Nissan Frontier D40. Manual - part 417
P2138 APP SENSOR
EC-359
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P2138 APP SENSOR
Component Description
INFOID:0000000005273399
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
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 oper-
ation such as fuel cut.
On Board Diagnosis Logic
INFOID:0000000005273400
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to
.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
INFOID:0000000005273401
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.
WITH CONSULT-III
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
3.
If DTC is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT-III” above.
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2138
2138
Accelerator pedal position
sensor circuit range/perfor-
mance problem
Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor
1 and APP sensor 2.
• Harness or connector
(The APP sensor 1 and 2 circuit is open
or shorted.)
(TP sensor circuit is shorted.)
• Accelerator pedal position sensor
(APP sensor 1 and 2)
• Electric throttle control actuator
(TP sensor 1 and 2)
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.