Nissan Altima L32. Manual - part 582

P2122, P2123 APP SENSOR

EC-1449

< COMPONENT DIAGNOSIS >

[VQ35DE]

C

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EC

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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, short to ground or short to power in

harness or connectors.

3.

CHECK APP SENSOR 1 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.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK APP SENSOR

Refer to 

EC-1450, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly.

2. Refer to 

EC-1450, "Special Repair Requirement"

.

>> INSPECTION END

7.

CHECK INTERMITTENT INCIDENT

APP sensor

Ground

Voltage (V)

Connector

Terminal

E40

5

Ground

Approx. 5

PBIA9607J

APP sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E40

4

E10

84

Existed

APP sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E40

3

E10

81

Existed

EC-1450

< COMPONENT DIAGNOSIS >

[VQ35DE]

P2122, P2123 APP SENSOR

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000004362324

1.

CHECK ACCELERATOR PEDAL POSITION SENSOR

1. Reconnect all harness connectors disconnected.

2. Turn ignition switch ON.

3. Check the voltage between ECM harness connector terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly.

2. Go to 

EC-1450, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000004362325

1.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Refer to 

EC-1053, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-

ment"

.

>> GO TO 2.

2.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-1053, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

.

>> GO TO 3.

3.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-1053, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

.

>> END

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

E10

81

(APP 

sensor 1 

signal)

84

(Sensor 
ground)

Accelerator 

pedal

Fully released

0.65 - 0.87

Fully de-

pressed

More than 

4.3

82

(APP 

sensor 2 

signal)

100

(Sensor 
ground)

Fully released

0.28 - 0.48

Fully de-

pressed

More than 

2.0

JMBIA1884ZZ

P2127, P2128 APP SENSOR

EC-1451

< COMPONENT DIAGNOSIS >

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P2127, P2128 APP SENSOR

Description

INFOID:0000000004362326

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 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 engine operations such as fuel cut.

DTC Logic

INFOID:0000000004362327

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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

>> Go to 

EC-1451, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362328

1.

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

PBIB1741E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P2127

Accelerator pedal posi-
tion sensor 2 circuit low 
input

An excessively low voltage from the APP sen-
sor 2 is sent to ECM.

• Harness or connectors

[Accelerator pedal position (APP) sensor 
2 circuit is open or shorted.]
[Crankshaft position (CKP) sensor (POS) 
circuit is shorted.]
(EVAP control system pressure sensor 
circuit is shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)

• APP sensor 2
• CKP sensor (POS)
• EVAP control system pressure sensor
• Refrigerant pressure sensor

P2128

Accelerator pedal posi-
tion sensor 2 circuit high 
input

An excessively high voltage from the APP sen-
sor 2 is sent to ECM.

EC-1452

< COMPONENT DIAGNOSIS >

[VQ35DE]

P2127, P2128 APP SENSOR

2. Check ground connection E9. Refer to Ground Inspection in 

GI-45, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

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 6.

NO

>> GO TO 3.

3.

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 4.

NO

>> Repair open circuit.

4.

CHECK SENSOR POWER SUPPLY CIRCUIT

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK COMPONENTS

Check the following.

• Crankshaft position sensor (POS) (Refer to 

EC-1295, "Component Inspection"

.)

• EVAP control system pressure sensor (Refer to 

EC-1334, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

EC-1503, "Diagnosis Procedure"

.)

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace malfunctioning components.

6.

CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

APP sensor

Ground

Voltage (V)

Connector

Terminal

E40

6

Ground

Approx. 5

JMBIA1609ZZ

APP sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E40

6

E10

87

Existed

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F13

72

Refrigerant pressure sensor

E219

1

76

CKP sensor (POS)

F30

1

E10

87

APP sensor

E40

6

91

EVAP control system pressure sensor

B41

3