DTC 0403

COMPONENT DESCRIPTION
The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage and emits the voltage signal to the ECM. In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This controls engine operation such as fuel cut. The throttle position sensor unit contains a built-in "Wide open and closed throttle position switch".




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values




ON BOARD DIAGNOSIS LOGIC
Engine operating condition in fail-safe mode
Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.

Condition / Driving Condition
When Engine is Idling / Normal
When accelerating / Poor accelerating

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the throttle position sensor circuit. During this check, a 1st trip DTC might not be confirmed.

With CONSULT
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.
(3) Turn ignition switch "ON".




(4) Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT
(5) Select "THRTL POS SEN" and "AE3SOL TH.P/S" in "DATA MONITOR" mode with CONSULT.
(6) Press RECORD on CONSULT SCREEN at the same time accelerator pedal is depressed.




(7) Print out the recorded data and check the following:
- The voltage when accelerator pedal fully released is 0.3 - 0.7V.
- The voltage rise is linear in response to accelerator pedal depression.
- The voltage when accelerator pedal fully depressed is approximately 4V.

OR

Without CONSULT
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.
(3) Turn ignition switch "ON".




(4) Check the voltage between ECM terminal (23) and (43) (ground) and check the following:
- The voltage when accelerator pedal fully released is 0.3 - 0.7V.
- The voltage rise is linear in response to accelerator pedal depression.
- The voltage when accelerator pedal fully depressed is approximately 4V.

EC-TPS-01 Throttle Position (DTC P0120):

WIRING DIAGRAM







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Throttle Position Sensor
1. Start engine and warm it up sufficiently.
2. Turn ignition switch "OFF".
3. Disconnect throttle position sensor harness connector.




4. Check resistance between terminals 2 and 3 while opening throttle valve manually.

Throttle Valve conditions / Resistance at 25°C(77°F)
Completely closed / Approximately 0.5 k Ohms
Partially open / 0.5 - 0.4 K Ohms
Completely open / Approximately 4.0 K Ohms

If NG, replace throttle position sensor.
To adjust throttle position sensor, perform "BASIC INSPECTION".