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Component Description
NFEC1298
Electric Throttle Control Actuator consists of throttle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle
valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle
valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening
angle properly in response to driving condition.
On Board Diagnosis Logic
NFEC1299
DTC No.
Trouble diagnosis
name
DTC detecting condition Possible cause
P1121
1121
Electric throttle control
actuator
A)
Electric throttle control actuator does not func-
tion properly due to the return spring malfunc-
tion.
I Electric throttle control actuatorB)
Throttle valve opening angle in fail-safe mode
is not in specified range.
C)
ECM detect the throttle valve is stuck open.
This self-diagnosis has the one trip detec-
tion logic.
FAIL-SAFE MODE
When the malfunction A or B is detected, ECM enters in fail-safe mode.
When the malfunction C is detected, ECM enters in fail-safe mode and the MIL lights up.
Detected items Engine operating condition in fail-safe mode
Malfunction A
The ECM controls the electric throttle throttle actuator by regulating the throttle opening around the idle
position. The engine speed will not rise more than 2,000 rpm.
Malfunction B ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
Malfunction C
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls.
The engine can restart in “N” or “P” position, and engine speed will not exceed 1,000 rpm or more.
DTC Confirmation Procedure
NFEC1300
NOTE:
I Perform “PROCEDURE FOR MALFUNCTION A AND B”
first. If the 1st trip DTC cannot be confirmed, perform
“PROCEDURE FOR MALFUNCTION C”.
If there is no problem on “PROCEDURE FOR MALFUNC-
TION A AND B”, perform “PROCEDURE FOR MALFUNC-
TION C”.
I If “DTC Confirmation Procedure” has been previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
SEF058Y
PROCEDURE FOR MALFUNCTION A AND B
With CONSULT-II
1) Turn ignition switch “ON” and wait at least 1 second.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Shift selector lever to “D” position and wait at least 2 seconds.
4) Turn ignition switch “OFF”, wait at least 10 seconds, and then
turn “ON”.
5) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-472.
With GST
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR
Component Description
EC-471
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