Nissan Frontier. Manual - part 637

P0117, P0118 ECT SENSOR

EC-1119

< DTC/CIRCUIT DIAGNOSIS >

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DTC Confirmation Procedure

INFOID:0000000009481768

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 and wait at least 5 seconds.
3. Check DTC.
4. If DTC is detected, go to 

EC-1119, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481769

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-1094, "Ground Inspection"

.

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.

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)

When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while 
engine is running.

BBIA0539E

BBIA0542E

EC-1120

< DTC/CIRCUIT DIAGNOSIS >

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P0117, P0118 ECT SENSOR

3. Check voltage between ECT sensor terminal 1 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

3.

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 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-1120, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace engine coolant temperature sensor. Refer to 

CO-57, "Exploded View"

.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481770

ENGINE COOLANT TEMPERATURE SENSOR

1. Check resistance between engine coolant temperature sensor

terminals 1 and 2 as shown in the figure.

Voltage: Approximately 5V

PBIB0080E

Continuity should exist.

PBIB2005E

P0117, P0118 ECT SENSOR

EC-1121

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<Reference data>

2. If NG, replace engine coolant temperature sensor.

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

EC-1122

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P0122, P0123 TP SENSOR

P0122, P0123 TP SENSOR

Component Description

INFOID:0000000009481771

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 signal to the ECM.The ECM

judges the current opening angle of the throttle valve from these sig-

nals and controls the throttle valve opening angle in response to

driving conditions via the throttle control motor.

On Board Diagnosis Logic

INFOID:0000000009481772

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:0000000009481773

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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 10V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to 

EC-1122, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481774

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

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

(The TP sensor 2 circuit is open or short-
ed.)
(The 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.