What causes ECU no communication?
With error message showing “No-Communication”! In most cases, communication issues can be caused by various reasons including: ignition-key position, connector-voltage issues, incorrect communication protocol, hung ECM, missing or bad data, and OEM-updated ECM software that is unknown to the scan tool.
What happens when ECU fails?
If the ECU fails completely, it will leave the vehicle without engine management control, and will not start or run as a result. The engine may still crank, but it will not be able to start without the vital inputs from the computer.
What happens if the ECU fails?
How do you fix an ECM failure?
To be sure it is an issue with the computer and not something else, you can try replacing the cam sensor first. If it still persists, you can try wiping the ECM connectors clean. If after that the problem does not go away, it means your ECM is about to fail and needs to be replaced.
How do you troubleshoot a bad ECM?
The first thing to do is test the ECM to see if it returns any error codes indicating a failure of a specific engine system. For example, if you are experiencing misfiring, then a diagnostics test of the ECM should return an error code showing a problem with one of the cylinders.
What are symptoms of no start Toyota ECM?
Some symptoms include: crank /no start and /or MIL (Check Engine Light) on and DTC codes PO601, PO606, PO607. A revised part began being installed in vehicles after a certain VIN and the revised part also replaces the ones that croak.
What to do if your ECM is not working?
If your car seems to run fine but the Check Engine light won’t turn off, your ECM may be at fault. The only way to be sure is to visit a mechanic with the proper computer. They can analyze your vehicle’s error codes, and let you know exactly what the problem is.
Can a knock sensor cause a car ECM to fail?
There’s also a knock sensor on the engine itself. While these sensors aren’t likely to cause any catastrophic problems, failures in these areas can cause your ECM to make unnecessary adjustments that affect your car’s performance. In these cases, though, the problem is usually with the sensors, and not with the ECM.
Where can I get a Toyota ECM replaced?
These are pretty reliable…Google “used Toyota parts” and you should be able to find a salvage yard unit. You can also get repaired units for about half the cost of the dealer prices if you really need one. Well the car would stall while drivining it for one, or not start.