check engine NISSAN PRIMERA 1999 Electronic Repair Manual

TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
36*1 G Ignition check[Engine is running]
IWarm-up condition
IIdle speedApproximately 13V
SEF998V
[Engine is running]
IEngine speed is 2,000 rpmApproximately 12V
SEF999V
40 YThrottle position switch
(Closed position)[Engine is running]
IAccelerator pedal releasedBATTERY VOLTAGE
(11 - 14V)
[Ignition switch ªONº]
IAccelerator pedal depressedApproximately 0V
41 B/Y Start signal[Ignition switch ªONº]Approximately 0V
[Ignition switch ªSTARTº]9 - 12V
42 G/OR PNP switch[Ignition switch ªONº]
IGear position is ªNeutral positionº (M/T mod-
els)
IGear position is ªPº or ªNº (CVT models)Approximately 0V
[Ignition switch ªONº]
IExcept the above gear positionBATTERY VOLTAGE
(11 - 14V)
43 B/R Ignition switch[Ignition switch ªOFFº]0V
[Ignition switch ªONº]BATTERY VOLTAGE
(11 - 14V)
44 Ð Air conditioner switch[Engine is running]
IBoth air conditioner switch and blower switch
are ªONº (Compressor operates)Approximately 0V
[Engine is running]
IAir conditioner switch is ªOFFºApproximately 5V
46 PU/WPower steering oil pres-
sure switch[Engine is running]
ISteering wheel is fully turnedApproximately 0V
[Engine is running]
ISteering wheel is not turnedApproximately 5V
48 B ECM ground[Engine is running]
IIdle speedEngine ground
(Probe this terminal with (þ)
tester probe when measuring)
50 R Electric load signal[Engine is running]
IHeadlamp switch or rear window defogger
switch is ªONºBATTERY VOLTAGE
(11 - 14V)
*1: If so equipped
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTIONSR20DE
ECM Terminals and Reference Value (Cont'd)
EC-106

TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
86 OR/WVehicle speed sensor or
ABS actuator and elec-
tric unit (control unit)[Engine is running]
ILift up the vehicle
IIn 2nd gear position
IVehicle speed is 40 km/h (25 MPH)Approximately 2.5V
SEF976W
91 PU/Y CVT check signal[Engine is running]
IIdle speed0 - Approximately 5V
93*1 G/R Data link connector[Engine is running]
lIdle speed (CONSULT-II or GST is discon-
nected)Approximately 0V
101
103
105
107R/B
Y/B
G/B
L/BInjector No. 1
Injector No. 2
Injector No. 3
Injector No. 4[Engine is running]
IWarm-up condition
IIdle speedBATTERY VOLTAGE
(11 - 14V)
SEF011W
[Engine is running]
IWarm-up condition
IEngine speed is 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
SEF012W
106
108B/Y ECM ground[Engine is running]
IIdle speed0V
11 0
11 2R
RPower supply for ECM[Ignition switch ªONº]BATTERY VOLTAGE
(11 - 14V)
111 G Sensors' power supply[Ignition switch ªONº]Approximately 5V
114*1 G/W Adjust switch[Engine is running]
IIdle speed0V
115 BR/W Data link connector[Engine is running]
IIdle speed (CONSULT-II or GST is discon-
nected)0 - 10V
11 6Refer to
EL
sectionImmobilizer[Engine is running]
IIdle speedBATTERY VOLTAGE
(11 - 14V)
*1: If so equipped
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTIONSR20DE
ECM Terminals and Reference Value (Cont'd)
EC-109

ECM TERMINALS AND REFERENCE VALUENCEC0048Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
31 W/G ECM relay (Self shut-off)[Engine is running]
[Ignition switch ªOFFº]
IFor 9 seconds after turning ignition switch ªOFFº0-1V
[Ignition switch ªOFFº]
I9 seconds passed after turning ignition switch
ªOFFºBATTERY VOLTAGE
(11 - 14V)
43 B/R Ignition switch[Ignition switch ªOFFº]0V
[Ignition switch ªONº]BATTERY VOLTAGE
(11 - 14V)
48 B ECM ground[Engine is running]
IIdle speedEngine ground
(Probe this terminal with
(þ) tester probe when
measuring)
57 B ECM ground[Engine is running]
IIdle speedEngine ground
67 W/LPower supply for ECM
(Back-up)[Ignition switch ªOFFº]BATTERY VOLTAGE
(11 - 14V)
106
108B/Y
B/YECM ground[Engine is running]
IIdle speedEngine ground
11 0
11 2R
RPower supply for ECM[Ignition switch ªONº]BATTERY VOLTAGE
(11 - 14V)
DIAGNOSTIC PROCEDURENCEC0049
1 INSPECTION START
Start engine.
Is engine running?
YesorNo
Ye s©GO TO 4.
No©GO TO 2.
2 CHECK POWER SUPPLY-I
1. Turn ignition switch ªOFFº and then ªONº.
2. Check voltage between ECM terminal 43 and ground with CONSULT-II or tester.
SEF981WVoltage: Battery voltage
OK or NG
OK©GO TO 4.
NG©GO TO 3.
TROUBLE DIAGNOSIS FOR POWER SUPPLYSR20DE
Main Power Supply and Ground Circuit (Cont'd)
EC-116

3 DETECT MALFUNCTIONING PART
Check the following.
IFuse 10A, 40A
IHarness connectors M50, F104 (CVT: M81, F115)
IHarness for open or short between ECM and fuse block
IHarness for open or short between fuse block and ignition switch. Refer to wiring diagram.
©Repair harness or connectors.
4 CHECK POWER SUPPLY-II
1. Stop engine.
2. Check voltage between ECM terminals 67 and ground with CONSULT-II or tester.
SEF982WVoltage: Battery voltage
OK or NG
OK©GO TO 6.
NG©GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
IHarness connectors E90, F73
I10A fuse
IHarness for open or short between ECM and fuse
©Repair harness or connectors.
6 CHECK POWER SUPPLY-III
1. Turn ignition switch ªONº and then ªOFFº.
2. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.
SEF983WVoltage:
After turning ignition switch ªOFFº, battery voltage will exist for a few seconds, then drop to approximately 0V.
OK or NG
OK©GO TO 14.
NG (Battery voltage does not
exist.)©GO TO 7.
NG (Battery voltage exists for
more than a few seconds.)©GO TO 13.
TROUBLE DIAGNOSIS FOR POWER SUPPLYSR20DE
Main Power Supply and Ground Circuit (Cont'd)
EC-117

11 CHECK OUTPUT SIGNAL CIRCUIT
1. Check harness continuity between ECM terminal 31 and relay terminal 2.
Refer to wiring diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 13.
NG©GO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
IHarness connectors E42, F4
IHarness for open or short between ECM relay and ECM
©Repair open circuit or short to ground or short to power in harness or connectors.
13 CHECK ECM RELAY
1. Apply 12V direct current between relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.
SEC202BC12V (1 - 2) applied: Continuity exists.
No voltage applied: No continuity
OK or NG
OK©GO TO 14.
NG©Replace ECM relay.
14 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 48, 57, 106, 108 and engine ground.
Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 15.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
15 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-SR-114.
©INSPECTION END
TROUBLE DIAGNOSIS FOR POWER SUPPLYSR20DE
Main Power Supply and Ground Circuit (Cont'd)
EC-119

Component DescriptionNCEC0050The mass air flow sensor is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. It consists of a hot wire that is supplied with electric
current from the ECM. The temperature of the hot wire is controlled
by the ECM a certain amount. The heat generated by the hot wire
is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot wire as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0051Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE -B1IEngine: After warming up
IAir conditioner switch: ªOFFº
IShift lever: ªNº
INo-loadIdle 1.0 - 1.7V
2,500 rpm 1.5 - 2.4V
CAL/LD VALUEIEngine: After warming up
IAir conditioner switch: ªOFFº
IShift lever: ªNº
INo-loadIdle Not used
2,500 rpm Not used
MASS AIRFLOWIEngine: After warming up
IAir conditioner switch: ªOFFº
IShift lever: ªNº
INo-loadIdle 2.5 - 5.0 g×m/s
2,500 rpm 7.1 - 12.5 g×m/s
ECM Terminals and Reference ValueNCEC0052Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
61 B Mass air flow sensor[Engine is running]
IWarm-up condition
IIdle speed1.3 - 1.7V
[Engine is running]
IWarm-up condition
IEngine speed is 2,500 rpm1.8 - 2.4V
73 WMass air flow sensor
ground[Engine is running]
IWarm-up condition
IIdle speedApproximately 0V
On Board Diagnosis LogicNCEC0053
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0100*
0100A) An excessively high voltage from the sensor is sent to
ECM when engine is not running.IHarness or connectors
(The sensor circuit is open or shorted.)
IMass air flow sensor
B) An excessively low voltage from the sensor is sent to
ECM when engine is running.IHarness or connectors
(The sensor circuit is open or shorted.)
IIntake air leaks
IMass air flow sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
SEF987W
DTC P0100 MASS AIR FLOW SENSOR (MAFS)SR20DE
Component Description
EC-120

Diagnostic ProcedureNCEC0057
1 INSPECTION START
Which malfunction (A or B) is duplicated?
Malfunction A or B
A©GO TO 3.
B©GO TO 2.
2 CHECK INTAKE SYSTEM
Check the following for connection.
IAir cut
IVacuum hoses
IIntake air passage between air duct to collector
OK or NG
OK©GO TO 3.
NG©Reconnect the parts.
3 RETIGHTEN GROUND SCREWS
1. Turn ignition switch ªOFFº.
2. Loosen and retighten engine ground screws.
SEF202X
©GO TO 4.
Intake manifold
collector
Engine
ground
DTC P0100 MASS AIR FLOW SENSOR (MAFS)SR20DE
Diagnostic Procedure
EC-123

Component InspectionNCEC0058MASS AIR FLOW SENSORNCEC0058S011. Turn ignition switch ªONº.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 61 (Mass air flow sen-
sor signal) and ground.
Conditions Voltage V
Ignition switch ªONº (Engine stopped.)Less than 1.2
Idle (Engine is warmed-up to normal operating
temperature.)1.3 - 1.7
2,500 rpm (Engine is warmed-up to normal operat-
ing temperature.)1.8 - 2.4
Idle to about 4,000 rpm*1.3 - 1.7 to Approx. 4.0
*: Check for linear voltage rise in response to increases to about 4,000 rpm in
engine speed.
4. If the voltage is out of specification, disconnect mass air flow
sensor harness connector and connect it again. Repeat above
check.
5. If NG, remove mass air flow sensor from air duct. Check hot
film for damage or dust.
SEF993W
SEF987W
DTC P0100 MASS AIR FLOW SENSOR (MAFS)SR20DE
Component Inspection
EC-126

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

Diagnostic ProcedureNCEC0077
1 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect engine coolant temperature sensor harness connector.
SEF205X3. Turn ignition switch ªONº.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
SEF997WVoltage: Approximately 5V
OK or NG
OK©GO TO 3.
NG©GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM and engine coolant temperature sensor.
©Repair harness or connectors.
3 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between engine coolant temperature sensor harness connector terminal 1 and engine ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 5.
NG©GO TO 4.
Front exhaust tube
FrontCoolant temperature
sensor harness
connector
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)SR20DE
Diagnostic Procedure
EC-135