DTC 0403

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".




CONSULT REFERENCE VALUE IN DATA MONITOR MODE




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




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 acceleration

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

With Consult
(1) Turn ignition switch "ON".
(2) Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT.
(3) Select "THRTL POS SEN" and "ABSOL TH-PS" in "DATA MONITOR" mode with CONSULT.




(4) Press RECORD on CONSULT SCREEN at the same time accelerator pedal is depressed.
(5) Print out the recorded data and check the following:
- The voltage when accelerator pedal fully released is approximately 0.35 - 0.65V.




- The voltage rise is linear in response to accelerator pedal depression.
- The voltage when accelerator pedal fully depressed is approximately 4V.

OR

No Tools
(1) Turn ignition switch "ON".




(2) Check the voltage between ECM terminal (23) and (43) (ground) and check the following:
- The voltage when accelerator pedal fully released is approximately 0.35 - 0.65V.
- The voltage rise is linear in response to accelerator pedal depression.
- The voltage when accelerator pedal fully depressed is approximately 4V.




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION

Throttle position sensor
1. Disconnect throttle position sensor harness connector.




2. Make sure that resistance between terminals 2 and 3 changes when opening throttle valve manually.

Throttle valve conditions / Resistance [at 25°C (77°F)]
Completely closed / Approximately 0.6 K Ohms
Partially open / 0.6 - 4.0 K Ohms
Completely open / Approximately 4.0 K Ohms

If NG, replace throttle position sensor. To adjust it, perform "Basic Inspection".