VERACRUZ(EN) >2009 > G 3.8 DOHC > Fuel System > Engine Control System>P1523 Throttle Actuator Control System - Throttle Valve Stuck  
Component Location

General Description
The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2. The throttle body contains the actuator, the throttle plate and the throttle position sensor (potentiometer), which are integrated in one housing. The actuator consists of a DC motor with a two-stage gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. And it provides feedback to the PCM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
DTC Description
Checking throttle valve return state, under detecting condition, if an output signal is within the threshold value for more than designated time, PCM sets P1523.
DTC Detecting Condition
Item
 Detecting Condition
 Possible cause
DTC Strategy
•
Monitor throttle valve return state
•
Carbon in throttle
•
Broken Throttle return spring
•
throttle sticky
•
throttle icy
•
PCM
EnableConditions
•
ETC Power Control Mode
•
TPS 1 & 2 = normal
•
Sensor Supply voltage = Normal
Threshold value
•
The throttle did not return to default range within 1 to 4 seconds of turning off. That is, (TPS1's signal > 0.9V AND TPS1's signal < 1.85V) or (TPS2's signal < 1.85V AND TPS2's signal > 0.9V) when the power to the ETC motor is turned off.
DiagnosisTime
•
Continuous
MIL On Condition
•
DTC only (NO MIL ON)

Specification
Throttle opening ( ° )
 Output voltage (V) [Vref = 5.0V]
TPS1
 TPS2
0°
 0.0V
 5.0V
10°
 0.5V
 4.5V
20°
 0.9V
 4.1V
30°
 1.4V
 3.6V
40°
 1.8V
 3.2V
50°
 2.3V
 2.7V
60°
 2.7V
 2.3V
70°
 3.2V
 1.8V
80°
 3.6V
 1.4V
90°
 4.1V
 0.9V
100°
 4.5V
 0.5V
110°
 5.0V
 0.0V

Signal Wavefrom And Data

Monitor DTC Status
1.
Check DTC Status
(1)
Connect scantool to Data Link Connector(DLC).
(2)
IG "ON".
(3)
Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
(4)
Read "DTC Status" parameter.

(5)
Is parameter displayed "Present fault"?

 ▶ Go to "System Inspection" procedure.

 ▶ Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

System Inspection
1.
Visual Inspection
(1)
IG "OFF".
(2)
Check throttle valve after removing air duct.
A.
Carbon deposit.
B.
Throttle icy
C.
Broken return spring.
D.
Throttle sticky
(3)
Is the throttle valve return O.K ?

 ▶ Verify that throttle movement is not obstructed and perform ETS Initialization as follows and then, go to "Verification of Vehicle Repair" procedure.

 ▶ Repair or replace as necessary and then, do ETS Initialization" as follows. then, go to "Verification of Vehicle Repair" procedure.

※ Procedure of ETS Initialization
1. Erase the trouble codes on PCM
2. Turn the ignition key off and keep this condition until the main relay is turned off.(10 sec.)
3. Turn ignition key on more than 1second to record the throttle motor position on the EEPROM
Verification Of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1.
Connect scantool and select "DTC" button.
2.
Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
3.
Read "DTC Status" parameter
4.
Is parameter displayed "History(Not Present) fault"?

 ▶ System performing to specification at this time. Clear the DTC

 ▶ Go to the applicable troubleshooting procedure.