Why is the ECU not working on my Mercedes Benz?
He specified that he just could not make a connection to the ECU at ALL; he took the time to explain that a lot of times when cars come to his shop the machine is not able to read the readiness portion for the cars to pass smog, something that can be fixed by driving the car around for several hours, but that was not the case with my car.
Why is the OBDII port on my 1999 e320 not working?
My 1999 E320 has a dead 16 pin OBD II port under the dash – it died a couple weeks ago shortly after I had plugged my wi-fi transmitting code reader into it and was getting ready to read the codes on my Iphone when I lost signal. I assumed that the transmitter in the code scanner had failed, not the port itself.
Why is the OBDII scanner not working on my Mercedes Benz?
When I got home I took an OBDII scanner, the same one I have used several times in the past to read the codes, and the machine did not connect at all to the car, simply the OBDII scanner does not power up. When I move the key to the ignition position the CEL light comes on as it should and goes off when the engine starts.
He specified that he just could not make a connection to the ECU at ALL; he took the time to explain that a lot of times when cars come to his shop the machine is not able to read the readiness portion for the cars to pass smog, something that can be fixed by driving the car around for several hours, but that was not the case with my car.
Can a car fuse go bad for no reason?
Even a fuse dedicated solely to the car’s computer diagnostics can blow for no apparent reason. Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box. This should be covered in your owner’s manual or a proper service manual.
Do you need a fuse for the OBDII port?
But, I believe that the “C4” version of SDS (the wifi version most shops have now) has its own power supply, so it can talk to the car’s systems over OBDII without that fuse. The older C3 version of SDS (with the RS232 breakout box), like most generic OBDII scanners, does require power from the OBDII port. One more update to this thread.
Where is the fuse on a 1999 e320?
My 1999 E320 is a W210, rather than a W203 as the OP, so the fuse layout is likely different. Thanks again. It is at the passenger side under the module box lid. Remove the lid (4 bolts), find the K40 fuse / relay module.
What happens when an ECM power relay goes dead?
If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead. The ECM power relay is one of the most important relays as it provides power for the vehicle’s computer system.
What are the symptoms of a bad ECM?
1. No power when the key is inserted 2. Engine will not start 3. Battery drain or dead battery The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions.
But, I believe that the “C4” version of SDS (the wifi version most shops have now) has its own power supply, so it can talk to the car’s systems over OBDII without that fuse. The older C3 version of SDS (with the RS232 breakout box), like most generic OBDII scanners, does require power from the OBDII port. One more update to this thread.
Even a fuse dedicated solely to the car’s computer diagnostics can blow for no apparent reason. Check your fuses to see if any have gone bad. Remember that your car or truck might have more than one fuse box. This should be covered in your owner’s manual or a proper service manual.