Bonneville V6-231 3.8L (1984)
Throttle Position Sensor: Adjustments
Verify that minimum idle is at specified value.
Make all checks/adjustments with engine at operating temperature.
Carburetted Models: Remove aluminum plug covering the adjustment screw. Remove the screw and connect a digital voltmeter to black wire (-) and
either of the two other colored wires (+). If volrage is approximately 5 volts, this is the reference voltage lead. Connect DVOM to 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 two other colored wires (_). If voltage is approximately 5
volts, this is the reference voltage lead. Connect DVOM to 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.
