Nissan Titan. Instruction — part 222
P0117, P0118 ECT SENSOR
EC-189
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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P0117, P0118 ECT SENSOR
Component Description
INFOID:0000000009886590
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 value and is measured between ECM terminal 73 (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
INFOID:0000000009886591
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 following condition.
CONSULT displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT display)
Just as ignition switch is turned ON or START
40
°C (104°F)
Approx. 4 minutes or more after engine starting
80
°C (176°F)
Except as shown above
40 - 80
°C (104 - 176°F)
(Depends on the time)
EC-190
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0117, P0118 ECT SENSOR
DTC Confirmation Procedure
INFOID:0000000009886592
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Wait at least 5 seconds.
4. Check DTC.
5. If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000009886593
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
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 (1) harness connector.
2. Turn ignition switch ON.
BBIA0354E
1.
Engine coolant temperature (ETC)
sensor
2.
Intake manifold
BBIA0775E
P0117, P0118 ECT SENSOR
EC-191
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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3. Check voltage between ECT sensor (1) terminal 1 and ground
with CONSULT or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING RART
Check the harness for open or short between ECM and engine coolant temperature sensor.
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the 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.
6.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-191, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace engine coolant temperature sensor.
7.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009886594
ENGINE COOLANT TEMPERATURE SENSOR
Voltage: Approximately 5V
PBIB0080E
Continuity should exist.
EC-192
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0117, P0118 ECT SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
2. If NG, replace engine coolant temperature sensor.
PBIB2005E
Engine coolant temperature
°C (°F)]
Resistance (k
Ω)
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
SEF012P
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