Code 43 whitch is a electronic spark control failure

code 43 is ....Electronic Spark Control (ESC) Circuit

Code 43 is electronic spark control. ESC module is not receiving a knock signal from knock sensor. Check knock sensor/wiring, check ESC (parts store can check for you). That's what the book says to do. On my personal vehicle I got a code 43 and the problem was a bad oxygen sensor.

43= electronic spark control- ESC module is not receiving a knck signal from knock sensor.
44=Lean exhaust. check wiring and connectors from oxygen sensor to the ECM.

Code 12 = Recently disconnected battery

Code 14 = Coolant sensor high resistance or shorted

Code 43 = Knock sensor or Electronic spark control circuit fault

Code 55 End read code.

Hope helps (remember rated this).

CODE 12- NO DISTRIBUTOR REFERENCE PULSES ECM. CODE 13- OXYGEN CIRCUIT. CODE 14- COOLANT SENSOR HIGH TEMP CODE 15- COOLANT SENSOR LOW TEMP. CODE 21 - THROTTLE POSITION SENSOR VOLTAGE HIGH.CODE 22 - THROTTLE POSITION SENSOR VOLTAGE LOW.CODE - 23 MIXTURE CONTROL SOLENOID.FOR CARBURETOR ENGINE. CODE 24 -VECHICLE SPEED SENSOR. CODE 32 - BARO CIRCUIT LOW.CODE 32 - FUEL INJECTED EGR VALVE VACUUM SWITCH SHORTED TO GROUND.OR EGR VALVE SOLENOID CIRCUIT OPEN. CODE 33 - MAP SENSOR.CODE 34 - VACUUM SENSOR OR MAP SENSOR.CODE 35 - IDLE SPEED CONTROL. CODE 41 - EST CIRCUIT. CODE 42 - ELECTRONIC SPARK TIMING.CODE 43 - ELECTRONIC SPARK CONTROL UNIT. CODE 44 - LEAN EXHAUST.CODE 45 - RICH EXHAUST. CODE 51 - PROM OR MEM CAL.CODE 52 - CALPAK. CODE 53 -EGR VALVE CARBURETED ENGINE THE EGR VALVE VACUUM SENSOR HAS RECEIVED IMPROPER EGR VACUUM. CODE 54 - M C SOLENOID CARBURETED ENGINE MIXTURE CONTROL SOLENOID SHORTED OR FAULTY ECM.CODE 54- FUEL INJECTED ENGINE FUEL PUMP VOLTAGE IS LOW.CODE 55 - ECM MAKE SURE PCM GROUND CONNECTIONS ARE TIGHT.IF OKAY.REPLACE THE ECM.

Should clearify by providing engine info. However, this will likely be what you need...

Code 43:
knock sensor or electronic spark control circuit fault

If I'm not mistaken, this code is Electronic Spark Control (ESC) Circuit which can mean anything in the system. There is a knock sensor near the starter that can be the problem. I have also seen a new distributor fix this code. The distributor can lose it's ground in the housing OR the shaft magnet gets too weak

ERROR CODE MALFUNCTION DESCRIPTION

12 ERROR CODE DIAGNOSTIC SYSTEM FUNCTIONING CORRECTLY

13 OXYGEN SENSOR CIRCUIT OPEN

14 COOLANT TEMPERATURE SENSOR CIRCUIT (HIGH TEMP)

15 COOLANT TEMPERATURE SENSOR CIRCUIT (LOW TEMP)

21 THROTTLE POSITION SENSOR (TPS) CIRCUIT (HIGH)

22 THROTTLE POSITION SENSOR (TPS) CIRCUIT (LOW)

23 MANIFOLD AIR TEMP (MAT) CIRCUIT (LOW TEMP)

24 VEHICLE SPEED SENSOR (VSS) CIRCUIT FAILED

25 MANIFOLD AIR TEMP (MAT) CIRCUIT (HIGH TEMP)

31 WASTEGATE SOLENOID ELECTRICAL SIGNAL FAILED

32 EXHAUST GAS RECIRCULATION (EGR) CIRCUIT

33 MASS AIR FLOW (MAF) CIRCUIT (HIGH)

34 MASS AIR FLOW (MAF) CIRCUIT (LOW / NO SIGNAL)

35 CODE NOT USED ON TURBO CARS

41 CAM SENSOR CIRCUIT FAILURE

42 C3I ELECTRONIC SPARK TIMING (EST) FAILURE

43 ELECTRONIC SPARK CONTROL (ESC) FAILURE

44 OXYGEN SENSOR CIRCUIT (LEAN EXHAUST)

45 OXYGEN SENSOR CIRCUIT ( RICH EXHAUST)

51 PROM ERROR

52 CALPAK ERROR

53 WATER INJECTION

54 CODE NOT USED ON TURBO CARS

55 ECM ERROR

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CODE 12

Code 43 has different meanings.It has to do with the knock sensor, electronic spark timing failure, left O2 sensor failure, and equate code 42a. Ithink that has to do with ignition switch failure. Good luck.

When you replaced the ESC did you disconnect the battery? If not then it is most likely that the vehicles ECM is still running in loop mode because it doesn't realize it has been changed. Clearing the codes, disconnecting the battery should do the trick.