The throttle position sensor (TPS) is installed opposite the throttle valve control lever and is designed to determine the opening angle of the throttle and transmit information to the electronic engine control unit. The automatic transmission ECM also uses the output from this sensor.
Necessary
Multimeter (voltmeter and ohmmeter)
Instructions
Step 1
Remember that the throttle sensor leads differ greatly depending on the vehicle brand and the installed engine. They are connected to the engine control unit, and if there is an automatic box, also to the box control unit. Contacts Vc and E2 - positive and negative wires of the sensor power supply. The IDL contact transmits a signal to start the throttle valve. The VTA contact transmits a signal about its opening degree.
Step 2
To adjust the IDL contact on most vehicles, it is enough to set the original contact position. To do this, adjust the gap between the throttle valve and its stop screw. Find out the size of the gap in the repair manual for your car.
Step 3
Connect a voltmeter to the VTA terminal. When you press and release the gas pedal, the voltmeter readings should change synchronously with the increase and decrease in pressure on the gas pedal. If this does not happen, or the voltage changes with surges or dips, replace the sensor.
Step 4
The voltage at the VTA pin should be 0.42-0.48 V with the ignition on. Find out the specific value in the repair instructions. To adjust the voltage, loosen the 2 screws on the side of the sensor without tightening them all the way. With the ignition on, lightly tap the sensor in the direction of rotation with a screwdriver until the desired voltmeter reading is achieved.
Step 5
Tighten the screws. Check for correct voltmeter reading after several sudden throttle openings and closings. On cars with an automatic transmission, start slowly opening the throttle. When the voltmeter reads 0, 55-0, 6 V, a quiet buzzer of the box solenoid should be heard. Otherwise, look for a fault in the connection to the transmission control unit.
Step 6
Connect an ohmmeter across the VTA and IDL terminals. Loosen the sensor mounting bolts. Rotate it 30 degrees to the right and then slowly turn it back until the ohmmeter shows current flowing. Insert a 0.7 mm feeler gauge between the throttle stop screw and the stop arm. The current should stop flowing. If not, repeat the adjustment. Tighten the mounting bolts with a torque of 2 Nm, not allowing the sensor itself to move.
