A 5 volt power supply is applied to the Throttle Position Sensor (TPS) power terminal from the ECM/PCM. The ground terminal is grounded with ECM/PCM. When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the TPS output terminal and the ground terminal would increase according to the rotation.
Removal & Installation
- Disconnect negative battery cable.
- Detach the electrical connector from the throttle position sensor.
- Remove the mounting screws from the sensor, being careful not to round the Phillips screw head.
- Remove the sensor from the throttle body.
- Install the throttle position sensor onto the throttle body and rotate the sensor counterclockwise on the throttle shaft and temporarily tighten the screws.
- Connect the electrical harness to the sensor.
- Tighten the retainer screws to 1.8 ft. lbs. (2.5 Nm).
- Connect the negative battery cable.
- Disconnect the TPS connector.
- Measure resistance between the TPS side connector terminals 1 and 4. Standard value: 3.5-6.5 Kohms
- Measure resistance between the TPS side connector terminals 1 and 3. With test probes in place, move the throttle valve from the idle position to the full-open position. Resistance should change smoothly in proportion to the opening angle of the throttle valve.
- If any check above does not meet the specifications, replace the TPS.
- If all checks above meet the specifications, disconnect the sensor connector and measure at the harness side.
- Turn the ignition switch to "ON" position and measure the voltage between terminal 4 and ground. Voltage should be between 4.8 and 5.2 volts.
- Turn the ignition switch to "LOCK" (OFF) position and check for the resistance between terminal 1 and ground. Resistance should be less than 2 ohm.
- If any check above does not meet the specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.