Throttle Position Sensor: Testing and Inspection

***See Also TSB 05-36-002 for further information***


THROTTLE POSITION (TP) SENSOR




The TPS is a variable resistor type that rotates with the throttle shaft to sense the throttle valve angle. As the throttle shaft rotates, the output voltage of the TPS changes. The PCM detects the throttle valve opening based on this voltage change.

Circuit Diagram:

CIRCUIT DIAGRAM

HARNESS INSPECTION PROCEDURES

Refer to "P0122, P0123, P0222, P0223" DTC inspection procedures.

TROUBLESHOOTING HINTS

The TPS signal is important in the control of the automatic transaxle. Shift shock and other trouble will occur if the sensor is faulty.

SENSOR CHECKING

Using Hi-Scan (Pro):

USING HI-SCAN-PRO

USING VOLTMETER

1. Disconnect the throttle position sensor connector
2. Measure resistance between terminal 3 (sensor ground) and terminal 1 (sensor power).

Standard value : 3.5 - 6.5 k Ohm

3. Connect a pointer type ohmmeter between terminal 3 (sensor ground) and terminal 2 (sensor output).

4. Operate the throttle valve slowly from the idle position to the full open position and check that the resistance changes smoothly in proportion with the throttle valve opening angle.




5. If the resistance is out of specification, or fails to change smoothly, replace the throttle position sensor.

Tightening torque
TP Sensor: 1.5-2.5 Nm (15-25 kg.cm, 1.1-1.8 lb.ft)

INSPECTION




1. Connect a HI-SCAN (PRO) to the data link connector.

NOTE:: Before inspecting the TPS, verity the basic idle speed is as specified.




2. If a HI-SCAN (PRO) is not used, connect original type voltmeter between ground and IPS output terminal.

3. Turn the ignition switch to the ON position(do not start engine) and check that TPS output voltage is as specified. If a HI-SCAN (PRO) is used, read the IPS voltage.

Standard value (ETS vehicle): 300 - 900mV

4. If it is out of specification, loosen TPS mounting screws and adjust by turning the TPS
5. Turn the ignition switch to the OFF position.