Infiniti F50. Manual - part 449

 

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Infiniti F50. Manual - part 449

 

 

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

EC-437

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DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

PFP:16119

Description

EBS00MHN

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

EC-435

  or 

EC-444

 .

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

EBS00MHO

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

EBS00MHP

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-439, "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

EC-438

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

Wiring Diagram

EBS00MHQ

TBWM0121E

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

EC-439

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Specification data are reference values and are measured between each terminal and ground.

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

EBS00MHR

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

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 is 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 is released

0 - 14V

157

L

Throttle control motor relay 
power supply

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

PBIB0058E

PBIB0061E

PBIB1118E

EC-440

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

2. 

CHECK THROTTLE CONTROL MOTOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 153 and engine ground. 
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 3.

NG

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

3. 

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY

1.

Disconnect throttle control motor relay harness connector.

2.

Check voltage between throttle control motor relay terminals 2, 3
and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

15A fuse

Harness for open or short between throttle control motor relay and battery

>> Repair or replace harness or connectors.

5. 

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check continuity between ECM terminal 157 and throttle control motor relay terminal 5.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

Continuity should exist.

PBIB0031E

Voltage: Battery voltage

PBIB0097E

Continuity should exist.

 

 

 

 

 

 

 

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