Infiniti M45 (Y34). Manual — part 376
DTC P0117, P0118 ECT SENSOR
EC-193
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DTC P0117, P0118 ECT SENSOR
PFP:22630
Component Description
ABS002FO
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 ther-
mistor decreases as temperature increases.
<Reference data>
*: This data is reference values and is measured between ECM terminal 121 (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.
On Board Diagnosis Logic
ABS002FP
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEF594K
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
SEF012P
DTC No.
Trouble Diagnosis Name
DTC Detecting Condition
Possible Cause
P0117
0117
Engine coolant temperature
sensor circuit low input
An excessively low voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Engine coolant temperature sensor
P0118
0118
Engine coolant temperature
sensor circuit high input
An excessively high voltage from the sensor is
sent to ECM.
Detected items
Engine operating condition in fail-safe mode
Engine coolant temper-
ature 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)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while
engine is running.
EC-194
DTC P0117, P0118 ECT SENSOR
DTC Confirmation Procedure
ABS002FQ
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
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 5 seconds.
4.
If DTC is detected, go to
EC-196, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
SEF058Y
DTC P0117, P0118 ECT SENSOR
EC-195
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Wiring Diagram
ABS002FR
TBWA0273E
EC-196
DTC P0117, P0118 ECT SENSOR
Diagnostic Procedure
ABS002FS
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect engine coolant temperature (ECT) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between ECT sensor terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F261, F24
●
Harness for open and short between ECT sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1118E
Voltage: Approximately 5V
PBIB0014E
PBIB0080E
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