1999 NISSAN PRIMERA Electronic Repair Manual

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Page 545 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Main Power Supply and Ground Circuit
WIRING DIAGRAMNCEC0047
YEC770
BATTERY
Refer to EL-POWER.
OFF
ACCST
ONIGNITION
SWITCH
FUSE
BLOCK
(J/B)
To EC-IGN/SG,
EC-TP/SW,
EC-AAC/V,
EC-EGR,
EC-EGVC/V ECM RELAY

Page 546 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual ECM TERMINALS AND REFERENCE VALUENCEC0048Specification data are reference values and are measured between each terminal and ECM.
CAUTION:
Do not use ECM ground terminals when measuring input/output vo

Page 547 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 T

Page 548 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 5 CHECK POWER SUPPLY-II
1. Disconnect ECM relay.
SEF984W
2. Check voltage between ECM relay terminals 1, 6 and ground with CONSULT-II or tester.
SEF101Y
OK or NG
OK©GO TO 7.
NG©GO TO 6.
6 DETECT MAL

Page 549 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 M

Page 550 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 12 CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM
1. Disconnect ECM harness connector.
2. Disconnect ECM relay.
SEF984W3. Check harness continuity between ECM terminals 110, 112 and relay terminal

Page 551 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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

Page 552 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 t

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

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