Infiniti M45 (Y34). Manual - part 438

 

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Infiniti M45 (Y34). Manual - part 438

 

 

DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

EC-441

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PROCEDURE FOR MALFUNCTION C

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Set selector lever to D position and wait at least 3 seconds.

4.

Set selector lever to N or P position.

5.

Start engine and let it idle for 3 seconds.

6.

If DTC is detected, go to 

EC-441, "Diagnostic Procedure"

 .

 With GST

Follow the procedure With CONSULT-II above.

Diagnostic Procedure

ABS002NF

1. 

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Remove the intake air duct.

2.

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

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-44, "Idle Air Volume Learning"

 .

>> INSPECTION END

SEF058Y

PBIB0083E

EC-442

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

PFP:16119

Description

ABS002NG

NOTE:
If DTC P1122 is displayed with DTC P1121 or 1126, first perform the trouble diagnosis for DTC P1121 or
P1126. Refer to 

EC-440

 or 

EC-449

 .

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor, etc.
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

ABS002NH

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

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

DTC Confirmation Procedure

ABS00A2N

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V when engine
is running.

 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-444, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure WITH CONSULT-II above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1122
1122

Electric throttle control 
performance problem

Electric throttle control function does not 
operate properly.

Harness or connectors
(Throttle control motor circuit is open or shorted)

Electric throttle control actuator

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 P1122 ELECTRIC THROTTLE CONTROL FUNCTION

EC-443

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Wiring Diagram

ABS002NJ

TBWA0298E

EC-444

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

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

ABS002NK

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "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)

26

OR

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]

0 - 1.0V

151

L/B

Throttle control motor 
(Open)

[Ignition switch ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully depressed

0 - 14V

153

B

Throttle control motor 
ground

[Ignition switch: ON]

Approximately 0V

154

L/W

Throttle control motor 
(Close)

[Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully released

0 - 14V

157

L

Throttle control motor relay 
power supply

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

PBIB0058E

PBIB0061E

PBIB1118E

 

 

 

 

 

 

 

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