Nissan Pathfinder (2009 year). Manual - part 353

EC-568, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

Disconnect accelerator pedal position (APP) sensor (1) harness
connector.

Turn ignition switch ON.

Check voltage between APP sensor terminal 2 and ground with
CONSULT-III or tester.

OK or NG

>> GO TO 3.

>> Repair open circuit or short to ground or short to power

in harness or connectors.

CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 82 and APP sensor terminal 4.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 4.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 106 and APP sensor terminal 3.
Refer to Wiring Diagram.

BBIA0539E

AWBIA0079ZZ

Voltage: Approximately 5 V

PBIB2608E

Continuity should exist.

2009 Pathfinder

P2122, P2123 APP SENSOR

EC-839

< COMPONENT DIAGNOSIS >

[VK56DE]

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 5.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR

EC-839, "Component Inspection"

OK or NG

>> GO TO 7.

>> GO TO 6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace the accelerator pedal assembly.

EC-500, "Accelerator Pedal Released Position Learning"

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

GI-49, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000003936821

ACCELERATOR PEDAL POSITION SENSOR

Reconnect all harness connectors disconnected.

Turn ignition switch ON.

Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.

If NG, replace accelerator pedal assembly and go to next step.

EC-500, "Accelerator Pedal Released Position Learning"

EC-840, "Diagnosis Procedure"

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

2009 Pathfinder

EC-840

< COMPONENT DIAGNOSIS >

[VK56DE]

P2127, P2128 APP SENSOR

P2127, P2128 APP SENSOR

Component Description

INFOID:0000000004333391

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.
The ECM judges the current opening angle of the accelerator pedal
from these signals and controls the throttle valve in response to driv-
ing conditions via the throttle control motor.
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 operation such as fuel cut.

On Board Diagnosis Logic

INFOID:0000000003936823

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 illuminates.

DTC Confirmation Procedure

INFOID:0000000003936824

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

Start engine and let it idle for 1 second.

Check DTC.

If DTC is detected, go to

Diagnosis Procedure

INFOID:0000000003936825

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten 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.

2009 Pathfinder

P2127, P2128 APP SENSOR

EC-841

< COMPONENT DIAGNOSIS >

[VK56DE]

EC-568, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

Disconnect accelerator pedal position (APP) sensor (1) harness
connector.

Turn ignition switch ON.

Check voltage between APP sensor terminal 1 and ground with
CONSULT-III or tester.

OK or NG

>> GO TO 7.

>> GO TO 3.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between APP sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.

OK or NG

>> GO TO 4.

>> Repair open circuit.

CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals

BBIA0539E

AWBIA0079ZZ

Voltage: Approximately 5 V

PBIB2611E

Continuity should exist.

ECM terminal

Sensor terminal

Reference Wiring Diagram

Electric throttle control actuator terminal 2

EC-899, "Wiring Diagram - ENGINE CONTROL SYSTEM

APP sensor terminal 1

2009 Pathfinder

EC-842

< COMPONENT DIAGNOSIS >

[VK56DE]

P2127, P2128 APP SENSOR

OK or NG

>> GO TO 5.

>> Repair short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR

EC-847, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 6.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace the electric throttle control actuator.

>> INSPECTION END

CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 83 and APP sensor terminal 5.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 8.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 98 and APP sensor terminal 6.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 9.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR

EC-843, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 10.

10.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace the accelerator pedal assembly.

EC-500, "Accelerator Pedal Released Position Learning"

>> INSPECTION END

11.

CHECK INTERMITTENT INCIDENT

GI-49, "Intermittent Incident"

Continuity should exist.

2009 Pathfinder

P2127, P2128 APP SENSOR

EC-843

< COMPONENT DIAGNOSIS >

[VK56DE]

>> INSPECTION END

Component Inspection

INFOID:0000000004333393

ACCELERATOR PEDAL POSITION SENSOR

Reconnect all harness connectors disconnected.

Turn ignition switch ON.

Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.

If NG, replace accelerator pedal assembly and go to next step.

EC-500, "Accelerator Pedal Released Position Learning"

EC-844, "Diagnosis Procedure"

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

2009 Pathfinder

EC-844

< COMPONENT DIAGNOSIS >

[VK56DE]

P2135 TP SENSOR

P2135 TP SENSOR

Component Description

INFOID:0000000004333344

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 potentiometer which transform the throttle valve position
into output voltage, and emit the voltage signals to the ECM. The
ECM judges the current opening angle of the throttle valve from
these signals and controls the throttle valve in response to driving
conditions via the throttle control motor.

On Board Diagnosis Logic

INFOID:0000000003936828

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 illuminates.

DTC Confirmation Procedure

INFOID:0000000003936829

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
1.

Start engine and let it idle for 1 second.

Check DTC.

If DTC is detected, go to

Diagnosis Procedure

INFOID:0000000003936830

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten 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

2009 Pathfinder

P2135 TP SENSOR

EC-845

< COMPONENT DIAGNOSIS >

[VK56DE]