Code 23, Throttle Position Sensor MISADJUSTED: Notes

The Throttle Position Sensor (TPS), a variable resistor, informs the ECM of throttle opening. The TPS, connected to a 5-volt reference signal, has a high resistance value at closed throttle. At wide open throttle, TPS resistance is at its lowest and output to the ECM will be close to 5 volts. Code 23 means the ECM has seen the following: voltage is not .25-1.35 volts at ECM terminal A2 for at least 30 seconds at 550-650 RPM.

Test Number 1)  This confirms Code 23 and fault are present.

Test Number 2)  This test determines if sensor signal line is shorted to ground.

Test Number 3)  See THROTTLE POSITION SENSOR in N - REMOVE/INSTALL/OHAUL.