800.MACTOOLS
63
Potentiometer Resistance Change Test
Red
Black
Jumper
Wires
TPS
Connector
5V Supply
Ground
Signal
Meter setup to check resistance change:
•
Set the rotary switch to resistance (Ω ) setting.
•
If “ ” is present on the display, press the “
DWL
” button until “ ” disappears.
•
Insert the black lead in the “
COM
” jack.
•
Insert the red lead in the “
” jack.
•
Press the “
REC
” button (selects the MAX.MIN.AVG function).
Disconnect the sensor connector and connect jumper wires between the connector and the sensor.
Connect:
•
Black test probe to the ground circuit.
•
Red test probe to the signal line (refer to the manufacturer’s schematic)
Rotate the TPS by moving the throttle and watch the bargraph move as the TPS turns. The resistance reading
should change as the signal arm on the TPS is moved (signal sweep).
As you rotate the TPS to change resistance, the bargraph moves smoothly if the TPS is good and moves
erratically if it is bad.
NOTE:
Do not insert the test probe tips into the TPS as they may damage the smaller type plug on the TPS
connector.
