Nissan X-Trail 32. Manual - part 811

P2122, P2123 APP SENSOR

EC-373

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

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5.

CHECK APP SENSOR INPUT SIGNAL CIRCUIT

1.

Check the continuity between APP sensor harness connector and ECM harness connector.

2.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning part.

6.

CHECK APP SENSOR

Check the APP sensor. Refer to 

EC-373, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

Component Inspection

INFOID:0000000010775268

1.

CHECK ACCELERATOR PEDAL POSITION SENSOR

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Turn ignition switch ON.

4.

Check the voltage between ECM harness connector terminals as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

CVT models

E110

3

E16

126

Existed

M/T models

E167

ECM

Condition

Voltage

(Approx.)

Connector

+

–

Terminal

E16

126

127

Accelerator pedal

Fully released

0.6 - 0.9 V

Fully depressed

3.9 - 4.7 V

119

120

Fully released

0.3 - 0.6 V

Fully depressed

1.95 - 2.4 V

EC-374

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P2127, P2128 APP SENSOR

P2127, P2128 APP SENSOR

DTC Description

INFOID:0000000010775269

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors
- APP sensor 2 circuit is open or shorted.
- Sensor power supply 2 circuit is shorted.
• Accelerator pedal position sensor (APP sensor 2)
• Sensor power supply 2 circuit

FAIL-SAFE

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 8 V.

>> 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

>> Proceed to 

EC-375, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P2127

APP SEN 2/CIRC
(Throttle/pedal position sensor/switch “E” 
circuit low)

An excessively low voltage from the APP sensor 2 is sent to ECM.

P2128

APP SEN 2/CIRC
(Throttle/pedal position sensor/switch “E” 
circuit high)

An excessively high voltage from the APP sensor 2 is sent to ECM.

Engine operating condition in fail-safe mode

Fail safe mode

Vehicle behavior

Others

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. 
Therefore, the acceleration will be poor. 
NOTE:
If accelerator pedal position sensor 1 and 2 malfunction at the same time conducts following con-
trol.
• ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed 

opening (approx. 5 degrees) by the return spring.

P2127, P2128 APP SENSOR

EC-375

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

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Diagnosis Procedure

INFOID:0000000010775270

1.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-1

1.

Turn ignition switch OFF.

2.

Disconnect accelerator pedal position (APP) sensor harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between APP sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-2

Check the voltage between APP sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-3

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 4.

NO

>> Repair or replace malfunctioning part.

4.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Perform 

EC-405, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace malfunctioning part.

5.

CHECK APP SENSOR 2 GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

APP sensor

Voltage

(Approx.)

Connector

+

−

Terminal

CVT models

E110

5

1

5  V

M/T models

E167

+

−

Voltage

(Approx.)

APP sensor

Connector

Terminal

CVT models

E110

5

Ground

5  V

M/T models

E167

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

CVT models

E110

5

E16

118

Existed

M/T models

E167

EC-376

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P2127, P2128 APP SENSOR

3.

Check the continuity between APP sensor harness connector and ECM harness connector.

4.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning part.

6.

CHECK ECM GROUND CIRCUIT

Check the continuity between ECM harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace malfunctioning part.

7.

CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT

1.

Check the continuity between APP sensor harness connector and ECM harness connector.

2.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace malfunctioning part.

8.

CHECK APP SENSOR

Check the APP sensor. Refer to 

EC-376, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

Component Inspection

INFOID:0000000010775271

1.

CHECK ACCELERATOR PEDAL POSITION SENSOR

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Turn ignition switch ON.

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

CVT models

E110

1

E16

120

Existed

M/T models

E167

+

−

Continuity

ECM

Connector

Terminal

F7

11

Ground

Existed

E16

123

125

128

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

CVT models

E110

6

E16

119

Existed

M/T models

E167