Nissan Pathfinder (2008 year). Manual — part 340
P2127, P2128 APP SENSOR
EC-837
< COMPONENT DIAGNOSIS >
[VK56DE]
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P2127, P2128 APP SENSOR
Component Description
INFOID:0000000001537969
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:0000000001537970
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.
DTC Confirmation Procedure
INFOID:0000000001537971
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 8V at idle.
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
3.
If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000001537972
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2127
2127
Accelerator pedal position
sensor 2 circuit low input
An excessively low voltage from the APP
sensor 2 is sent to ECM.
• Harness or connectors
(APP sensor 2 circuit is open or shorted.)
(TP sensor circuit is shorted.)
• Accelerator pedal position sensor
(Accelerator pedal position sensor 2)
• Electric throttle control actuator
(TP sensor)
P2128
2128
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-838
< COMPONENT DIAGNOSIS >
[VK56DE]
P2127, P2128 APP SENSOR
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1.
Disconnect accelerator pedal position (APP) sensor (1) harness
connector.
2.
Turn ignition switch ON.
3.
Check voltage between APP sensor terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 3.
3.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
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 4.
NG
>> Repair open circuit.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals
BBIA0539E
AWBIA0079ZZ
Voltage: Approximately 5V
PBIB2611E
Continuity should exist.
ECM terminal
Sensor terminal
Reference Wiring Diagram
47
Electric throttle control actuator terminal 2
EC-897, "Wiring Diagram - ENGINE CONTROL SYSTEM
91
APP sensor terminal 1
P2127, P2128 APP SENSOR
EC-839
< COMPONENT DIAGNOSIS >
[VK56DE]
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OK or NG
OK
>> GO TO 5.
NG
>> Repair short to ground or short to power in harness or connectors.
5.
CHECK THROTTLE POSITION SENSOR
EC-844, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 6.
6.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace the electric throttle control actuator.
2.
EC-497, "Throttle Valve Closed Position Learning"
3.
EC-497, "Idle Air Volume Learning"
.
>> INSPECTION END
7.
CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 83 and APP sensor terminal 5.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between 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 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK APP SENSOR
EC-840, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace the accelerator pedal assembly.
2.
EC-497, "Accelerator Pedal Released Position Learning"
.
3.
EC-497, "Throttle Valve Closed Position Learning"
4.
EC-497, "Idle Air Volume Learning"
.
>> INSPECTION END
11.
CHECK INTERMITTENT INCIDENT
GI-51, "Intermittent Incident"
.
Continuity should exist.
Continuity should exist.
EC-840
< COMPONENT DIAGNOSIS >
[VK56DE]
P2127, P2128 APP SENSOR
>> INSPECTION END
Component Inspection
INFOID:0000000001537973
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 next step.
5.
EC-497, "Accelerator Pedal Released Position Learning"
6.
EC-497, "Throttle Valve Closed Position Learning"
7.
EC-497, "Idle Air Volume Learning"
.
Terminal
Accelerator pedal
Voltage
106
(Accelerator pedal position
sensor 1)
Fully released
0.65 - 0.87V
Fully depressed
More than 4.3V
98
(Accelerator pedal position
sensor 2)
Fully released
0.28 - 0.48V
Fully depressed
More than 2.0V
MBIB0023E
P2135 TP SENSOR
EC-841
< COMPONENT DIAGNOSIS >
[VK56DE]
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P2135 TP SENSOR
Component Description
INFOID:0000000001537974
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.
On Board Diagnosis Logic
INFOID:0000000001537975
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
INFOID:0000000001537976
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 8V at idle.
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
3.
If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000001537977
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
PBIB0145E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2135
2135
Throttle position sensor
circuit range/performance
Rationally incorrect voltage is sent to ECM
compared with the signals from TP sensor 1
and TP sensor 2.
• Harness or connector
(TP sensor 1 and 2 circuit is open or
shorted.)
(APP sensor 2 circuit is shorted.)
• Electric throttle control actuator
(TP sensor 1 and 2)
• Accelerator pedal position sensor
(APP sensor 2)
Engine operation 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-842
< COMPONENT DIAGNOSIS >
[VK56DE]
P2135 TP SENSOR
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-I
1.
Disconnect electric throttle control actuator harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between electric throttle control actuator terminal
2 and ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 3.
3.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between electric throttle control actuator terminal 2 and ECM terminal 47.
Refer to Wiring Diagram.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit.
4.
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
BBIA0539E
BBIA0371E
Voltage: Approximately 5V
PBIB2065E
Continuity should exist.
ECM terminal
Sensor terminal
Reference Wiring Diagram
47
Electric throttle control actuator terminal 2
EC-897, "Wiring Diagram - ENGINE CONTROL SYSTEM
91
APP sensor terminal 1
P2135 TP SENSOR
EC-843
< COMPONENT DIAGNOSIS >
[VK56DE]
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OK or NG
OK
>> GO TO 5.
NG
>> Repair short to ground or short to power in harness or connectors.
5.
CHECK ACCELERATOR PEDAL POSITION SENSOR
EC-848, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 6.
6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace the accelerator pedal assembly.
2.
EC-497, "Accelerator Pedal Released Position Learning"
.
3.
EC-497, "Throttle Valve Closed Position Learning"
4.
EC-497, "Idle Air Volume Learning"
.
>> INSPECTION END
7.
CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 66.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 50 and electric throttle control actuator terminal 1, ECM
terminal 69 and electric throttle control actuator terminal 3.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK THROTTLE POSITION SENSOR
EC-844, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace the electric throttle control actuator.
2.
EC-497, "Throttle Valve Closed Position Learning"
3.
EC-497, "Idle Air Volume Learning"
.
>> INSPECTION END
11.
CHECK INTERMITTENT INCIDENT
GI-51, "Intermittent Incident"
.
Continuity should exist.
Continuity should exist.
EC-844
< COMPONENT DIAGNOSIS >
[VK56DE]
P2135 TP SENSOR
>> INSPECTION END
Component Inspection
INFOID:0000000001537978
THROTTLE POSITION SENSOR
1.
Reconnect all harness connectors disconnected.
2.
EC-497, "Throttle Valve Closed Position Learning"
3.
Turn ignition switch ON.
4.
Set selector lever to D position.
5.
Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under the following condi-
tions.
6.
If NG, replace electric throttle control actuator and go to the next
step.
7.
EC-497, "Throttle Valve Closed Position Learning"
8.
EC-497, "Idle Air Volume Learning"
.
Terminal
Accelerator pedal
Voltage
50
(Throttle position sensor 1)
Fully released
More than 0.36V
Fully depressed
Less than 4.75V
69
(Throttle position sensor 2)
Fully released
Less than 4.75V
Fully depressed
More than 0.36V
PBIB1530E
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