Why does my GM Truck have code 43?
Code 43 is set because of an electrical issue in the system, NOT because of a misfire. If your wiring is good, then you need a PCM more then likely, according to all-data, your truck doesn’t have an ECM becuase it’s an automatic transmission. All gas engines are equipped with a knock sensor system. A knock sensor is mounted on the engine block.
How does the knock sensor work on a GM Truck?
A 3.9K ohm resistor in the knock sensor reduces the voltage to about 2.5 volts. When knock occurs, the knock sensor produes a small AC voltage that rides on top of the 2.5 volts already applied. An AC voltage monitor in the PCM is able to read this signal as knock and incrementally retard spark.
What is the reference voltage for the knock sensor?
2.Test two determines the state of the 5 volt reference voltage applied to the knock sensor circuit. The PCM applies 5 volts to CKT 496. A 3.9K ohm resistor in the knock sensor reduces the voltage to about 2.5 volts. When knock occurs, the knock sensor produes a small AC voltage that rides on top of the 2.5 volts already applied.
What does a code 43 mean on a spark control?
Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit. ESC is used to sense spark knock (pinging) and GM Code 43 Electronic Spark Control Fault Trouble Codes› GM OBD Trouble Codes› GM Code 43 CODE 43 – Electronic Spark Control Fault
Code 43 is set because of an electrical issue in the system, NOT because of a misfire. If your wiring is good, then you need a PCM more then likely, according to all-data, your truck doesn’t have an ECM becuase it’s an automatic transmission. All gas engines are equipped with a knock sensor system. A knock sensor is mounted on the engine block.
Where is the knock sensor located on a GM Truck?
On vehicles with a manual transmission, the sensor is connected by a blue wire to the knock sensor module, which is bracket mounted on the top of the engine. The sensor, in response to engine knock, sends a signal to the module and from there to the ECM, located in the passenger compartment.
2.Test two determines the state of the 5 volt reference voltage applied to the knock sensor circuit. The PCM applies 5 volts to CKT 496. A 3.9K ohm resistor in the knock sensor reduces the voltage to about 2.5 volts. When knock occurs, the knock sensor produes a small AC voltage that rides on top of the 2.5 volts already applied.
Where is the knock sensor on a starter?
This code is for the knock sensor which is located by the starter here is the location in the diagrams below. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.