Infiniti Q45. Manual - part 500

DTC P2101 ELECTRIC THROTTLE CONTROL FUNCTION

EC-639

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Component Inspection

NBS001ZT

THROTTLE CONTROL MOTOR RELAY

1.

Apply 12V direct current between relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 5.

3.

If NG, replace throttle control motor relay.

THROTTLE CONTROL MOTOR

1.

Disconnect electric throttle control actuator harness connector.

2.

Check resistance between terminals 3 and 6.

3.

If NG, replace electric throttle control actuator and go to next
step.

4.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

5.

Perform 

EC-78, "Idle Air Volume Learning"

 .

Removal and Installation

NBS001ZU

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-19, "INTAKE MANIFOLD"

 .

Conditions

Continuity

12V direct current supply between terminals 
1 and 2

Yes

No current supply

No

PBIB0098E

Resistance: Approximately 1 - 15 

Ω

 [at 25 

°

C (77

°

F)]

PBIB0095E

EC-640

DTC P2118 THROTTLE CONTROL MOTOR

DTC P2118 THROTTLE CONTROL MOTOR

PFP:16119

Component Description

NBS00202

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed-
back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in
response to driving condition.

On Board Diagnosis Logic

NBS00203

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

DTC Confirmation Procedure

NBS00204

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

 WITH CONSULT-II

1.

Turn ignition switch ON and wait at least 2 seconds.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 5 seconds.

4.

If DTC is detected, go to 

EC-642, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P2118
2118

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)

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return 
spring.

SEF058Y

DTC P2118 THROTTLE CONTROL MOTOR

EC-641

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Wiring Diagram

NBS00205

TBWM1239E

EC-642

DTC P2118 THROTTLE CONTROL MOTOR

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

NBS00206

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.
Refer to 

EC-154, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

3

L

Throttle control motor relay 
power supply

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

4

L/W

Throttle control motor 
(Close)

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D 

●

Accelerator pedal: Released

0 - 14V

5

L/B

Throttle control motor 
(Open)

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D 

●

Accelerator pedal: Fully depressed

0 - 14V

104

OR

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]

0 - 1.0V

PBIB1104E

PBIB1105E

PBIB2417E