TPS Adjustment and Testing Procedures
Thanks to Kirk for this write-up:
This is the Throttle Position Sensor Adjustment Procedure.
What you will need:
1. Multimeter or Ohm Meter
2. Screw Driver (Philips)
3. .65mm (.026 inch) Feeler Gauge
4. Other size feeler gauges listed below to verify tests.
Procedure:
1. Loosen the two screws holding the sensor on just enough so it can be
turned. The Adjustment is very precise so just loosen the screw enough
to turn the sensor.
2. Insert feeler gauge between the throttle stop screw and the stop lever.
3. Connect one tester probe to terminal IDL and the other to terminal
EL2. When looking at the TPS as it sits they are the two left
connectors. Since we are simply checking for resistance it does not
matter which probe end goes to which terminal.
4. Very slowly turn the sensor clockwise until the ohm meter deflects to 0 ohms (no continuity) and then retighten both screws.
5. Recheck continuity between the terminals.
a. Insert a .54mm (.021 inch) feeler gauge between stop screw and stop level. You should see continuity.
b. Insert a .70mm (.028 inch) feeler gauge between stop screw and stop level. You should see no continuity.
Remember you are making tiny adjustments so it is very diificult to set
the sensor in the correct place. You will probably need a few attempts
to get it correct. Feeler Gauges are simply little pieces of metal that
are precise thicknesses. All the ones needed are common in a set and
you can get the set at sears are most tool stores. They are also very
cheap.
Testing Procedure for eletrical specifications:
This is the procedure to make sure your TPS is fully adjusted and in working condition.
What you will need:
1. Ohm meter or multimeter
2. .016 inch and .019 inch feeler gauge
Procedure:
1. Make note of which terminal is which for future reference. When
looking at the top of the TPS we will can Terminal 1 the very left
terminal and Terminal 4 the far right terminal. Terminals 2 and 3 are
inbetween.
2. With throttle body closed: Connect ohm meter to terminal 1 and 3. Resistance will be between .34k and 6.30k ohms.
3. With .016 inch feeler gauge between stop screw and stop lever,
measure resistance between terminal 1 and 2. Resistance should read
under .5k ohms.
4. With .019 inch feeler gauge between stop screw and stop lever,
measure resistance between terminal 1 and 2. Resistance should read
under infinite aka open circuit.
5. With throttle body opened completely, connect terminal 1 and 3...resistance should read 2.4 - 11.2k ohms.
6. With throttle body opened completely, connect terminal 1 and 4...resistance should read 3.1 - 7.2k ohms.
