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Re: ODB code for Chevy Beretta
Low voltage at electronic spark timing circuit, or functional test failure
First thing to do is to test the knock system. If the ECM isn't seeing knock from the system then it will error on code 43. If you have a scan tool it makes it much easier to do this. You can then just look for knock counts.
On a warm engine, bring the idle up to about 1000 RPM, and rap on the passenger side of the block. The engine RPM should drop a little then come back up, and the scan tool reported knock counts should increase.
If not, then the knock system is faulty.
If the above test is OK, listen for knock the next time you take it WOT. If you can't hear any then the knock system isn't going to report it either. It may be from too high an octane fuel, too low of timing, or just a detonation resistent engine.
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Hi, the indication is that your computer is not receiving a good signal from the knock sensor. Recommend you check the connector on the sensor and the wire. Also make sure the sensor isn't loose in the block. If those look good, you may want to just replace the sensor. A new one is $30 at autozone. Without the knock sensor signal, the computer will default the ignition timing toward a less fuel efficient value. The sensor looks like the picture below and is mounted in the engine block. You may have 2 knock sensors--one on each side of the engine. Sorry, but I could not find a good picture of the location. I will keep looking for one, though.
I actually have the same issue with my '90 Beretta. I have not yet had the time to look at it but I could suggest that either your master or slave clutch cylinder is shot or your clutch linkage needs to be tuned/replaced. A Master clutch will run about $50.00 at your Autozone or Advanced Auto, and the slave is about $40.00. I'm not sure wht the linkage will run you, nor do I know the cost of repair if you decide to have a mechanic fix it for you.
code #43 is for a cylinder misfire, since there are 3 codes, this would mean there are misfires on 3 of the cylinders.
code #12 means the battery has been disconnected within the last 50 key cycles (nothing to worry about unless you didnt disconnect the battery)
code #55 is just a code to let you know it has reached the end of the list
code #72 means the catalytic converter efficiency is low.
knowing the P-code would help alot more.
there are a few ways you can start to diagnose this problem, change the spark plugs, wires, and coil pack. if it isnt this, then you can go more dramatic and change the catalytic converter because it might be clogged and therfor causing the misfire