Nissan X-Trail 32. Manual - part 907

P2122, P2123 APP SENSOR

EC-757

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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EC

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P2122, P2123 APP SENSOR

DTC Description

INFOID:0000000010986465

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (APP sensor 1 circuit is open or shorted.)
• Accelerator pedal position sensor (APP sensor 1)

FAIL-SAFE

• 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.

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-707, "DTC Description"

.

NO

>> GO TO 2.

2.

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 at idle.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-757, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010986466

1.

CHECK DTC PRIORITY

If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-707, "DTC Description"

.

NO

>> GO TO 2.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P2122

APP SEN 1/CIRC
(Throttle/pedal position sensor/switch 

″

D

″

 

circuit low)

An excessively low voltage from the APP sensor 1 is sent to ECM.

P2123

APP SEN 1/CIRC
(Throttle/pedal position sensor/switch 

″

D

″

 

circuit high)

An excessively high voltage from the APP sensor 1 is sent to ECM.

EC-758

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P2122, P2123 APP SENSOR

2.

CHECK APP SENSOR 1 POWER SUPPLY

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 4.

NO

>> GO TO 3.

3.

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

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

4.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

4.

CHECK APP SENSOR 1 GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

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

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

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?

+

−

Voltage

(Approx.)

APP sensor

Connector

Terminal

E110

4

Ground

5 V

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

E110

4

E60

122

Existed

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

E110

2

E60

127

Existed

+

−

Continuity

APP sensor

ECM

Connector

Terminal

Connector

Terminal

E110

3

E60

126

Existed

P2122, P2123 APP SENSOR

EC-759

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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EC

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YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK APP SENSOR

Check the APP sensor. Refer to 

EC-759, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010986467

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"

.

ECM

Condition

Voltage

Connector

+

−

Terminal

Sensor 1

E60

126

127

Accelerator pedal

Fully released

0.5 - 1.0 V

Fully depressed

4.2 - 4.8 V

Sensor 2

119

120

Fully released

0.25 - 0.5 V

Fully depressed

2.0 - 2.5 V

EC-760

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P2127, P2128 APP SENSOR

P2127, P2128 APP SENSOR

DTC Description

INFOID:0000000010986468

DTC DETECTION LOGIC

POSSIBLE CAUSE

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

FAIL-SAFE

• 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.

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 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

>> Proceed to 

EC-760, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010986469

1.

CHECK APP SENSOR 2 POWER SUPPLY

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.

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.

+

−

Voltage

(Approx.)

APP sensor

Connector

Terminal

E110

5

Ground

5 V