4-46. THROTTLE POSITION (TP) SENSOR MAINTENANCE
This task covers:
General mechanics tool kit:
automotive (Appendix B, Item 1)
Multimeter (Appendix B, Item 155)
Jumper wire (Appendix B, Item 79)
Valve gauge block (Appendix B, Item 45)
Air horn removed (para. 3-14).
The TP sensor is an electrical component and must not be soaked
in any liquid cleaner or solvent, or damage may result.
Disconnect engine wiring harness connector (3) from TP sensor connector (4).
Remove two screws (71, washers (61, and TP sensor (5) from fuel injection pump (1).
Ensure throttle is closed, and place TP sensor (5) on throttle shaft (2) of fuel injection pump (1).
Rotate TP sensor (5) counterclockwise to align screw holes in sensor (5) with holes in injection
Install TP sensor (5) on injection pump (1) with two washers (6) and screws (7). Do not tighten
Adjust TP sensor (5).
Disconnect engine harness (12) and body harness connectors (11).
Install jumper wires between TP sensor connector (4) and body wiring harness connector (11).
Rotate ignition switch to RUN position (TM 9-2320-387-10).
Using a digital multimeter, measure voltage between terminals A and C of TP sensor
connector (4). Tbis voltage should be between 4.5 - 5.8 volts. Multiply by 0.33 to obtain the desired
TP sensor voltage, and use this figure to adjust TP sensor.
For example, 5.00 volts x 0.33 = 1.65 volts W.% or 0.02 volts
Install -646 side of valve gauge block between injection pump throttle lever stopscrew (8) and
housing boss (9) on the injection pump (1).
Rotate injection pump throttle lever (10) so that stopscrew (8) holds valve gauge block against
housing boss (9).