P1121

P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

Description
Electric Throttle Control Actuator consists of throttle control motor, acceleration pedal position sensor, throttle position sensor, etc.

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.

Accelerator pedal position sensor detects the accelerator pedal position, the opening and closing speed of the accelerator pedal and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.

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
Malfunction is detected when
(Malfunction A) electric throttle control actuator does not function properly due to the return spring malfunction,
(Malfunction B) throttle valve opening angle in fail-safe mode is not in specified range,
(Malfunction C) ECM detect the throttle valve is stuck open.

Fail-Safe Mode:

Possible Cause
- Electric throttle control actuator

DTC Confirmation Procedure

NOTE:
- 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 MALFUNCTION A AND B", perform "PROCEDURE FOR MALFUNCTION C".
- If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A AND B

With CONSULT-II
1. Turn ignition witch "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".

With GST
Follow the procedure "WITH CONSULT-II" above.

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. Shift selector lever to "D" position and wait at least 2 seconds.
4. Shift selector lever to "N" or "P" position.
5. Start engine and let it idle for 3 seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
Follow the procedure "With CONSULT-II" above.

Step 1 - 2:

Diagnostic Procedure