worksheet SampleNJEC0630S0101
MTBL0533
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TROUBLE DIAGNOSIS — INTRODUCTIONYD
Introduction (Cont’d)
EC-45

Page 1100 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual Work FlowNJEC0631
YEC400A
*1 If time data of “SELF-DIAG
RESULTS” is other than “0”, per-
form “TROUBLE DIAGNOSIS
FOR INTERMITTENT INCIDENT”,
EC-71.
*2 If the incident cannot be verified,pe

Page 1101 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual DESCRIPTION FOR WORK FLOW=NJEC0631S01
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using
the “DIAGNOSTIC WORKSHEET”,

DESCRIPTION FOR WORK FLOW=NJEC0631S01
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using
the “DIAGNOSTIC WORKSHEET”, EC-44.
STEP IIBefore confirming the concern, check and write down (print out using CONSULT-II) the DTC, then erase the
DTC. Refer to EC-34.
If the incident cannot be verified, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
Study the relationship between the cause, specified by DTC, and the symptom described by the customer. (The
“Symptom Matrix Chart” will be useful. Refer to EC-53.) Also check relatedservice bulletins for information.
STEP IIITry to confirm the symptom and under what conditions the incident occurs.
The “DIAGNOSTIC WORK SHEET” is 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 “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
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
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 “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
In case the “DTC Confirmation Procedure” is not available, perform the “Overall Function Check” instead. The
DTC cannot be displayed by this check, however, this simplified “check” isan 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 DTCPXXXX.
If the normal code is indicated, proceed to the Basic Inspection, EC-48. Then perform inspections according to
the Symptom Matrix Chart. Refer to EC-53.
STEP VIIdentify where to begin diagnosis based on the relationship study betweensymptom 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 CON-
SULT-II. Refer to EC-66 or EC-63.
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-25, “Circuit
Inspection”.
Repair or replace the malfunction parts.
If the malfunctioning part cannot be detected, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT”, EC-71.
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 (DTCP0000 or 0505) 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-34.)GI
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TROUBLE DIAGNOSIS — INTRODUCTIONYD
Work Flow (Cont’d)
EC-47

Page 1102 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual Basic InspectionNJEC0632Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;
Headlamp switch is OFF,
On vehicles equipped with daytime light systems, set
lighting switc

Page 1103 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual 3 CHECK IDLE SPEED
With CONSULT-II
1. Select “CKPS·RPM (TDC)” in “DATA MONITOR” mode with CONSULT-II.
2. Read idle speed.
SEF817Y
Without CONSULT-II
Check idle speed.
725±25 rpm
OK or NG
OKI

Page 1104 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual 6 CHECK IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and let it idle.
2. Select “CKPS·RPM (TDC)” in “DATA MONITOR” mode with CONSULT-II.
3. Read idle speed.
SEF817Y
Without CONSULT-II
1.

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