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DTC P0117, P0118 ECT SENSOR
EC-981
[YD (WITH EURO-OBD)]
C
D
E
F
G
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I
J
K
L
M
A
EC
DTC P0117, P0118 ECT SENSOR PFP:22630
Description EBS0118P
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>
*: These data are reference values and measured between ECM terminal 51 (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 EBS0118Q
DTC Confirmation Procedure EBS0118R
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 1st trip DTC is detected, go to EC-984, "
Diagnostic Procedure"
.
SEF594K
Engine coolant tempera-
ture °C (°F)
Voltage* (V) Resistance (kΩ)
−10 (14) 4.7 7.0 - 11.4
20 (68) 3.8 2.1 - 2.9
50 (122) 2.6 0.68 - 1.00
90 (194) 1.3 0.236 - 0.260
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0117
Engine coolant tempera-
ture 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
Engine coolant tempera-
ture sensor circuit high
input
An excessively high voltage from the sensor is
sent to ECM.
SEF817Y
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