Code 23, Intake Air Temperature Low: Notes
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Control module supplies and monitors a voltage signal (4-6 volts) to sensor. When temperatures are low, sensor resistance is high and control module will see a high-monitored voltage signal. As temperature increases, sensor resistance decreases and voltage sensed by control module drops.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- This checks if Code 23 is a hard failure or an intermittent condition.
- This simulates conditions for a Code 25. If scan tester displays a high temperature, control module and wiring are not at fault.
- This checks for continuity of sensor signal and ground circuits.