Nissan Terrano r20e. Manual — part 181
Component Description
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
The 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 cool-
ant temperature input. The sensor comprises a thermistor which is
sensitive to the change in temperature. The electrical resistance of
the thermistor decreases as temperature increases.
<Reference data>
Engine coolant
temperature
°C (°F)
Voltage
(V)
Resistance
(k
Ω
)
−10 (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
On Board Diagnosis Logic
DTC
Malfunction is detected when ...
Check Items
(Possible Cause)
P0115
0103
I
An excessively high or low voltage from the sensor is
input to ECM.
I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I
Engine coolant temperature sensor
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to “ON” position.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 5 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to “ON” position and wait at least 5 sec-
onds.
2) Turn ignition switch to “LOCK” position, wait at least 5 seconds
and then turn to “ON” position.
3) Perform diagnostic test mode II (Self-diagnostic results).
SEF594K
SEF012P
DTC P0115 COOLANT TEMP SEN
TD27Ti
EC-361
Wiring Diagram
YEC144A
DTC P0115 COOLANT TEMP SEN
TD27Ti
EC-362
Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect engine coolant temperature
sensor harness connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between engine coolant
temperature sensor connector terminal
q
1
and engine ground with CONSULT-II
or tester.
Voltage:
Approximately 4.9V
OK
E
NG
Check the following:
I
Harness connectors
E151
,
F138
(LHD model)
E151
,
M843
(RHD
model)
I
Harness for open or
short circuit between
ECM and engine coolant
temperature sensor.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Check harness continuity between
engine coolant temperature sensor
connector terminal
q
2
and ECM terminal
334
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness connectors
E151
,
F138
(LHD model)
E151
,
M843
(RHD
model)
I
Harness for open or
short circuit between
ECM and engine coolant
temperature sensor.
If NG, repair harness or
connectors.
CHECK COMPONENT
(Engine coolant temperature sensor).
Refer to EC-364.
OK
E
NG
Replace engine coolant
temperature sensor.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
NEF487
NEF670
H
H
H
H
H
H
DTC P0115 COOLANT TEMP SEN
TD27Ti
EC-363
Component Inspection
ENGINE COOLANT TEMPERATURE SENSOR
Check resistance as shown in the figure.
Temperature °C (°F)
Resistance k
Ω
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
DTC P0115 COOLANT TEMP SEN
TD27Ti
EC-364
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