Nissan X-Trail 32. Manual - part 986

P0638 ELECTRIC THROTTLE CONTROL ACTUATOR FUNCTION

EC-1073

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

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P0638 ELECTRIC THROTTLE CONTROL ACTUATOR FUNCTION

DTC Description

INFOID:0000000010935759

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Electric throttle control actuator
• Throttle valve stuck
• Throttle chamber clogged

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• CSF regeneration forbidden
• Compression test routine inhibited
• Airflow regulation cut off
• CCSL deactivation with dashboard message
• Freeshift inhibited

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P0638 is displayed with DTC P0120 or P2100, first perform the trouble diagnosis for DTC P0120 or
P2100.
Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 3 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-1073, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010935760

1.

CHECK DTC PRIORITY

If DTC P0638 is displayed with DTC P0120 or P2100, first perform the trouble diagnosis for DTC P0120 or
P2100.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0638

INLET AIR FLAP POSITION CTRL
(Throttle actuator control range/perfor-
mance bank 1)
• 1.DEF: NO RESPONSE FROM THE 

VALVE MOTOR

• 2.DEF: INLET FLAP BLOCKED 

CLOSED

• 3.DEF: INLET FLAP BLOCKED OPEN
• 4.DEF: CLOSING OF AIR INLET FLAP

• Throttle valve regulation error
• ECM detects an incorrect closed position of the throttle valve.
• ECM detects an incorrect fully open position of the throttle valve.

EC-1074

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P0638 ELECTRIC THROTTLE CONTROL ACTUATOR FUNCTION

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-908, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK ECM HARNESS CONNECTOR CONNECTIONS

1.

Turn ignition switch OFF.

2.

Check ECM harness connector connection.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR HARNESS CONNECTOR CONNECTIONS

Check electric throttle control actuator harness connector connection.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check electric throttle control actuator circuit for open and short.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

DTC CONFIRMATION PROCEDURES

1.

Erase DTC.

2.

Perform DTC confirmation procedure again. Refer to 

EC-1073, "DTC Description"

.

Is the DTC P0638 displayed again?

YES

>> GO TO 6.

NO

>> INSPECTION END

6.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR

Perform 

EC-1011, "Component Inspection (Throttle Position Sensor)"

 (throttle position sensor), 

EC-1177,

"Component Inspection"

 (throttle control motor).

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 7.

7.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace electric throttle control actuator.

2.

Perform 

EC-949, "Work Procedure"

.

>> INSPECTION END

+

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Continuity

ECM

Electric throttle control actu-

ator

Connector

Terminal

Connector

Terminal

F118

103

F153

2

Existed

107

3

108

1

140

5

152

4

P0641 SENSOR POWER SUPPLY

EC-1075

< DTC/CIRCUIT DIAGNOSIS >

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P0641 SENSOR POWER SUPPLY

DTC Description

INFOID:0000000010935761

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (The sensor power supply 1 circuit is shorted.)
• High pressure EGR volume control valve position sensor
• Throttle position sensor
• Intake manifold runner control valve position sensor
• DPF differential pressure sensor
• TC boost sensor
• Low pressure EGR volume control valve position sensor
• Camshaft position sensor
• APP sensor 1

FAIL-SAFE

• EGR valve is closed position
• Throttle control motor is opened
• The pressure downstream turbo exists then the limit: Otherwise cut regulation turbo
• Limited upstream turbine pressure regulation if the sensor is present: Otherwise, the boost pressure regula-

tion is cut

• Torque limitation
• Airflow regulation cut off
• CSF regeneration forbidden
• CCSL deactivation with dashboard message
• Freeshift inhibited
• Increased idle speed
• After sales routines forbidden

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-1075, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010935762

1.

CHECK SENSOR POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector and ground.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0641

SEN SUPPLY N-1 VOL
(Sensor reference voltage “A” circuit/open) 
• 1.DEF: VOLTAGE TOO LOW
• 2.DEF: VOLTAGE TOO HIGH

• A voltage of sensor power supply is 5.3 V or more.
• A voltage of sensor power supply is 4.7 V or less.

EC-1076

< DTC/CIRCUIT DIAGNOSIS >

[R9M]

P0641 SENSOR POWER SUPPLY

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK SENSOR POWER SUPPLY CIRCUITS

1.

Turn ignition switch OFF.

2.

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

*1: CVT models
*2: M/T models

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK COMPONENTS

Check the following.
• Accelerator pedal position sensor (sensor 1). Proceed to 

EC-1180, "Diagnosis Procedure"

.

• Low pressure EGR volume control valve position sensor. Proceed to 

EC-1108, "Component Inspection (Low

Pressure EGR Volume Control Valve Motor)"

.

• Camshaft position sensor. Proceed to 

EC-1035, "Component Inspection (Camshaft Position Sensor)"

.

• Turbocharger boost sensor. Proceed to 

EC-1002, "Component Inspection (Turbocharger Boost Sensor)"

.

• MAF sensor. Proceed to 

EC-998, "Component Inspection (Mass Air Flow Sensor)"

.

• DPF pressure sensor. Proceed to 

EC-1193, "Diagnosis Procedure"

.

• High pressure EGR volume control valve position sensor. Proceed to 

EC-1044, "Diagnosis Procedure"

.

• Throttle position sensor. Proceed to 

EC-1011, "Component Inspection (Throttle Position Sensor)"

.

• Intake manifold runner control valve position sensor. Proceed to 

EC-1092, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning component.

+

−

Voltage

(Approx.)

ECM

Connectors

Terminal

E79

6

Ground

5 V

F117

55

59

F118

100

108

112

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

E79

6

Accelerator pedal position sensor (sensor 1)

E110

*1

E167

*2

4

F117

55

Low pressure EGR volume control valve position sensor

F155

1

Camshaft position sensor

F151

1

59

Turbocharger boost sensor

F146

3

MAF sensor

F152

3

F118

100

DPF differential pressure sensor

F88

1

108

High pressure EGR volume control valve position sensor

F156

4

Throttle position sensor

F153

1

112

Intake manifold runner control valve position sensor

F147

1