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How do you know if your engine problems are related to your ECU?
Wiki User
∙ 14y ago
You need to pull the codes and see what they say. you'll need a troubleshooting flowchart to do the testing. There are times that the flowcharts will say to replace the ECU, but that is not always the right solution.
Pulling the codes will not always be a solution, however. If the ECU is faulty, or if the ECU has a faulty power supply (e.g. ignition relay to ECU is bad), you may not be able to communicate with the ECU at all.
Each vehicle's repair manual should have a flow chart of ECU diagnostics, outlining what connections/terminals to test for voltage and resistance. Essentially, if you have positively verified that all other electrical components are working properly, and you still have signal problems, then you can assume the ECU is bad.
Wiki User
∙ 14y ago
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