1999 NISSAN PRIMERA Electronic Repair Manual

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Page 929 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Diagnostic ProcedureNCEC0070
1 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect mass air flow sensor harness connector.
SEF203X3. Turn ignition switch ªONº.
4. Check voltage between

Page 930 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 3 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between intake air temperature sensor (mass air flow sensor) harness connector terminal 3 and ECM termi-
nal 73.
Ref

Page 931 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Component InspectionNCEC0071INTAKE AIR TEMPERATURE SENSORNCEC0071S01Check resistance between mass air flow sensor terminal 1 and 3.
<Reference data>
Intake air temperature
ÉC (ÉF)Resistance kW
20 (6

Page 932 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 t

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

Page 933 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual DTC Confirmation ProcedureNCEC0075NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test

Page 934 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Wiring DiagramNCEC0076
YEC082A
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)SR20DE
Wiring Diagram
EC-134

Page 935 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 vo

Page 936 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Component InspectionNCEC0078ENGINE COOLANT TEMPERATURE SENSORNCEC0078S01Check resistance as shown in the figure.
<Reference data>
Temperature ÉC (ÉF) Resistance kW
20 (68)2.1 - 2.9
50 (122)0.68 - 1.

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