Code 0203

COMPONENT DESCRIPTION
A closed throttle position switch and wide open throttle position switch are built into the throttle position sensor unit. The wide open throttle position switch is used only for A/T control.
When the throttle valve is in the closed position, the closed throttle position switch sends a voltage signal to the ECM. The ECM only uses this signal to open or close the EVAP canister purge control valve when the throttle position sensor is malfunctioning.




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 128 (ECM ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.








With Consult
1. Start engine and warm it up to normal operating temperature.
2. Check voltage between ECM terminal 74 and ground under the following conditions.
At idle: Battery voltage
At 2,000 rpm: 0 - 1V
If the check result is NG, go to "DIAGNOSTIC PROCEDURE".
If OK, go to following step.
3. Select "DATA MONITOR" mode with CONSULT at the start of the test.
4. Drive the vehicle for at least 5 consecutive seconds under the following condition.
THRTL POS SEN: More than 1.8V
VHCL SPEED SE: More than 4 KPH (2 MPH)
Selector lever: Suitable position
Driving pattern: Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.
5. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

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

Without Consult
1. Start engine and warm it up to normal operating temperature.
2. Check the voltage between ECM terminal 74 and ground under the following conditions.
At idle: Battery voltage
At 2,000 rpm: Approximately 0V
3. If NG, go to "DIAGNOSTIC PROCEDURE".







WIRING DIAGRAM




DIAGNOSTIC PROCEDURE




COMPONENT INSPECTION

Closed throttle position switch (Built in throttle position sensor)
1. Start engine and warm it up to normal operating temperature.
2. Stop engine (Ignition switch "OFF").
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than -40.0 kPa (-300 mmHg, -11.81 inHg)] until the throttle drum becomes free from the rod of the throttle opener.
6. Turn ignition switch "ON".








With Consult
7. Select "DATA MONITOR" mode with CONSULT.
8. Check indication of "CLSD THL/PSW".
Measurement must be made with closed throttle position switch installed in vehicle.
If NG, adjust closed throttle position switch. Refer to "Basic Inspection".
9. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace closed throttle position switch.

OR








Without Consult
6. Disconnect closed throttle position switch harness connector.
7. Check continuity between closed throttle position switch terminals 06 and 08.
Resistance measurement must be made with closed throttle position switch installed in vehicle.
If NG, adjust closed throttle position switch. Refer to "Basic Inspection".
8. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace closed throttle position switch.




Throttle position sensor

1. Start engine and warm it up to normal operating temperature.
2. Stop engine (Ignition switch "OFF").
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than -40.0 kPa (-300 mmHg, -11.81 inHg)] until the throttle drum becomes free from the rod of the throttle opener.
6. Turn ignition switch "ON".








With Consult
7. Select "DATA MONITOR" mode with CONSULT.
8. Check voltage of "THRTL POS SEN".
Voltage measurement must be made with throttle position sensor installed in vehicle.
If NG, adjust closed throttle position switch. Refer to "Basic Inspection".
9. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace throttle position sensor.

OR








Without Consult
7. Check voltage between ECM terminal 63 (Throttle position sensor signal) and ground.
Voltage measurement must be made with throttle position sensor installed in vehicle.
If NG, adjust closed throttle position switch. Refer to "Basic Inspection".
8. If it is impossible to adjust closed throttle position switch in "Basic Inspection", replace throttle position sensor.