Infiniti FX35, FX50 (S51). Manual — part 727
P2127, P2128 APP SENSOR
EC-449
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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1.
Check the continuity between APP sensor harness connector and ECM harness connector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M6, E106
• Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
11.
CHECK APP SENSOR
EC-449, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 12.
12.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Go to
EC-450, "Special Repair Requirement"
.
>> INSPECTION END
13.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000005237059
1.
CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Turn ignition switch ON.
4.
Check the voltage ECM harness connector terminals under the following conditions.
Is the inspection result normal?
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E112
(Without ICC)
1
M107
98
Existed
E116
(With ICC)
6
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
M107
97 (APP sensor 1)
100
Accelerator pedal
Fully released
0.45 - 1.0
Fully depressed
4.4 - 4.8
98 (APP sensor 2)
104
Fully released
0.22 - 0.50
Fully depressed
2.1 - 2.5
EC-450
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P2127, P2128 APP SENSOR
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Go to
EC-455, "Special Repair Requirement"
.
>> INSPECTION END
Special Repair Requirement
INFOID:0000000005237060
1.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
Refer to
EC-25, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement"
.
>> GO TO 2.
2.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-25, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 3.
3.
PERFORM IDLE AIR VOLUME LEARNING
EC-25, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
.
>> END
P2138 APP SENSOR
EC-451
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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P2138 APP SENSOR
Description
INFOID:0000000005237061
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 potentiometer 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 sends 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 engine opera-
tions such as fuel cut.
DTC Logic
INFOID:0000000005237062
DTC DETECTION LOGIC
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.
>> GO TO 2.
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2138
Accelerator pedal posi-
tion (APP) sensor circuit
range/performance
Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor 1
and APP sensor 2.
• Harness or connectors
(APP sensor 2 circuit is open or shorted.)
[Crankshaft position (CKP) sensor circuit
is shorted.]
[Camshaft position (CMP) sensor (bank
2) circuit is shorted.]
[Exhaust valve timing (EVT) control posi-
tion sensor (bank 2) circuit is shorted.]
(Battery current sensor circuit is shorted.)
(EVAP control system pressure sensor
circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• APP sensor (APP sensor 2)
• CKP sensor
• CMP sensor (bank 2)
• EVT control position sensor (bank 2)
• Battery current sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
EC-452
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P2138 APP SENSOR
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237063
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ACCELERATOR PEDAL POSITION (APP) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect APP sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M6, E106
• Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch ON.
2.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 5.
5.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
APP sensor
Ground
Voltage (V)
Connector
Terminal
E112
(Without ICC)
5
Ground
Approx. 5
E116
(With ICC)
APP sensor
Ground
Voltage (V)
Connector
Terminal
E112
(Without ICC)
6
Ground
Approx. 5
E116
(With ICC)
3
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