Infiniti FX35 / FX45. Manual - part 505

 

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Infiniti FX35 / FX45. Manual - part 505

 

 

DTC P0117, P0118 ECT SENSOR

EC-781

< SERVICE INFORMATION >

[VK45DE]

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Wiring Diagram

INFOID:0000000001326613

Diagnosis Procedure

INFOID:0000000001326614

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.

TBWM1328E

EC-782

< SERVICE INFORMATION >

[VK45DE]

DTC P0117, P0118 ECT SENSOR

Refer to 

EC-723, "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.

3.

Check voltage between ECT sensor terminal 1 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING RART

Check the following.
• Harness connector F261, F24
• 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.

PBIB2195E

: Vehicle front

1.

Engine coolant temperature sensor

2.

Engine coolant temperature sensor 
sub-harness connector

Voltage: Approximately 5V

PBIB3231E

PBIB0080E

Continuity should exist.

DTC P0117, P0118 ECT SENSOR

EC-783

< SERVICE INFORMATION >

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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 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.

6.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-783, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace engine coolant temperature sensor.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326615

ENGINE COOLANT TEMPERATURE SENSOR

1.

Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

<Reference data>

2.

If NG, replace engine coolant temperature sensor.

Removal and Installation

INFOID:0000000001326616

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EM-226

.

PBIB2005E

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-784

< SERVICE INFORMATION >

[VK45DE]

DTC P0122, P0123 TP SENSOR

DTC P0122, P0123 TP SENSOR

Component Description

INFOID:0000000001326617

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 potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326618

Specification data are reference values.

*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

INFOID:0000000001326619

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 lights up.

DTC Confirmation Procedure

INFOID:0000000001326620

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

3.

If DTC is detected, go to 

EC-786, "Diagnosis Procedure"

.

PBIB0145E

MONITOR ITEM

CONDITION

SPECIFICATION

TP SEN 1-B1
TP SEN 2-B1*

• Ignition switch: ON

(Engine stopped)

• Selector lever: D

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

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. 

 

 

 

 

 

 

 

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