1999 NISSAN PRIMERA lights

Component DescriptionNCEC0072The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the
engine coolant temperature input. The sensor uses a thermistor
which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.

Engine coolant temperature
ÉC (ÉF)Voltage*
VResistance
kW
þ10 (14)4.4 7.0 - 11.4
20 (68)3.5 2.1 - 2.9
50 (122)2.2 0.68 - 1.00
90 (194)0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminal 70
(Engine coolant temperature sensor) and ECM terminal 48 (ECM ground).
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0073
MONITOR ITEM CONDITION SPECIFICATION
COOLAN TEMP/SIEngine: After warming up More than 70ÉC (158ÉF)
On Board Diagnosis LogicNCEC0074
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0115
0115IAn excessively high or low voltage from the sensor is
sent to ECM.*IHarness or connectors
(The sensor circuit is open or shorted.)
IEngine coolant temperature sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
Detected items Engine operating condition in fail-safe mode
Engine coolant tempera-
ture sensor circuitEngine coolant temperature will be determined by ECM based on the time after turning ignition switch
ªONº or ªSTARTº.
CONSULT-II displays the engine coolant temperature decided by ECM.
ConditionEngine coolant temperature decided (CONSULT-II
display)
Just as ignition switch is turned ON or Start 40ÉC (104ÉF)
More than approx. 4 minutes after ignition ON or
Start80ÉC (176ÉF)
Except as shown above40 - 80ÉC (104 - 176ÉF)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates
while the engine is running.
SEF594K
SEF012P
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)SR20DE
Component Description
EC-132

ECM Terminals and Reference Value=NCEC0081Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
58 B Sensors' ground[Engine is running]
IWarm up condition
IIdle speedApproximately 0V
92 Y Throttle position sensor[Engine is running]
IAccelerator pedal fully released0.35 - 0.65V
[Ignition switch ªONº]
IAccelerator pedal fully depressedApproximately 4.0V
111 G Sensors' power supply[Ignition switch ªONº]Approximately 5V
On Board Diagnosis LogicNCEC0082
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0120
0120An excessively low or high voltage from the sensor is
sent to ECM while driving*.IHarness or connectors
(The throttle position sensor circuit is open or
shorted.)
IThrottle position sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
Detected items Engine operating condition in fail-safe mode
Throttle position sensor
circuitThrottle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.
Condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration
DTC Confirmation ProcedureNCEC0083NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
IBefore performing the following procedure, confirm that
battery voltage is more than 10V at idle.
IThis test may be conducted with the drive wheels lifted in
the shop or by driving the vehicle. If a road test is
expected to be easier, it is unnecessary to lift the vehicle.
DTC P0120 THROTTLE POSITION SENSORSR20DE
ECM Terminals and Reference Value
EC-138

On Board Diagnosis LogicNCEC0188With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1 (front).
The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MI (2 trip detection logic).
Sensor Input Signal to ECMECM func-
tionActuator
Heated oxygen sensor 1 (front)Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injec-
tion & mix-
ture ratio
controlInjectors
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0171
0171IFuel injection system does not operate properly.
IThe amount of mixture ratio compensation is too large.
(The mixture ratio is too lean.)IIntake air leaks
IHeated oxygen sensor 1 (front)
IInjectors
IExhaust gas leaks
IIncorrect fuel pressure
ILack of fuel
IMass air flow sensor
DTC Confirmation ProcedureNCEC0189NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
IAlways perform at a temperature above þ10ÉC (14ÉF).
With CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch ªOFFº and wait at least 9 seconds.
3) Turn ignition switch ªONº and select ªSELF-LEARN CON-
TROLº in ªWORK SUPPORTº mode with CONSULT-II.
4) Clear the self-learning control coefficient by touching ªCLEARº.
5) Select ªDATA MONITORº mode with CONSULT-II.
6) Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0171 should be detected at this stage, if a
malfunction exists. If so, go to ªDiagnostic Procedureº, EC-SR-
214.
7) If it is difficult to start engine at step 6, the fuel injection sys-
tem has a malfunction.
8) Crank engine while depressing accelerator pedal. If engine
starts, go to ªDiagnostic Procedureº, EC-SR-214. If engine
does not start, visually check for exhaust and intake air leak.
With GST
Follow the procedure ªWith CONSULT-IIº above.
SEF652Y
SEF058Y
SEF203X Mass air flow sensor
harness connector
Air cleaner
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
(LEAN SIDE)SR20DE
On Board Diagnosis Logic
EC-212

On Board Diagnosis LogicNCEC0192With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1 (front).
The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the
ECM judges the condition as a fuel injection system malfunction and lights up the MI (2 trip detection logic).
Sensor Input Signal to ECMECM func-
tionActuator
Heated oxygen sensor 1 (front)Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injec-
tion & mix-
ture ratio
controlInjectors
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0172
0172IFuel injection system does not operate properly.
IThe amount of mixture ratio compensation is too large.
(The mixture ratio is too rich.)IHeated oxygen sensor 1 (front)
IInjectors
IExhaust gas leaks
IIncorrect fuel pressure
IMass air flow sensor
DTC Confirmation ProcedureNCEC0193NOTE:
If ªDTC Confirmation Procedure º has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
IAlways perform at a temperature above þ10ÉC (14ÉF).
With CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch ªOFFº and wait at least 9 seconds.
3) Turn ignition switch ªONº and select ªSELF-LEARN CON-
TROLº in ªWORK SUPPORTº mode with CONSULT-II.
4) Clear the self-learning control coefficient by touching ªCLEARº.
5) Select ªDATA MONITORº mode with CONSULT-II.
6) Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0172 should be detected at this stage, if a
malfunction exists. If so, go to ªDiagnostic Procedureº, EC-SR-
221.
7) If it is difficult to start engine at step 6, the fuel injection sys-
tem has a malfunction.
8) Crank engine while depressing accelerator pedal. If engine
starts, go to ªDiagnostic Procedureº, EC-SR-221. If engine
does not start, remove ignition plugs and check for fouling, etc.
SEF652Y
SEF058Y
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
(RICH SIDE)SR20DE
On Board Diagnosis Logic
EC-218

Fuel Pressure RegulatorNCEC0467
Fuel pressure at idling
kPa (bar, kg/cm2, psi)Vacuum hose is connected Approximately 235 (2.35, 2.4, 34)
Vacuum hose is disconnected Approximately 294 (2.94, 3.0, 43)
Idle Speed and Ignition TimingNCEC0468
Target idle speed*1 rpm No-load*3 (in ªPº or ªNº position) 750 50
Air conditioner: ON rpm In ªPº or ªNº position 825 or more
Ignition timing*2 In ªPº or ªNº position 15É 2É BTDC
Throttle position sensor idle position V0.35 - 0.65
*1: Throttle position sensor harness connector connected
*2: Throttle position sensor harness connector disconnected
*3: Under the following conditions:
IAir conditioner switch: OFF
IElectrical load: OFF (Lights, heater fan & rear window defogger)
ISteering wheel: Kept in straight-ahead position
Ignition CoilNCEC0574
Primary voltage VBattery voltage (11 - 14)
Primary resistance [at 25ÉC (77ÉF)] kW2.2
Secondary resistance [at 25ÉC (77ÉF)] kWApproximately 17
Mass Air Flow SensorNCEC0470
Supply voltage (Heater) VBattery voltage (11 - 14)
Supply voltage (Sensor) VApproximately 5
Output voltage V1.3 - 1.7*
Mass air flow
(Using CONSULT-II or GST) g×m/sec2.5 - 5.0 at idle*
7.1 - 12.5 at 2,500 rpm*
*: Engine is warmed up to normal operating temperature and idling under no-load.
Engine Coolant Temperature SensorNCEC0471
Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Fuel PumpNCEC0473
Resistance [at 25ÉC (77ÉF)]W0.2 - 5.0
IACV-AAC ValveNCEC0474
Resistance [at 20ÉC (68ÉF)]W
Between terminals1-2,2-3,4-5and5-620-24
InjectorNCEC0475
Resistance [at 25ÉC (77ÉF)]W13.5 - 17.5
SERVICE DATA AND SPECIFICATIONS (SDS)
Fuel Pressure Regulator
EC-330

System Description
The auto level control unit is designed to adjust the beam angle of the headlamp in response to the load-
ing conditions of the vehicle. It is not designed to compensate for the dynamic handling of the vehicle.
The vehicle’s front and rear height is measured by sensors attached to the front stabilizer bar and the rear
suspension lateral link arm. The sensors provide a signal to the auto level control unit, which calculates the
correct headlamp aiming position and sends a signal to the aiming motors.
Initialisation
After the replacement or adjustment of any suspension sensor, the system must be self calibrated. This is
achieved as follows.
The vehicle must be empty, since any load will result in an invalid calibration. From outside of the vehicle
turn ignition on and then within 7 seconds the light switch must be turned from off to side lights on position,
5 times, finishing with the lamps in the on position.
The headlamps will then move to the highest, then the lowest then the normal position to indicate that the
calibration is successful, as can be seen by the moving beam pattern.
After successful calibration the headlamps must then be aimed in the conventional manner. Refer to EL-70.
HEADLAMP—Headlamp Aiming Control (Auto)—
EL-91

System Description
NATS has the following immobiliser functions:

This version of NATS has dongle unit to improve its anti-theft performance (RHD models for Europe).
Dongle unit has its own ID which is registered into NATS IMMU. So if dongle unit is replaced, initializa-
tion must be carried out.

When malfunction of dongle unit is detected:
The security indicator lamp illuminates for about 15 minutes after ignition switch is turned to ON.
When dongle unit has a malfunction, and the indicator lamp is illuminated, engine can not be started.
However engine can be started only one time when security indicator lamp turns off in about 15 minutes
after ignition switch is turned to ON.

Since only NATS ignition keys, whose ID nos. have been registered into the ECM and IMMU of NATS,
allow the engine to run, operation of a stolen vehicle without a NATS registered key is prevented by
NATS.
That is to say, NATS will immobilize the engine if someone tries to start it without the registered key of
NATS.

All of the originally supplied ignition key IDs have been NATS registered.
If requested by the vehicle owner, a maximum of five key IDs can be registered into the NATS compo-
nents.

The NATS security indicator (NATS security ind.) blinks when the ignition switch is in“OFF”or“ACC”
position. Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system.

When NATS detects trouble, the security indicator lamp lights up as follows.
Condition IGN ON andWith dongle Without dongle
MIL Security indicator MIL Security indicator
NATS malfunction
(except dongle unit) is
detected—6 times blinking
Staying ON after igni-
tion switch is turned
ON—Staying ON
Only malfunction of
dongle unit is detected.—Staying ON for about
15 minutes after igni-
tion switch is turned
ON——
Malfunction of NATS
and engine related
parts are detected.Staying ON6 times blinking
Staying ON after igni-
tion switch is turned
ONStaying ON Staying ON
Only engine related
part malfunction is
detected.Staying ON—Staying ON—
Just after initialization
of NATS—6 times blinking——

NATS trouble diagnoses, system initialisation and additional registration of other NATS ignition key IDs
must be carried out using CONSULT-II hardware and CONSULT-II NATS software.
Regarding the procedures of NATS initialisation and NATS ignition key ID registration, refer to CON-
SULT-II operation manual, NATS.

When servicing a malfunction of the NATS (indicated by lighting up of security Indicator Lamp)
or registering another NATS ignition key ID no., it may be necessary to re-register original key
identification. Therefore, be sure to receive all keys and the PIN code from vehicle owner.
NATS (Nissan Anti-Theft System)
EL-345

SYMPTOM MATRIX CHART 1
(Self-diagnosis related item)
SYMPTOMDisplayed“SELF-DIAG
RESULTS”on
CONSULT-II screenDIAGNOSTIC
PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)REFERENCE PART
NO. OF ILLUSTRATION
ON NEXT PAGE

Security indicator
lighting up*

Engine does not startECM INT CIRC-IMMUPROCEDURE 1
(EL-352)ECM B

Security indicator
lighting up*

Engine does not startCHAIN OF ECM-IMMUPROCEDURE 2
(EL-353)Open circuit in battery voltage
line of IMMU circuitC1
Open circuit in ignition line of
IMMU circuitC2
Open circuit in ground line of
IMMU circuitC3
Open circuit in communication
line between IMMU and ECMC4
Short circuit between IMMU and
ECM communication line and bat-
tery voltage lineC4
Short circuit between IMMU and
ECM communication line and
ground lineC4
ECM B
IMMU A
DIFFERENCE OF KEYPROCEDURE 3
(EL-355)Unregistered key D
IMMU A
CHAIN OF IMMU-KEYPROCEDURE 4
(EL-356)Malfunction of key ID chip E
IMMU A
Open circuit in ground line of
dongle circuitC6
Open or short circuit in communi-
cation line between IMMU and
dongle unitC5
Dongle control unit G
ID DISCORD, IMM-ECMPROCEDURE 5
(EL-358)System initialisation has not yet
been completed.F
ECM B
LOCK MODEPROCEDURE 7
(EL-361)LOCK MODE D

MI staying ON
Security indicator
lighting up*DON’T ERASE
BEFORE CHECKING
ENG DIAGWORK FLOW
(EL-349)Engine trouble data and NATS
trouble data have been detected
in ECM.—
*: When NATS detects trouble, the security indicator lights up while ignition key is in the“ON”position.
*: When the vehicle is equipped with dongle unit (RHD models for Europe), the security indicator blinks 6 times just after ignition switch is turned
to ON. Then the security indicator lights up while ignition key is in the“ON”position.
NATS (Nissan Anti-Theft System)
Trouble Diagnoses (Cont’d)
EL-350