Nissan Primera P11. Instruction — part 142
Component Description
NCEC0079
The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiom-
eter which transforms the throttle position into output voltage, and emits the voltage signal to the ECM. In
addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal
to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sen-
sor. This sensor controls engine operation such as fuel cut. On the other hand, the “Wide open and closed
throttle position switch”, which is built into the throttle position sensor unit, is not used for engine control.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0080
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
THRTL POS SEN
I
Engine: Idle
Throttle valve fully closed
0.35 - 0.65V
I
Ignition switch: ON
(Engine stopped)
Throttle valve fully opened
3.7 - 4.5V
ABSOL TH
⋅
P/S
I
Engine: Idle
Throttle valve fully closed
0.0°
I
Ignition switch: ON
(Engine stopped)
Throttle valve fully opened
Approx. 80°
NEF245A
Throttle
position
sensor
Output
voltage
between
terminal
No.
2
and
3
(V)
Throttle valve opening angle (deg)
Output voltage between
terminal No. 2 and 3)
Supply voltage: 5V
(Applied between terminal
No. 1 and 3)
DTC P0120 THROTTLE POSITION SENSOR
QG16
I
18DE
Component Description
EC-125
ECM Terminals and Reference Value
=NCEC0081
Specification data are reference values and are measured between each terminal 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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
58
B
Sensors’ ground
[Engine is running]
I
Warm up condition
I
Idle speed
Approximately 0V
92
Y
Throttle position sensor
[Engine is running]
I
Accelerator pedal fully released
0.35 - 0.65V
[Ignition switch “ON”]
I
Accelerator pedal fully depressed
3.7 - 4.5V
111
G
Sensors’ power supply
[Ignition switch “ON”]
Approximately 5V
On Board Diagnosis Logic
NCEC0082
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0120*
0120
An excessively low or high voltage from the sensor is
sent to ECM while driving.
I
Harness or connectors
(The throttle position sensor circuit is open or
shorted.)
I
Throttle position sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
Detected items
Engine operating condition in fail-safe mode
Throttle position sensor
circuit
Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.
Condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
DTC Confirmation Procedure
NCEC0083
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 9 seconds
before conducting the next test.
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
I
Before performing the following procedure, confirm that
battery voltage is more than 10V at idle.
I
This test may be conducted with the drive wheels lifted in
the shop or by driving the vehicle. If a road test is
expected to be easier, it is unnecessary to lift the vehicle.
DTC P0120 THROTTLE POSITION SENSOR
QG16
I
18DE
ECM Terminals and Reference Value
EC-126
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2)
Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE
More than 4 km/h (2 MPH)
Selector lever
Suitable position except “N” position
3)
If 1st trip DTC is detected, go to “Diagnostic Procedure”, EC-
QG-129.
With GST
Follow the procedure “With CONSULT-II” above.
PEF651U
DTC P0120 THROTTLE POSITION SENSOR
QG16
I
18DE
DTC Confirmation Procedure (Cont’d)
EC-127
Wiring Diagram
NCEC0084
YEC064A
DTC P0120 THROTTLE POSITION SENSOR
QG16
I
18DE
Wiring Diagram
EC-128
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