I just bought a 1992 Camaro 25th anniversary edition with a 305 tbi and 5 speed. I just checked the codes and it is throwing a code 23 and 24. I know what they mean but what is the best way to fix them. The code 24 is the vss and my speedo does not work. Best way to fix? How do I check the code 23? How do I check the MAT and how expensive are they to buy. Will that help the ruff idle.
Please help!!!!!!!!!!!!

Jody

 

Often one code may trigger another. If your speedo is not working, it definitely suggests the VSS is not working. Check the wiring first. If everything is fine, then replace it and then clear the codes from the ecm to see if the MAT goes away.

If you are still getting the MAT error, then do the same as the VSS; check the wires to ensure all are connected, replace it if everything is fine and clear the codes in the ecm.

It would be nice if you had a scan tool as this would show if they are giving a signal and what type. No signal usually indicates a open circuit and a high signal indicates a short. The risk without a scan tool is that you may end up replacing an otherwise good sensor and find out that it is a short that is causing the problem.

With a shop manual, you can get the signal readings that correspond to various readings so you can test them with a multi-meter. Its slower and harder, but cheaper than a scan tool. Depends how much you value your time.