Infiniti M45 (Y34). Manual — part 483
DTC P2127, P2128 APP SENSOR
EC-621
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EC
DTC P2127, P2128 APP SENSOR
PFP:18002
Component Description
ABS002SU
Electric throttle control actuator consists of throttle control motor,
acceleration pedal position sensor, throttle position sensor, etc.
Accelerator pedal position sensor is connected to the accelerator
pedal through the throttle drum and accelerator wire, and detects the
accelerator pedal position by the throttle drum rotation angle.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal
position sensor. The ECM uses this signal for the engine operation such as fuel cut.
CONSULT-II Reference Value in Data Monitor Mode
ABS002SV
Specification data are reference values.
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differ from ECM terminal voltage signal.
On Board Diagnosis Logic
ABS002SW
NOTE:
If DTC P2127, P2128 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229.
Refer to
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.
PBIB1741E
MONITOR ITEM
CONDITION
SPECIFICATION
ACCEL SEN 1
ACCEL 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
CLSD THL POS
●
Ignition switch: ON
(engine stopped)
●
Selector lever: D
Accelerator pedal: Fully released
ON
Accelerator pedal: Slightly depressed
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1227
1227
Accelerator pedal position
sensor 2 circuit low input
An excessively low voltage from the APP
sensor 2 is sent to ECM.
●
Harness or connectors
(The APP sensor 2 circuit is open or
shorted.)
●
Accelerator pedal position sensor
(Accelerator pedal position sensor 2)
P1228
1228
Accelerator pedal position
sensor 2 circuit high input
An excessively high voltage from the APP
sensor 2 is sent to ECM.
Engine operating 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.
EC-622
DTC P2127, P2128 APP SENSOR
DTC Confirmation Procedure
ABS002SX
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 10V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 1 second.
4.
If DTC is detected, go to
EC-624, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
SEF058Y
DTC P2127, P2128 APP SENSOR
EC-623
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Wiring Diagram
ABS002SY
TBWA0285E
EC-624
DTC P2127, P2128 APP SENSOR
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.
Diagnostic Procedure
ABS002SZ
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
87
L/W
Accelerator pedal position
sensor 1
[Ignition switch: ON]
●
Engine stopped
●
Selector lever: D
●
Accelerator pedal: Fully released
More than 0.36V
[Ignition switch: ON]
●
Engine stopped
●
Selector lever: D
●
Accelerator pedal: Fully depressed
Less than 4.75V
89
B
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
94
G
Sensor power supply
(Accelerator pedal position
sensor 2)
[Ignition switch: ON]
Approximately 2.5V
100
BR
Sensor ground
(Accelerator pedal position
sensor 2)
[Ignition switch: ON]
Approximately 0V
103
L
Sensor power supply
[Ignition switch: ON]
Approximately 5V
117
B/R
Accelerator pedal position
sensor 2
[Ignition switch: ON]
●
Engine stopped
●
Selector lever: D
●
Accelerator pedal: Fully released
More than 0.18V
[Ignition switch: ON]
●
Engine stopped
●
Selector lever: D
●
Accelerator pedal: Fully depressed
Less than 2.37V
PBIB1118E
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