Infiniti M35/M45 Y50. Manual — part 614
DTC P0117, P0118 ECT SENSOR
EC-929
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
NBS005CX
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screws on the body.
Refer to
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-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
1.
Body ground M70
2.
Body ground M16
PBIB2782E
: Vehicle front
1.
Engine coolant temperature sensor
sub-harness connector
2.
Engine coolant temperature sensor
Voltage: Approximately 5V
PBIB2684E
PBIB0080E
EC-930
[VK45DE]
DTC P0117, P0118 ECT SENSOR
3.
DETECT MALFUNCTIONING RART
Check the following.
●
Harness connector F291, F50
●
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 F291, F50
●
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-931, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace engine coolant temperature sensor.
7.
CHECK INTERMITTENT INCIDENT
Refer to
EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Continuity should exist.
DTC P0117, P0118 ECT SENSOR
EC-931
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Component Inspection
NBS005CY
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
NBS005CZ
ENGINE COOLANT TEMPERATURE SENSOR
Refer to
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-932
[VK45DE]
DTC P0122, P0123 TP SENSOR
DTC P0122, P0123 TP SENSOR
PFP:16119
Component Description
NBS005D0
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-II Reference Value in Data Monitor Mode
NBS005D1
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
NBS005D2
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.
PBIB0145E
MONITOR ITEM
CONDITION
SPECIFICATION
THRTL SEN 1
THRTL SEN 2*
●
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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