2003 NISSAN ALMERA N16 flow

ENGINE CONTROL COMPONENT PARTS/CONTROL
SYSTEMS APPLICATION
=NJEC0629S02
ItemDIAGNOSTIC TEST MODE
SELF-DIAG
RESULTSDATA MONI-
TORACTIVE TEST
ENGINE CONTROL COMPONENT PARTS
INPUTEngine coolant temperature sensor X X
Vehicle speed sensor X X
Accelerator position sensor X X
Accelerator position switch X X
Crankshaft position sensor (TDC) X X
Ignition switch (start signal) X
Park/Neutral position (PNP) switch (where fitted) X
Battery voltage X X
Mass air flow sensor X X
Stop lamp switch X X
OUTPUTGlow relayXX
EGR volume control valve X X
Cooling fan relay X X X
X: Applicable
SELF-DIAGNOSTIC MODENJEC0629S03Regarding items detected in “SELF-DIAG RESULTS” mode,
refer to “TROUBLE DIAGNOSIS — INDEX”, EC-4.
DATA MONITOR MODENJEC0629S04
Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
CKPS·RPM (TDC)
[rpm]The engine speed computed from the
crankshaft position sensor (TDC) signal
is displayed.
CMPS·RPM·PUMP
[rpm]The engine speed computed from the
pulse signal sent from electronic control
fuel injection pump is displayed.
COOLAN TEMP/S
[°C] or [°F]The engine coolant temperature (deter-
mined by the signal voltage of the
engine coolant temperature sensor) is
displayed.When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.
VHCL SPEED SE
[km/h] or [mph]The vehicle speed computed from the
vehicle speed sensor signal is dis-
played.
FUEL TEMP SEN
[°C] or [°F]The fuel temperature (sent from elec-
tronic control fuel injection pump) is dis-
played.
ACCEL POS SEN
[V]The accelerator position sensor signal
voltage is displayed.
OFF ACCEL SW
[ON/OFF]Indicates [ON/OFF] condition from the
accelerator position switch signal.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONYD
CONSULT-II (Cont’d)
EC-40

Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
SPILL/V [°CA] The control position of spill valve (sent
from electronic control fuel injection
pump) is displayed.
BATTERY VOLT [V] The power supply voltage of ECM is
displayed.
P/N POSI SW*1
[ON/OFF] (where
fitted)Indicates [ON/OFF] condition from the
park/neutral position switch signal.
START SIGNAL
[ON/OFF]Indicates [ON/OFF] condition from the
starter signal.After starting the engine, [OFF] is dis-
played regardless of the starter signal.
BRAKE SW
[ON/OFF]Indicates [ON/OFF] condition from the
stop lamp switch signal.
BRAKE SW2
[ON/OFF]Indicates [ON/OFF] condition from the
brake pedal position switch signal.
IGN SW
[ON/OFF]Indicates [ON/OFF] condition from igni-
tion switch signal.
MAS AIR/FL SE [V] The signal voltage of the mass air flow
sensor is displayed.When the engine is stopped, a certain
value is indicated.
INT/A VOLUME [mg/] The intake air volume computed from
the mass air flow sensor signal is dis-
played.
F/CUT SIGNAL
[ON/OFF]The [ON/OFF] condition from decelera-
tion fuel cut signal (sent from electronic
control fuel injection pump) is displayed.
O F F ···F u e l i s c u t o ff .
O N ···F u e l i s n o t c u t o ff .
GLOW RLY
[ON/OFF]The glow relay control condition (deter-
mined by ECM according to the input
signal) is displayed.
COOLING FAN
[LOW/HI/OFF]Indicates the control condition of the
cooling fans (determined by ECM
according to the input signal).
LOW ... Operates at low speed.
HI ... Operates at high speed.
OFF ... Stopped.
BARO SEN [kPa] The barometric pressure (determined by
the signal voltage from the barometric
pressure sensor built into the ECM) is
displayed.
EGR VOL CON/V
[step]Indicates the EGR volume control value
computed by the ECM according to the
input signals.
The opening becomes larger as the
value increases.
*1: On models not equipped with park/neutral position (PNP) switch, “OFF”is always displayed regardless of gear shift position.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONYD
CONSULT-II (Cont’d)
EC-41

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

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,perform “TROUBLE DIAGNOSIS
FOR INTERMITTENT INCIDENT”,
EC-71.
*3 If the on board diagnostic system
cannot be performed, check main
power supply and ground circuit.Refer to “TROUBLE DIAGNOSIS
FOR POWER SUPPLY”, EC-72.
*4 If malfunctioning part cannot be
detected, perform “TROUBLE
DIAGNOSIS FOR INTERMIT-
TENT INCIDENT”, EC-71.
TROUBLE DIAGNOSIS — INTRODUCTIONYD
Work Flow
EC-46

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

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
OKINSPECTION END
NG GO TO 4.
4 CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK GO TO 5.
NG Repair or replace.
5 BLEED AIR FROM FUEL SYSTEM
1. Stop engine.
2. Use priming pump to bleed air from fuel system. Refer to “AIR BLEEDING”, EC-32.
GO TO 6.
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TROUBLE DIAGNOSIS — BASIC INSPECTIONYD
Basic Inspection (Cont’d)
EC-49

SYSTEM — ENGINE CONTROL system
Malfunction
SYMPTOM
Reference page
Feature of symptom, Check pointHARD/NO START/RESTART
(EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
KNOCK/DETONATION
LACK OF POWER
POOR ACCELERATION
HI IDLE
LOW IDLE NO START (with first firing)
NO START (without first firing)
HARD TO START WHEN ENGINE IS COLD
HARD TO START WHEN ENGINE IS HOT
AT IDLE
DURING DRIVING
WHEN DECELERATINGWarranty symptom code AA AB AC AD AE AF
ENGINE CONTROL
Electronic control fuel injection
pump circuit*a, *b 1 1
111111111
—
*c, *d
Mass air flow sensor circuit*a, *c
111
EC-78
*b
Engine coolant temperature sensor
circuit*a, *b 1 1 1 1 EC-84 *1
Vehicle speed sensor circuit *a, *b 1 EC-105
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
*a: Open
*b: Short
*c: Ground short
*d: Noise
*1: Compensation according to engine coolant temperature does not function.
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TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONYD
Symptom Matrix Chart (Cont’d)
EC-55

SYSTEM — ENGINE CONTROL system
Malfunction
SYMPTOM
Reference page
Feature of symptom, Check pointROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEAT/HIGH ENGINE COOLANT TEMPERATURE
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
ABNORMAL SMOKE COLOR
DEAD BATTERY (UNDER CHARGE)
Malfunction indicator illuminates.
Can be detected by CONSULT-II?BLACK SMOKE
WHITE SMOKEWarranty symptom code AG AH AJ AK AL AM AP HA
ENGINE CONTROL
Electronic control fuel injection pump
circuit*a, *b 1 1 1
11 —
*c, *d 1
Mass air flow sensor circuit*a, *c
1 EC-78
*b 1
Engine coolant temperature sensor cir-
cuit*a, *b 1 1 1 1 1 EC-84 *1
Vehicle speed sensor circuit *a, *b 1 EC-105
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
*a: Open
*b: Short
*c: Ground short
*d: Noise
*1: Compensation according to engine coolant temperature does not function.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONYD
Symptom Matrix Chart (Cont’d)
EC-56