Tip-offs that a bad ECU could be causing problems include the following symptoms:
• Check engine light remaining lit even after resetting
• Engine shutting off for no apparent reason
• Evident loss of injection pulse or fuel pump
• Erratic starting problems
What Tests Can You Run to Isolate the Problem?
To help determine if your ECU is at fault for your car problems, consider testing or replacing your DME relay or main relay, spark plugs, and TDC and RPM reference sensors. Some of these tests can be done at home, while you may want to consult your mechanic for others. Testing fuel injectors, idle control valves, power supply, and grounds is also recommended when trying to isolate an unusual problem.
How Independent European Car Shops Cope with ECU Problems
Many independent European car mechanics participate in ECU exchange programs that allow them to get a replacement ECU and then send in an ECU that is suspected of being faulty. For example, a Porsche computer exchange would allow a mechanic to ship a faulty ECU and receive a reconditioned ECU from the Porsche computer exchange in return.
ECU Repair and Exchange Services
ECU repair and exchange services aren't always easy to find. Once you find one, ask what testing procedures they use. For example, do they start with an extensive visual evaluation of the circuit board and components? Do they scan the ECU memory to see if it is working properly? A good ECU exchange should bench test ECUs in a way that emulates the specific engine of the car it came from.
Once the ECU is tested and repaired, components prone to failure should be replaced, and key components should be re-soldered before shipping to a customer. Find an ECU repair and exchange program that offers a warranty, and you can be confident that you'll be back behind the wheel, enjoying your European car as soon as possible.
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