1999 NISSAN PRIMERA sensor

TER-
MINAL
NO.WIRE
COLORITEM CONDITIOND ATA
(DC Voltage and
Pulse Signal)
344 WCrankshaft position sen-
sor (TDC) (Signal)Engine is running.
(Warm-up condition)
Idle speedApproximately 0V
NEF867
Engine is running.
Engine speed is 2,000 rpmApproximately 0V
NEF868
345 W Needle lift sensorEngine is running.
(Warm-up condition)
Idle speedApproximately 3.8 - 4.0V
NEF869
Engine is running.(Warm-up condition)
Engine speed is 2,000 rpmApproximately 3.8 - 4.0V
NEF870
347 L/BEngine coolant tempera-
ture sensorEngine is running.
0.6 - 4.8V
Output voltage varies
with engine coolant tem-
perature.
348
411R/Y Fuel temperature sensor
Engine is running.
0.6 - 4.8V
Output voltage varies
with fuel temperature.
349 SB Fuel cut solenoid valveIgnition switch ªLOCKº
Approximately 0V
Ignition switch ªONº
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS Ð General DescriptionCD20T
ECM Terminals and Reference Value (Cont'd)
EC-56

TER-
MINAL
NO.WIRE
COLORITEM CONDITIOND ATA
(DC Voltage and
Pulse Signal)
403 GY Air conditioner switchEngine is running.
Both air conditioner switch and blower
switch are ªONº (Compressor operates)Approximately 0V
Engine is running.
Air conditioner switch is ªOFFºBATTERY VOLTAGE
(11 - 14V)
405 R/G Stop lamp switchIgnition switch ªONº
Brake pedal released0V
Ignition switch ªONº
Brake pedal depressedBattery voltage
(11 - 14V)
410 ORImmobilizer communica-
tionIgnition switch ªONº
BATTERY VOLTAGE
(4 - 14V)
416 R/B Brake switch 2Ignition switch ªONº
Brake pedal releasedBattery voltage
(11 -14V)
Ignition switch ªONº
Brake pedal depressed0V
417 OR/WVehicle speed sensor or
ABS actuator and elec-
tric unit (control unit)Engine is running.
Lift up the vehicle.
In 2nd gear position
Vehicle speed is 40 km/h (25 mph)0 - Approximately 4.2V
SEF552S
420 BR/W
Data link connector for
CONSULT-IIEngine is running.
Idle speed (CONSULT-II is connected and
turned on)Approximately4-9V
415 G/RApproximately 0V
425 BRAccelerator position sen-
sor groundEngine is running.
Idle speedApproximately 0V
433 LG/WAccelerator position sen-
sor power supplyIgnition switch ªONº
Approximately 5V
434 W/PUAccelerator position sen-
sorIgnition switch ªONº
Accelerator pedal released0.4 - 0.6V
Ignition switch ªONº
Accelerator pedal fully depressedApproximately 4.0V
TROUBLE DIAGNOSIS Ð General DescriptionCD20T
ECM Terminals and Reference Value (Cont'd)
EC-57

Mass Air Flow Sensor (MAFS)
The mass air flow sensor measures the amount of intake air by
analysing a part of the entire flow. When intake air flows into the
intake manifold, heat is withdrawn from the hot film. By regulat-
ing the electrical current that flows through the hot film, the ECM
maintains the hot film temperature on a constant level. The
amount of electric current that is needed to keep the hot film on
a constant temperature level is proportional to the mass of air
that flows into the engine.
Malfunction is detected when...Check Items
(Possible Cause)
lAn excessively high or low voltage from the sensor is
entered to ECM.lHarness or connectors
(The sensor circuit is open or shorted.)
lMass air flow sensor
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and wait for at least 20 seconds.
NEF663
TROUBLE DIAGNOSIS 1CD20T
EC-62

YEC799
BATTERY
Refer to EL-POWER.: Detectable line for DTC
: Non-detectable line for DTC
ENGINE
CONTROL
MODULE
RELAYMASS AIR
FLOW SEN-
SOR
ECM
TROUBLE DIAGNOSIS 1CD20T
Mass Air Flow Sensor (MAFS) (Cont'd)
EC-63

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect mass air flow sensor harness
connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between mass air flow
sensor connector terminal
p2and
ground.
Voltage: Battery positive voltage
OK
ENG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass
air flow sensor connector terminal
p3and ECM connector terminal218.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or connec-
tors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass air
flow sensor connector terminal
p4and
ECM connector terminal223, mass air
flow sensor connector terminal
p5and
ECM connector terminal224.
Continuity should exist.
If OK, check harness for short.
OK
ENG
Repair harness or connec-
tors.
CHECK COMPONENT
(Mass air flow sensor).
Refer to ªCOMPONENT INSPECTIONº on
next page.
OK
ENG
Replace mass air flow sen-
sor.
Disconnect and reconnect harness connec-
tors in the circuits. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage or the
connection of ECM harness connector.
INSPECTION END
NEF788 Mass air flow sensor harness connector
NEF789
Mass air flow
sensor connector
NEF191A
Mass air
flow sensor
connector
NEF192A
Mass air flow sensor
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 1CD20T
Mass Air Flow Sensor (MAFS) (Cont'd)
EC-64

COMPONENT INSPECTION
Mass air flow sensor
1. Turn ignition switch to ªONº position.
2. Start engine and warm it up sufficiently.
3. Check voltage between mass air flow sensor connector ter-
minal
p5and ground.
Conditions Voltage V
Ignition switch ªONº position (Engine stopped.)Approximately 1.0
Idle (Engine is warmed-up sufficiently.)1.9 - 2.3
4. If NG, remove mass air flow sensor from air duct. Check hot
film for damage or dust.
NEF792 Mass air flow sensor
connector
NEF669
TROUBLE DIAGNOSIS 1CD20T
Mass Air Flow Sensor (MAFS) (Cont'd)
EC-65

Engine Coolant Temperature (ECT) Sensor
The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage sig-
nal 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
(V)Resistance
(kW)
þ10 (14)4.4 7.0 - 11.4
20 (68)3.5 2.1 - 2.9
50 (122)2.3 0.68 - 1.00
90 (194)1.0 0.236 - 0.260
Malfunction is detected when ...Check Items
(Possible Cause)
lAn excessively high or low voltage from the sensor is
entered to ECM.lHarness or connectors
(The sensor circuit is open or shorted.)
lEngine coolant temperature sensor
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
SEF594K
SEF012P
TROUBLE DIAGNOSIS 2CD20T
EC-66

YEC800
ENGINE COOLANT
TEMPERATURE
SENSOR
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 2CD20T
Engine Coolant Temperature (ECT) Sensor
(Cont'd)
EC-67