Infiniti M45 (Y34). Manual — part 438
DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR
EC-441
C
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EC
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.
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
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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EC
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
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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