A used ECU would have to be programmed to your vehicle, depending on make and model it can be as simple as using a diagnostic tool to program it or a lot of times it can involve swapping the contents of the internal memory from the old ECU to the new one which isn't a job for the average garage.
How can I test my car computer?
- Compile a resource list before running diagnostics on your automobile. ...
- Locate a second set of OBD-II codes. ...
- Open the driver's side door. ...
- Connect your OBD-II scanner to its diagnostic cable. ...
- Put your key into your automobile's ignition and turn to the "On" position.
How do I test if my ECU is bad?
- Check Engine Light stays on after resetting.
- Car was jump started on reverse polarity.
- Engine turning off for no reason.
- Water Damage or Fire Damage on the ECU.
- Apparent loss of spark.
- Apparent loss of injection pulse or fuel pump.
- Intermittent starting problems.
- Overheating ECU.
Can a ECU be tested?
A mechanic will conduct an ECU test to find where the sensors are going wrong and then manually check the car to find the fault. If the Engine Control Unit is not accurate, an ECU repair will be required for the sensor or wiring.Aug 30, 2018