A faulty TPS can absolutely prevent your car from running. The TPS tells the computer the position of the throttle, which is crucial for fuel injection and ignition timing. If the computer is receiving incorrect or no data from the TPS, it can't properly control the engine's operation. This can manifest in various ways, from rough idling and poor performance to a complete failure to start.
Therefore, a Code 43 ESC *could* be the reason your 1989 Chevy Beretta isn't running. However, it's not the only possibility. Other issues could cause a no-start condition, even if the Code 43 is present.
To diagnose properly:
1. Verify the Code: Double-check that Code 43 is indeed the code you're getting. Use a reliable OBD1 code reader (scan tool) specific to GM vehicles from that era. Simply checking indicator lights won't give you a precise code.
2. Check the TPS: Once you confirm Code 43, the most likely culprit is the TPS itself. You should have this professionally checked or replace it. A visual inspection might reveal obvious damage, but testing its voltage output using a multimeter is more accurate.
3. Consider other possibilities: Even with a faulty TPS, there might be other issues that compound the problem, such as:
* Fuel pump: Is the fuel pump working correctly?
* Fuel filter: Is the fuel filter clogged?
* Ignition system: Are the spark plugs, wires, distributor cap, and rotor in good condition?
* Battery and alternator: Do you have sufficient battery power and alternator output?
A qualified mechanic can properly diagnose the problem using diagnostic tools and procedures, ensuring that all potential causes are investigated and not just focusing on the Code 43. Simply replacing the TPS without further investigation might not solve the issue if there's another underlying problem.
