DTC 23, Throttle Position Sensor MISADJUSTED: Notes
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1993 GMC Yukon, 1993 GMC Vandura Special, 1993 GMC Vandura, 1993 GMC Suburban, and 1993 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
The Throttle Position (TP) sensor provides a voltage signal that changes relative to throttle opening. Signal voltage will vary from about 0.5 volt at idle to over 5 volts at Wide Open throttle (WOT). DTC sets when ECM senses that voltage is not between 0.25-1.35 volts at ECM terminal A15, for at least 30 seconds, and engine speed is 550-650 RPM.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This confirms DTC 23 fault is present.
- This test determines if sensor signal circuit is shorted to ground.
- Adjust throttle position sensor. See THROTTLE POSITION SENSOR in REMOVE/INSTALL/OVERHAUL article in this section.