Nissan Altima L32. Instruction — part 329
P2135 TP SENSOR
EC-437
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EC-438
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P2138 APP SENSOR
P2138 APP SENSOR
Description
INFOID:0000000004349498
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.
DTC Logic
INFOID:0000000004349499
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 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.
>> GO TO 2.
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
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2138
Accelerator pedal posi-
tion 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 connector
(APP sensor 1 and 2 circuit is open or
shorted.)
[Crankshaft position sensor (POS) circuit
is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
(EVAP control system sensor circuit is
shorted.)
(Tumble control valve position sensor cir-
cuit is shorted.)
• Accelerator pedal position sensor
(APP sensor 1 and 2)
• Crankshaft position sensor (POS)
• Refrigerant pressure sensor
• EVAP control system pressure sensor
• Tumble control valve position sensor
P2138 APP SENSOR
EC-439
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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EC
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Diagnosis Procedure
INFOID:0000000004349500
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (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 3.
NO
>> Repair open circuit or short to ground or shot to power in
harness or connectors.
3.
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 7.
NO
>> GO TO 4.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or shot to power in harness or connectors.
5.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
APP sensor
Ground
Voltage
Connector Terminal
E40
5
Ground Approx. 5 V
PBIA9607J
APP sensor
Ground
Voltage
Connector Terminal
E40
6
Ground Approx. 5 V
JMBIA1609ZZ
APP sensor
ECM
Continuity
Connector Terminal Connector Terminal
E40
6
E10
87
Existed
EC-440
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P2138 APP SENSOR
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair short to ground or short to power in harness or connectors.
6.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-281, "Component Inspection"
• EVAP control system pressure sensor (Refer to
EC-318, "Component Inspection"
.)
• Refrigerant pressure sensor (Refer to
.)
• Tumble control valve position sensor (Refer to
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace malfunctioning component.
7.
CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sensor harness connector and ECM harness connector as follows.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair open circuit or short to ground or shot to power in harness or connectors.
8.
CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sensor harness connector and ECM harness connector as follows.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair open circuit or short to ground or shot to power in harness or connectors.
9.
CHECK APP SENSOR
EC-432, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 11.
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F13
72
Tumble control valve position sensor
F43
1
Refrigerant pressure sensor
E219
3
76
CKP sensor (POS)
F30
1
E10
87
APP sensor
E40
6
91
EVAP control system pressure sensor
B41
3
APP sensor
ECM
Continuity
Connector Terminal Connector Terminal
E40
2
F10
84
Existed
4
100
APP sensor
ECM
Continuity
Connector Terminal Connector Terminal
E40
1
F10
82
Existed
3
81
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