Getting codes from ECU.
For example a faulty Mass Airflow Meter is code 12 or Red 1 flash and Green 2 flashes
|11||Crank Angle Sensor||Optical Sensor in base of distributor|
|12||Mass Airflow Meter||Large sensor in intake piping|
|13||Cylinder Head Temperature Sensor||Front of driver side cylinder head behind timing cover|
|14||Car/Vehicle Speed Sensor||On transmission|
|21||Ignition Signal||Ignition coil, Power Transistor, or Crank Angle Sensor|
|22||Fuel Pump Control||Fuel pump - tank / Fuel pump relay - passenger side behind rear interior panel|
|23||Throttle Position Sensor||Side of throttle body on driver side|
|24||Neutral Safety Switch||On transmission|
|31||AC/Load||Driver Side of intake plenum|
|32||Start Signal||No signal from key switch to ecu|
|34||Knock Sensor||Right side of block|
|41||Fuel Temperature Sensor||Side of fuel pressure regulator|
|44||Normal Operation||no codes|
Codes can be cleared by disconnecting the battery or removing power from ECU.
After the engine has been started 50 times any codes will be deleted.