2003 NISSAN ALMERA N16 Engine control circuit

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

ACTIVE TEST MODENJEC0629S05
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
COOLING FANIgnition switch: ON
Operate the cooling fan at
“LOW”, “HI” speed and turn
“OFF” using CONSULT-II.Cooling fan moves at “LOW”, “HI”
speed and stops.Harness and connector
Cooling fan motor
Cooling fan relay
EGR VOL
CONT/VIgnition switch: ON
Change EGR volume control
valve opening step using CON-
SULT-II.EGR volume control valve makes
an operating sound.Harness and connector
EGR volume control valve
GLOW RLYIgnition switch: ON (Engine
stopped)
Turn the glow relay “ON” and
“OFF” using CONSULT-II and
listen to operating sound.Glow relay makes the operating
sound.Harness and connector
Glow relay
SEF373Y
SEF707X
REAL TIME DIAGNOSIS IN DATA MONITOR MODENJEC0629S06CONSULT-II has two kinds of triggers and they can be selected by
touching “SETTING” in “DATA MONITOR” mode.
1) “AUTO TRIG” (Automatic trigger):
The malfunction will be identified on the CONSULT-II screen in
real time.
In other words, DTC will be displayed if the malfunction is
detected by ECM.
At the moment a malfunction is detected by ECM, “MONITOR”
in “DATA MONITOR” screen is changed to “Recording Data ...
xx%” as shown at left, and the data after the malfunction detec-
tion is recorded. Then when the percentage reached 100%,
“REAL-TIME DIAG” screen is displayed. If “STOP” is touched
on the screen during “ Recording Data ... xx%”, “REAL-TIME
DIAG” screen is also displayed.
The recording time after the malfunction detection and the
recording speed can be changed by “TRIGGER POINT” and
“Recording Speed”. Refer to CONSULT-II OPERATION
MANUAL.
2) “MANU TRIG” (Manual trigger):
DTC will not be displayed automatically on CONSULT-II screen
even though a malfunction is detected by ECM.
DATA MONITOR can be performed continuously even though
a malfunction is detected.
Use these triggers as follows:
1) “AUTO TRIG”
While trying to detect the DTC by performing the “DTC Confir-
mation Procedure”, be sure to select to “DATA MONITOR
(AUTO TRIG)” mode. You can confirm the malfunction at the
moment it is detected.
While narrowing down the possible causes, CONSULT-II
should be set in “DATA MONITOR (AUTO TRIG)” mode, espe-
cially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twist-
ing) the suspicious connectors, components and harness in
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONYD
CONSULT-II (Cont’d)
EC-42

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

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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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

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
Fuel cut system line*a, *c
EC-124
*b 1 1 1 1 *2
Accelerator position sensor circuit *a, *b 1 1 1 EC-89
Crankshaft position sensor (TDC)
circuit*a, *b
111111111 EC-99
*d
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
*a: Open
*b: Short
*c: Ground short
*d: Noise
*2: Engine runs on after turning ignition switch OFF.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONYD
Symptom Matrix Chart (Cont’d)
EC-57

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
Fuel cut system line*a, *c 1 1
EC-124
*b*2
Accelerator position sensor circuit *a, *b 1 1 EC-89
Crankshaft position sensor (TDC) circuit*a, *b
1 1 1 1 EC-99
*d
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
*a: Open
*b: Short
*c: Ground short
*d: Noise
*2: Engine runs on after turning ignition switch OFF.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONYD
Symptom Matrix Chart (Cont’d)
EC-58

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
Start signal circuit *a, *b1111 EC-205*3
Accelerator position switch (Idle)
circuit*a, *c 1 1 1 1 1
EC-89
*b 1 1 1 *4
Ignition switch circuit*a 1 111
EC-72
*b*5
Power supply for ECM circuit*a 1 111
EC-72
*b
1 - 5: The numbers refer to the order of inspection.
(continued on next page)
*a: Open
*b: Short
*c: Ground short
*d: Noise
*3: Start control does not function.
*4: Accelerator position sensor NG signal is output.
*5: Engine does not stop.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONYD
Symptom Matrix Chart (Cont’d)
EC-59