check engine NISSAN PRIMERA 1999 Electronic Repair Manual

CONSULT-II Reference Value in Data Monitor
Mode
NCEC0042Remarks:
ISpecification data are reference values.
ISpecification data are output/input values which are detected or supplied by the ECM at the connector.
* Specification data may not be directly related to their components signals/values/operations.
(i.e., Adjust ignition timing with a timing light before monitoring IGN TIMING. Specification data might be displayed even when igni-
tion timing is not adjusted to specification. This IGN TIMING monitors the data calculated by the ECM according to the input signals
from the camshaft position sensor and other ignition timing related sensors.)
IIf the real-time diagnosis results are NG, and the on board diagnostic system results are OK, when diagnosing the mass air flow sensor,
first check to see if the fuel pump control circuit is normal.
MONITOR ITEM CONDITION SPECIFICATION
ENG SPEEDITachometer: Connect
IRun engine and compare tachometer indication with the CONSULT-II
value.Almost the same speed as the
CONSULT-II value.
MAS A/F SE-B1IEngine: After warming up
IAir conditioner switch: OFF
IShift lever: ªNº
INo-loadIdle 1.0 - 1.7V
2,500 rpm 1.5 - 2.1V
COOLAN TEMP/SIEngine: After warming up More than 70ÉC (158ÉF)
HO2S1 (B1)
IEngine: After warming upMaintaining engine speed at 2,000
rpm0 - 0.3V+,0.6 - 1.0V
HO2S1 MNTR (B1)LEAN+,RICH
Changes more than 5 times
during 10 seconds.
HO2S2 (B1)
IEngine: After warming upRevving engine from idle to 3,000
rpm quickly0 - 0.3V+,0.6 - 1.0V
HO2S2 MNTR (B1)LEAN+,RICH
VHCL SPEED SEITurn drive wheels and compare speedometer indication with the CON-
SULT-II valueAlmost the same speed as the
CONSULT-II value
BATTERY VOLTIIgnition switch: ON (Engine stopped) 11 - 14V
THRTL POS SENIEngine: Idle Throttle valve fully closed 0.35 - 0.65V
IIgnition switch: ON
(Engine stopped)Throttle valve fully opened 3.7 - 4.5V
EGR TEMP SEN*IEngine: After warming up Less than 4.5V
START SIGNALIIgnition switch: ON,START,ON OFF,ON,OFF
CLSD THL/P SW
CLSD THL POSIEngine: Idle Throttle valve: Idle position ON
IIgnition switch: ON
(Engine stopped)Throttle valve: Slightly open OFF
AIR COND SIGIEngine: After warming up, idle
the engineA/C switch ªOFFº OFF
A/C switch ªONº
(Compressor operates)ON
P/N POSI SWIIgnition switch: ONShift lever ªNº ON
Except above OFF
PW/ST SIGNALIEngine: After warming up, idle
the engineSteering wheel in neutral position
(forward direction)OFF
The steering wheel is turned ON
IGNITION SWIIgnition switch: ON,OFF ON,OFF
*: If so equipped
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTIONQG16I18DE
CONSULT-II Reference Value in Data Monitor Mode
EC-86

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 9.
NG©GO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following.
I10A Fuse
I40A fusible link
IHarness connectors M50, F104
IHarness for open or short between ECM and fuse block
IHarness for open or short between fuse block and ignition switch
©Repair harness or connectors.
4 CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
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 power.
OK or NG
OK©GO TO 5.
NG©Repair open circuit or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR POWER SUPPLYQG16I18DE
Main Power Supply and Ground Circuit (Cont'd)
EC-105

9 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 11.
NG©GO TO 10.
10 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.
11 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 17.
NG (Battery voltage does not
exist.)©GO TO 12.
NG (Battery voltage exists for
more than a few seconds.)©GO TO 16.
TROUBLE DIAGNOSIS FOR POWER SUPPLYQG16I18DE
Main Power Supply and Ground Circuit (Cont'd)
EC-107

16 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 17.
NG©Replace ECM relay.
17 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 18.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
18 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-QG-102.
©INSPECTION END
TROUBLE DIAGNOSIS FOR POWER SUPPLYQG16I18DE
Main Power Supply and Ground Circuit (Cont'd)
EC-109

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 - 2.1V
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 1.0 - 4.0 g×m/s
2,500 rpm 5.0 - 10.0 g×m/s
ECM Terminals and Reference ValueNCEC0052Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
61 B Mass air flow sensor[Engine is running]
IWarm-up condition
IIdle speed1.0 - 1.7V
[Engine is running]
IWarm-up condition
IEngine speed is 2,500 rpm1.5 - 2.1V
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)QG16I18DE
Component Description
EC-110

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 duct
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.
SEF994W
©GO TO 4.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)QG16I18DE
Diagnostic Procedure
EC-113

7 CHECK INPUT SIGNAL CIRCUIT
1. Check harness continuity between mass air flow sensor harness connector terminal 5 and ECM terminal 61.
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 8.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
8 CHECK MASS AIR FLOW SENSOR
Refer to ªComponent Inspectionº, EC-QG-115.
OK or NG
OK©GO TO 9.
NG©Replace mass air flow sensor.
9 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-QG-102.
©INSPECTION END
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.)1.0 - 1.7
2,500 rpm (Engine is warmed-up to normal operat-
ing temperature.)1.7 - 2.1
Idle to about 4,000 rpm* 1.0 - 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)QG16I18DE
Diagnostic Procedure (Cont'd)
EC-115

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 ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the 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)QG16I18DE
Component Description
EC-120

Diagnostic ProcedureNCEC0077
1 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect engine coolant temperature sensor harness connector.
SEF999W3. 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.
4 DETECT MALFUNCTIONING PART
Check the following.
IHarness for open or short between ECM and engine coolant temperature sensor
©Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)QG16I18DE
Diagnostic Procedure
EC-123

5 CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to ªComponent Inspectionº, EC-QG-124.
OK or NG
OK©GO TO 6.
NG©Replace engine coolant temperature sensor.
6 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-QG-102.
©INSPECTION END
Component InspectionNCEC0078ENGINE COOLANT TEMPERATURE SENSORNCEC0078S01Check resistance as shown in the figure.

Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
If NG, replace engine coolant temperature sensor.
SEF152P
SEF012P
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)QG16I18DE
Diagnostic Procedure (Cont'd)
EC-124