What is code 44 on a 1993 Chevy S-10 pickup?

A code 44 on a 1993 Chevy S-10 refers to a CMP (Crankshaft Position Sensor) circuit problem. This means the computer is not receiving the correct signal from the crankshaft position sensor. The sensor tells the computer where the crankshaft is in its rotation, crucial for ignition timing and fuel injection.

Possible causes of a code 44 include:

* Faulty Crankshaft Position Sensor: This is the most common cause. The sensor itself might be malfunctioning.

* Wiring Problems: Damaged, corroded, or loose wires in the CMP sensor circuit. This includes the sensor connector.

* Poor Connections: Loose or corroded connections at the sensor, the computer, or anywhere along the wiring harness.

* Faulty PCM (Powertrain Control Module): While less likely, a problem with the computer itself could also cause this code.

To diagnose the problem properly, you'll likely need a multimeter to check the sensor's voltage and resistance, and possibly inspect the wiring for continuity and shorts. A mechanic can also use a scan tool to get more detailed information beyond just the code 44.