Infiniti I30 (A33). Manual — part 214
SEF594K
Component Description
NHEC0069
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 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.
SEF012P
<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)
2.2
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 body ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
On Board Diagnosis Logic
NHEC0070
Malfunction is detected when an excessively high or low voltage
from the sensor is sent to ECM.
FAIL-SAFE MODE
NHEC0070S02
When this malfunction is detected, the ECM enters fail-safe mode
and the MIL lights up.
Detected items
Engine operating condition in fail-safe mode
Engine coolant tem-
perature sensor circuit
Engine coolant temperature will be determined by ECM based on the time after turning ignition switch
“ON” or “START”.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided (CONSULT-II
display)
Just as ignition switch is turned ON or Start
40°C (104°F)
More than approx. 4 minutes after ignition ON or
Start
80°C (176°F)
Except as shown above
40 - 80°C (104 - 176°F)
(Depends on the time)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Component Description
EC-171
Possible Cause
NHEC0429
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Engine coolant temperature sensor
SEF058Y
DTC Confirmation Procedure
NHEC0071
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
WITH CONSULT-II
NHEC0071S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 5 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-174.
WITH GST
NHEC0071S02
Follow the procedure “WITH CONSULT-II” above.
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Possible Cause
EC-172
Wiring Diagram
NHEC0072
MEC802C
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Wiring Diagram
EC-173
Diagnostic Procedure
NHEC0073
1
CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperature sensor (ECTS) harness connector.
SEC005C
3. Turn ignition switch “ON”.
4. Check voltage between ECTS terminal 1 and ground with CONSULT-II or tester.
SEF585X
OK or NG
OK
©
GO TO 2.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
2
CHECK ECTS GROUND CIRCUIT FOR OPEN AND CIRCUIT
1. Turn ignition switch “OFF”.
2. Check harness continuity between ECTS terminal 2 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between ECM and engine coolant temperature sensor
I
Harness for open or short between TCM (Transmission Control Module) and engine coolant temperature sensor
©
Repair open circuit or short to power in harness or connectors.
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Diagnostic Procedure
EC-174
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