FLASH CODES

FLASH CODES

In this task we created some faults on one of the sensors and then tried to find the codes using the flash codes. The ECU would log that there is a fault with the engine. The flash code test can be done only on EFI cars not on the ones with carburettors

Flash code is a fault that is stored in the ECU and when there is a fault in a specific sensor it flashes a specific number which tells us which of the sensors have a fault. You can then bring up the code by. Turning the engine off, then turn the key to ignition then off, then switch it to ignition again, then off, then bring it to ignition again; the codes will begin to flash on the check engine light. The sequence in which the light will flash is it will flash out first number to its value.

Most of the times the fault has to be corrected by replacing the sensor but sometimes it are also due to some loose wires. The ECU can only tell which sensor has a fault but cannot tell that weather the fault is in wiring or in the sensor itself and thus diagnostics could be difficult because of this.

To clear the faults you have to remove the battery negative terminal for 30 seconds as this will clear the ECU memory. Then start the engine on and if the light does not come over then the fault has been cleared successfully.