Nissan Frontier D40. Instruction — part 417
P2138 APP SENSOR
EC-359
< COMPONENT DIAGNOSIS >
[QR25DE]
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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.
EC-360
< COMPONENT DIAGNOSIS >
[QR25DE]
P2138 APP SENSOR
Diagnosis Procedure
INFOID:0000000005273402
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect accelerator pedal position (APP) sensor harness
connector.
2.
Turn ignition switch ON.
3.
Check voltage between APP sensor terminal 2 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit, short to ground or short to power in
harness or connectors.
3.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Check voltage between APP sensor terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 4.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
BBIA0614E
BBIA0592E
Voltage: Approximately 5V
PBIB2608E
Voltage: Approximately 5V
PBIB2611E
P2138 APP SENSOR
EC-361
< COMPONENT DIAGNOSIS >
[QR25DE]
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1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit.
5.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK THROTTLE POSITION SENSOR
EC-358, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 7.
7.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace the electric throttle control actuator.
2.
EC-24, "Throttle Valve Closed Position Learning"
.
3.
EC-24, "Idle Air Volume Learning"
>> INSPECTION END
8.
CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between APP sensor terminal 4 and ECM terminal 82, APP sensor terminal 5
and ECM terminal 83.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 106 and APP sensor terminal 3, ECM terminal 98 and
APP sensor terminal 6.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 10.
Continuity should exist.
ECM terminal
Sensor terminal
91
APP sensor terminal 1
47
Electric throttle control actuator terminal 2
Continuity should exist.
Continuity should exist.
EC-362
< COMPONENT DIAGNOSIS >
[QR25DE]
P2138 APP SENSOR
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK APP SENSOR
EC-362, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 11.
11.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
EC-24, "Accelerator Pedal Released Position Learning"
3.
EC-24, "Throttle Valve Closed Position Learning"
.
4.
EC-24, "Idle Air Volume Learning"
>> INSPECTION END
12.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005273403
ACCELERATOR PEDAL POSITION SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.
4.
If NG, replace accelerator pedal assembly and go to the next step.
5.
EC-24, "Accelerator Pedal Released Position Learning"
6.
EC-24, "Throttle Valve Closed Position Learning"
.
7.
EC-24, "Idle Air Volume Learning"
Terminal
Accelerator pedal
Voltage
106
(Accelerator pedal position
sensor 1)
Fully released
0.6 - 0.95V
Fully depressed
Less than 4.75V
98
(Accelerator pedal position
sensor 2)
Fully released
0.3 - 0.45V
Fully depressed
Less than 2.4V
MBIB0023E
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