DTC 23

Circuit Description
The Throttle Position Sensor (TPS) provides a voltage signal that changes relative to the throttle blade. Signal voltage will vary from about 0.5 volt (0%) at idle to about 5 volts (100%) at wide open throttle.
Code 23 means that the ECM has seen the following:
^ Voltage not between 0.25 and 1.35 volts at ECM terminal "A2."
^ For a time in excess of 30 seconds.
^ Engine speed between 550 and 650 rpm.

Test Description
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Confirms Code 23 and that fault is present.
2. Will determine if sensor signal line is shorted to ground.
3. Refer to the procedure for adjusting the throttle position sensor.

Diagnostic Aids
^ Disregard a Code 23, if "Service Engine Soon" light goes out as soon as the throttle is returned to idle.