Throttle Position Sensor
NOTE:
Throttle Position (TP) sensor is non-adjustable. Use following procedure to check TP sensor calibration. For complete testing of TP sensor and wiring circuit, refer to the appropriate TESTS W/CODES
article.
- Throttle Position (TP) sensor also contains a closed throttle position switch. Ensure ignition is off. Disconnect electrical connector from TP sensor, mounted on throttle body. Connect Digital Volt-Ohmmeter (DVOM) between terminals No. 3 and 4 on TP sensor. See Fig 1 .
- Insert .018" (.45 mm) feeler gauge between fixed Speed Adjustment Screw (SAS) and throttle lever. See Figure . Loosen TP sensor retaining bolts. Rotate TP sensor fully counterclockwise. Continuity should now exist between TP sensor terminals No. 3 and 4.
- Slowly rotate TP sensor clockwise until continuity between TP sensor terminals No. 3 and 4 changes to no continuity. Tighten TP sensor retaining bolts. Connect Test Harness (MB9911348) between TP sensor and TP sensor electrical connector.
- Connect DVOM to test harness connector terminals No. 2 and 4. See Fig 2 . Terminal No. 2 is the TP sensor output and terminal No. 4 is the TP sensor ground. Turn ignition on. DO NOT start engine. Note TP sensor output voltage reading on DVOM.
- The TP sensor output voltage should be .4-1.0 volt. If TP sensor output voltage is not within specification, check TP sensor wiring harness and TP sensor. See the TESTS W/CODES article for testing of TP sensor and wiring harness. Turn ignition off. Remove feeler gauge and test harness. Reinstall electrical connectors.