Beretta V6-173 2.8L (1989)
Throttle Position Sensor: Adjustments
Equipment Hookup
Verify that minimum idle is at specified value.
Make all checks/adjustments with engine at operating temperature.
Carbureted Models: Remove aluminum plug covering the adjustment screw. Remove the screw and connect a digital voltmeter to black wire (-) and
either of the other two colored wires (+). If voltage is approximately 5 volts, this is the reference voltage source. Connect DVOM to the other wire in this
case. Apply thread locking compound to the screw and with ignition on and engine not running (as applies), quickly adjust screw to obtain specified
voltage at indicated condition.
Fuel Injected Models: Disconnect harness connector from TPS. Using three six-inch jumper wires, reconnect harness to TPS. With ignition on and
engine not running (as applies), connect a digital voltmeter to black wire (-) and either of the other two colored wires (+). If voltage is approximately 5
volts, this is the reference voltage source. Connect DVOM to the other wire in this case. Check reading against specified value. If TPS is adjustable,
loosen the unit retaining screws and rotate the unit to reach specified value.
