Infiniti QX56 (Z62). Manual - part 621

EC-462

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P2101 ELECTRIC THROTTLE CONTROL FUNCTION

2.

Disconnect electric throttle control actuator harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

5.

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

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace.

9.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 

1.

Remove the intake air duct.

2.

Check if foreign matter is caught between the throttle valve and the housing.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Remove the foreign matter and clean the electric throttle control actuator inside, then perform

throttle valve closed position learning. Refer to 

EC-147, "Work Procedure"

.

10.

CHECK THROTTLE CONTROL MOTOR

Refer to 

EC-462, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 12.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair or replace harness or connectors.

12.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace malfunction electric throttle control actuator. Refer to 

EM-30, "Removal and Installation"

.

2.

Perform 

EC-463, "Special Repair Requirement"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006217965

1.

CHECK THROTTLE CONTROL MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect electric throttle control actuator harness connector.

3.

Check the resistance between electric throttle control actuator terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F66

5

F110

57

Not existed

63

Existed

6

57

Existed

63

Not existed

Terminals

Resistance

5 and 6

Approx. 1 - 15 

Ω

 [at 25

°

C (77

°

F)]

P2101 ELECTRIC THROTTLE CONTROL FUNCTION

EC-463

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace electric throttle control actuator. Refer to 

EM-30, "Removal and Installation"

.

2.

Perform 

EC-463, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000006217966

1.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-147, "Work Procedure"

.

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-148, "Work Procedure"

.

>> END

EC-464

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P2118 THROTTLE CONTROL MOTOR

P2118 THROTTLE CONTROL MOTOR

DTC Logic

INFOID:0000000006217967

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 2 seconds.

2.

Start engine and let it idle for 5 seconds.

3.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-464, "DTC Logic"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217968

1.

CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect electric throttle control actuator harness connector.

2.

Disconnect ECM harness connector.

3.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

4.

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

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning part.

2.

CHECK THROTTLE CONTROL MOTOR

Refer to 

EC-465, "Component Inspection (Electric Throttle Control Motor)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK INTERMITTENT INCIDENT

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P2118

ETC MOT-B1
(Throttle control motor circuit 
short)

ECM detects short in both circuits between 
ECM and throttle control motor.

• Harness or connectors

(Throttle control motor circuit is shorted.)

• Electric throttle control actuator

(Throttle control motor)

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F66

5

F110

57

Not existed

63

Existed

6

57

Existed

63

Not existed

P2118 THROTTLE CONTROL MOTOR

EC-465

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness or connectors.

4.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace electric throttle control actuator. Refer to 

EM-30, "Removal and Installation"

.

>> INSPECTION END

Component Inspection (Electric Throttle Control Motor)

INFOID:0000000006217969

1.

CHECK THROTTLE CONTROL MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect electric throttle control actuator harness connector.

3.

Check resistance between electric throttle control actuator terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace electric throttle control actuator. Refer to 

EM-30, "Removal and Installation"

.

>> INSPECTION END

Terminals

Resistance

5 and 6

Approx. 1 - 15 

Ω

 [at 25

°

C (77

°

F)]