What does a code 43 mean for a 1991 Chevy Caprice?

Answer 1

I'll give you all of them, these are the codes for 91-93 caprice 8 cyl 5.0-5.7 12= No engine speed signal 13= Open O2 sensor circuit 14= CTS circuit (high temperature) 15= CTS circuit (low temperature) 21= TPS circuit (signal voltage high) 22= TPS circuit (signal voltage low) 23= M/C solenoid circuit (signal voltage low) - CARB 23= IAT sensor circuit (low temp indicated) - TBI 24= VSS circuit 25= IAT sensor circuit (high temp indicated) - TBI 31= Canister purge solenoid circuit - CARB 32= EGR circuit - TBI 33= MAP sensor circuit (signal voltage high-low vacuum) - TBI 34= MAP sensor circuit (signal voltage low-high vacuum) - TBI 34= Pressure sensor circuit (signal voltage out of range) - CARB 41= No distributor reference pulse 42= Ignition control or EST circuit 43= ESC circuit - CARB 43= Knock sensor circuit - TBI 44= O2 sensor circuit (lean exhaust indicated) 45= O2 sensor circuit (rich exhaust indicated) 51= PROM error (faulty or incorrect PROM) 53= EGR system malfunction (California only) - CARB 54= M/C solenoid circuit (signal voltage high) - CARB 54= Fuel pump circuit (low voltage) - TBI 55= ECM error - TBI jr