check engine NISSAN PRIMERA 1999 Electronic Manual Online

SYSTEM Ð Engine control module systemMalfunction
SYMPTOM
Reference page Feature of symptom
Check point
HARD/NO START/
RESTART (EXCP. HA) ENGINE STALL HESITATION/SURGING/FLAT SPOT SPARK KNOCK/DETONATION
LACK OF POWER
POOR ACCELERATION
HI IDLE
LOW IDLE
ROUGH 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?
Fuel cut
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 DECELERATINGBLACK SMOKE WHITE SMOKE
New CT/CS AA AB AC AD AE AF AG AH AJ AK AL AM AP HAEngine control moduleStart signal circuit open, shortqqEC-CD-145 Start control does not function.
Air conditioner switch circuitopen, ground short
EC-CD-126Air conditioner does not stop
operating.
shortAir conditioner does not work.
Accelerator position switch (Idle)
circuitopen, ground shortqq q qq
EC-CD-108
shortqqq qqAccelerator position sensor NG
signal is output.
Ignition switch circuit (ON signal)openq qqq
EC-CD-59
shortEngine does not stop.
Power supply for ECM circuitopenqqq
EC-CD-59
shortqq
EGRC-solenoid valve circuitopen, shortqq
EC-CD-129
ground shortqqqDoes not stop operating.
Glow relay circuitopenqqqq q qq
EC-CD-118Glow lamp does not turn on.
shortqqGlow lamp does not turn off.
Engine control module relay (Self-
shutoff) circuitopenqqqq
EC-CD-59
shortqq qGround short makes engine
unable to stop.
Air conditioner relay circuitopen
EC-CD-126Air conditioner does not oper-
ate.
shortqqAir conditioner does not stop
operating.
Brake switch circuitsopenq
EC-CD-136
shortq
ECM, Connector circuit open, shortqqqqqqqqqqqqq qqqqqqqqqqqqEC-CD-86
TROUBLE DIAGNOSIS Ð General DescriptionCD20T
Symptom Matrix Chart (Cont'd)
EC-49

INSPECTION START
Start engine.
Is engine running?
Ye s
ENo
CHECK POWER SUPPLY-I.
1. Disconnect ECM harness
connector.
2. Turn ignition switch to
ªONº position.
3. Check voltage between
ECM connector terminal
507and ground
Voltage: Battery voltage
If NG, check the following:
l10A fuselHarness connectorsM52,F103
lHarness for open or
short-circuit between
ECM and ignition switch.
If NG, replace 10A fuse or
repair harness or connec-
tors.
OK 1. Stop engine.
2. Disconnect ECM harness connector.
3. Turn ignition switch to ªONº position.F
CHECK POWER SUPPLY-II.
1. Short between ECM connector terminal
325and engine ground with a jump
wire.
2. Check voltage between ECM terminals
107,108,109and ground.
Voltage: Battery voltage
NG
EOK
Go toªCHECK
GROUND CIRCUITº on
page EC-CD-61.
CHECK HARNESS CONTINUITY
BETWEEN ENGINE CONTROL MODULE
RELAY AND ECM
Check harness continuity between ECM
connector terminals
107,108,109and
ECM relay connector terminal
p5.
Continuity should exist.
If OK, check harness for short.
OK
ENG
Check the following:
lHarness connectorsM89,F96
lHarness for open or
short-circuit between
ECM relay and ECM.
If NG, repair harness or
connectors.
pA
NEF863
YEC327 ECM relay
NEF186A
NEF187A
NEF188A
ECM relay
connector
H
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLYCD20T
Main Power Supply and Ground Circuit
(Cont'd)
EC-60

pA
CHECK VOLTAGE BETWEEN ENGINE
CONTROL MODULE RELAY AND
GROUND.
Check voltage between ECM relay connec-
tor terminals
p2,p3and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG
Check the following:
l15A fuselHarness for open or
short-circuit between
ECM relay and battery.
If NG, replace fuse or repair
harness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
Check harness continuity between ECM
connector terminal
325and ECM relay
connector terminal
p1.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENGlCheck harness connec-
torsE43,F2
Repair harness or connec-
tors.
CHECK ECM RELAY.
1. Apply 12V direct current between ECM
relay connector terminals
p1andp2.
2. Check continuity between engine control
module relay connector terminals
p3and
p5.
12V (
p1-p2) applied:
Continuity exists.
No voltage applied:
No continuity
OK
ENG
Replace ECM relay.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Check harness continuity between ECM
connector terminals
104,105,106
and engine ground.
Continuity should exist.
If resistance is too high, loosen, clean and
retighten engine ground.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or connec-
tors.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector.
INSPECTION END
YEC352 ECM relay
connector
NEF189A ECM relay
connector
YEC354 ECM relay
connector
NEF190A
NEF399 Engine ground
H
H
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLYCD20T
Main Power Supply and Ground Circuit
(Cont'd)
EC-61

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

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

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect engine coolant tempera-
ture sensor harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between engine cool-
ant temperature sensor connector
terminal
p2and ground with CON-
SULT-II or tester.
Voltage:
Approximately 4.9V
OK
ENG
Repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Check harness continuity between
engine coolant temperature sensor
connector terminal
p1and engine
ground.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
(Engine coolant temperature sensor).
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Replace engine coolant
temperature sensor.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
NEF401
.RH strut tower
.Engine coolant temperature
sensor harness connector
NEF193A
Engine coolant temperature
sensor connector
SEF542P
Engine coolant temperature
sensor connector
H
H
H
H
H
H
TROUBLE DIAGNOSIS 2CD20T
Engine Coolant Temperature (ECT) Sensor
(Cont'd)
EC-68

COMPONENT INSPECTION
Engine coolant temperature sensor
Check resistance as shown in the figure.
Temperature ÉC (ÉF) Resistance kW
20 (68)2.1 - 2.9
50 (122)0.68 - 1.0
90 (194)0.236 - 0.260
If NG, replace engine coolant temperature sensor.
SEF152P
SEF012P
TROUBLE DIAGNOSIS 2CD20T
Engine Coolant Temperature (ECT) Sensor
(Cont'd)
EC-69

Vehicle Speed Sensor (VSS)
Models with vehicle speed sensor
The vehicle speed sensor is installed in the transaxle. It contains
a pulse generator which provides a vehicle speed signal to the
speedometer. The speedometer then sends a signal to the ECM.
Models without vehicle speed sensor
The ABS actuator and electric unit (control unit) provides a
vehicle speed signal to the speedometer. The speedometer than
sends a signal to the ECM.
Malfunction is detected when ....Check Items
(Possible Cause)
lThe almost 0 km/h (0 mph) signal from vehicle speed sen-
sor or ABS actuator and electric unit (control unit) is sent
to ECM even when vehicle is being driven.Models with vehicle speed sensor
lHarness or connector
(The vehicle speed sensor circuit is open or shorted.)
lVehicle speed sensor
Models without vehicle speed sensor
lHarness or connector
(The ABS actuator and electric unit (control unit) is open or
shorted.)
lABS actuator and electric unit (control unit)
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the vehicle
speed sensor circuit. During this check, a DTC might not be
confirmed.
1) Jack up drive wheels.
2) Start engine.
3) Read vehicle speed sensor signal in ªDATA MONI-
TORº mode with CONSULT-II.
The vehicle speed on CONSULT-II should be able to
exceed 10 km/h (6 mph) when rotating wheels with
suitable gear position.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Jack up drive wheels.
2) Start engine.
3) Rotate drive wheel by hand.
4) Check voltage between ECM connector terminal
417and ground with voltage tester.
Voltage should vary between approx. 0 - 0.6V.
AEC110 Vehicle speed
sensor
PEF651U
NEF194A
TROUBLE DIAGNOSIS 3CD20T
EC-70

Control Sleeve Position Sensor (CSPS)
The control sleeve position sensor is installed on the electric
governor. It senses the position of control sleeve (rotor angle)
while the control sleeve is being driven by the electric governor,
and feeds it back to the ECM.
Malfunction is detected when ....Check Items
(Possible cause)
lAn excessively high or low voltage from the sensor is
detected by ECM.
...............................................................................................
lAn incorrect voltage signal from the sensor is detected by
ECM during engine running.
lHarness or connectors
(The control sleeve position sensor circuit is open or
shorted.)
lControl sleeve position sensor
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position and select ªDATA
MONITORº mode with CONSULT-II.
2) Start engine and run it for at least 2 seconds at idle
speed.
SEF641S Shaft
Sensor coil
NEF796
.Electronic injection pump
harness connector (control
sleeve position sensor)
TROUBLE DIAGNOSIS 4CD20T
EC-74