Nissan Pathfinder (2012 year). Instruction — part 322
P0116 ECT SENSOR
EC-657
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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P0116 ECT SENSOR
Component Description
INFOID:0000000007358517
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:
Never 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.
DTC Logic
INFOID:0000000007358518
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Is it necessary to erase permanent DTC?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-658, "Component Function Check"
.
NOTE:
Use the component function check to check the overall function of the ECT sensor circut. During this check, a
1st trip DTC might not be confirmed.
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
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0116
ECT SEN/CIRC
[Engine coolant temperature
(ECT) sensor circuit range/per-
formance]
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
sensor, ECT sensor, and FTT sensor) shows
that the voltage signal of the ECT sensor is
higher/lower than that of other temperature
sensors when the engine is started with its
cold state.
• Harness or connectors
(High or low resistance in the ECT
sensor circuit)
• ECT sensor
August 2012
2012 Pathfinder
EC-658
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0116 ECT SENSOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
3.
PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
•
Before performing the following procedure, do not add fuel.
•
Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
•
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between
−
10
°
C (14
°
F) and 35
°
C (95
°
F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 20 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000007358519
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to
.
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-37, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Terminals
Condition
Resistance (k
Ω
)
1 and 2
Temperature [
°
C (
°
F)]
20 (68)
2.1 – 2.9
50 (122)
0.68 – 1.00
90 (194)
0.236 – 0.260
JMBIA0080ZZ
August 2012
2012 Pathfinder
P0116 ECT SENSOR
EC-659
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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Diagnosis Procedure
INFOID:0000000007358520
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Check ECT sensor. Refer to
EC-659, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace ECT sensor. Refer to
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-37, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000007358521
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor. Refer to
.
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ECT sensor. Refer to
.
Terminals
Condition
Resistance (k
Ω
)
1 and 2
Temperature [
°
C (
°
F)]
20 (68)
2.1 – 2.9
50 (122)
0.68 – 1.00
90 (194)
0.236 – 0.260
JMBIA0080ZZ
August 2012
2012 Pathfinder
EC-660
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0117, P0118 ECT SENSOR
P0117, P0118 ECT SENSOR
Component Description
INFOID:0000000007358522
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:
Never 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:0000000007358523
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 illuminates.
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 temperature
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)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates
while engine is running.
August 2012
2012 Pathfinder
P0117, P0118 ECT SENSOR
EC-661
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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DTC Confirmation Procedure
INFOID:0000000007358524
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:0000000007358525
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine coolant temperature (ECT) sensor harness connector.
2. Turn ignition switch ON.
BBIA0539E
1.
Engine coolant temperature (ETC)
sensor
2.
Intake manifold
: Vehicle front
BBIA0775E
August 2012
2012 Pathfinder
EC-662
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0117, P0118 ECT SENSOR
3. Check voltage between ECT sensor 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 following.
• Harness connector F38, F275
• 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 following.
• Harness connector F38, F275
• 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-662, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace engine coolant temperature sensor. Refer to
7.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000007358526
ENGINE COOLANT TEMPERATURE SENSOR
Voltage: Approximately 5 V
PBIB0080E
Continuity should exist.
August 2012
2012 Pathfinder
P0117, P0118 ECT SENSOR
EC-663
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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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. Refer to
.
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
August 2012
2012 Pathfinder
EC-664
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0122, P0123 TP SENSOR
P0122, P0123 TP SENSOR
Component Description
INFOID:0000000007358527
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometer which transform the throttle valve position
into output voltage, and emit the voltage signals to the ECM. The
ECM judges the current opening angle of the throttle valve from
these signals and controls the throttle valve in response to driving
conditions via the throttle control motor.
On Board Diagnosis Logic
INFOID:0000000007358528
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL illuminates.
DTC Confirmation Procedure
INFOID:0000000007358529
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000007358530
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
PBIB0145E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0122
0122
Throttle position sensor
2 circuit low input
An excessively low voltage from the TP sensor
2 is sent to ECM.
• Harness or connectors
(TP sensor 2 circuit is open or shorted.)
(APP sensor 2 circuit is shorted.)
• Electric throttle control actuator
(TP sensor 2)
• Accelerator pedal position sensor
(APP sensor 2)
P0123
0123
Throttle position sensor
2 circuit high input
An excessively high voltage from the TP sensor
2 is sent to ECM.
Engine operation condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10
degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.
August 2012
2012 Pathfinder
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