Code 0403

DTC 0403 Throttle Position Sensor




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 sensor controls engine operation such as fuel cut. On the other hand, the "Wide open and closed throttle position switch", which is built into the throttle position sensor unit, is not used for engine control.




Consult Reference Value In Data Monitor Mode
Specification data are reference values.







ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 3 (ECCS ground).







On Board Diagnosis Logic

DTC Confirmation Procedure

NOTE:
- If both DTC P0120 (0403. and DTC P0510 (0203. are displayed, first perform "DTC P0510 CLOSED THROTTLE POSITION SWITCH".
- Perform "PROCEDURE FOR MALFUNCTION A" first. If the 1st trip DTC cannot be confirmed, perform "PROCEDURE FOR MALFUNCTION B". If there is no problem on "PROCEDURE FOR MALFUNCTION B", perform "PROCEDURE FOR MALFUNCTION C".
- If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

CAUTION: Always drive vehicle at a sate speed.

TESTING CONDITION:
- Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
- This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.




With CONSULT
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
2. Start engine and maintain the following conditions for at least 5 consecutive seconds.
Vehicle speed: More than 4 km/h (2 MPH) Selector lever:
Suitable position except "P" or "N" position

With GST
1. Start engine and maintain the following conditions for at least 5 consecutive seconds.
Vehicle speed: More than 4 km/h (2 MPH) Selector lever:
Suitable position except "P" or "N" position
2. Select "MODE 7" with GST.

No Tools
1. Start engine and maintain the following conditions for at least 5 consecutive seconds.
Vehicle speed: More than 4 km/h (2 MPH) Selector lever:
Suitable position except "P" or "N" position
2. Turn ignition switch "OFF" and wait at least 5 seconds.
3. Turn ignition switch "ON" and perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

PROCEDURE FOR MALFUNCTION B




With CONSULT
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.
3. Start engine and let it idle for at least 10 seconds.

With GST
1. Start engine and let it idle for at least 10 seconds.
2. Select "MODE 7" with GST.

No Tools
1. Start engine and let it idle for at least 10 seconds.
2. Turn ignition switch "OFF' and wait at least 5 seconds.
3. Turn ignition switch "ON" and perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

PROCEDURE FOR MALFUNCTION C

CAUTION: Always drive vehicle at a sate speed.










With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 5 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 "ABSOL THP/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 graph and check the following:
- The voltage rise is linear in response to accelerator pedal depression.
- The voltage when accelerator pedal is fully depressed is approximately 4V.
If NG, go to "Diagnostic Procedure". If OK, go to following step.
8. Select "AUTO TRIG" in "DATA MONITOR" mode with CONSULT
9. Maintain the following conditions for at least 10 consecutive seconds.
CMPS-RPM (REF): More than 2,000 rpm MAS AIR/FL SE: More than 3V COOLAN TEMP/S: More than 70°C (158°F) IACV-AAC/V: Less than 80% Selector lever: Suitable position Driving location:
Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.

With GST
1. Start engine and warm it up to normal operating temperature.
2. Maintain the following conditions for at least 10 consecutive seconds.
Gear position: Suitable position
Engine speed: More than 2,000 rpm







Voltage between ECM terminal 54 (Mass air flow sensor signal) and ground:
More than 3V
Voltage between ECM terminal 101 (IACV-AAC valve signal) and ground:
More than 4V
3. Select "MODE 7" with GST.

No Tools
1. Start engine and warm it up to normal operating temperature.
2. Maintain the following conditions for at least 10 consecutive seconds.
Gear position: Suitable position
Engine speed: More than 2,000 rpm







Voltage between ECM terminal 54 (Mass air flow sensor signal) and ground:
More than 3V
Voltage between ECM terminal 101 (IACV-AAC valve signal) and ground:
More than 4V
3. Stop the vehicle, turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
4. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

Steps 1 - 6:

Steps 7 - 14:

Diagnostic Procedure




Wiring Diagram

Component Inspection







1. Disconnect throttle position sensor harness connector.
2. Make sure that resistance between terminals 2 and 3 changes when opening throttle valve manually.
If NG, replace throttle position sensor. To adjust it, perform "Basic Inspection".