What happens if you have a bad Powertrain Control Module?
If it is getting too much fuel, your fuel economy will decrease and your exhaust emissions will increase. In some cases, a PCM problem will cause the vehicle not to run at all. The PCM’s functions include positioning the crankshaft and controlling the ignition spark and timing.
Can a bad ECM cause a stick shift?
The ECM doesn’t control the transmission on a stick shift, so if you’re having problems with your five-speed, it’s the transmission. If you’ve done numerous repairs on the transmission and replaced your automatic transmission fluid and you’re still having problems, the ECM could be at the root of your problems.
What happens if you have a bad PCM in your car?
If your automatic transmission vehicle isn’t shifting normally, take it to a mechanic immediately. A failed PCM or TCM can cause the car to get stuck in gear, which can be a serious safety issue. It can also lead to costly transmission damage.
What are the symptoms of a bad fuse box?
1 Fuses blow frequently One of the first symptoms of a problem with the fuse box is fuses blowing frequently. 2 Loose fuses Another symptom of a bad or failing fuse box is loose fuses. 3 Burned fuses or terminals
What should I do if my PCM is not working?
The reason this is important is that low voltage can cause certain sensors to fail, depriving your PCM of the input it needs to make correct adjustments. If your battery is fully charged and there’s no visible rust, your next step will be to plug an OBD or OBD II code scanner into your vehicle and see if the PCM is producing any OBD error codes.
How does the throttle position sensor ( TPS ) work?
The fuel injection computer supplies 5 Volts and Ground to the throttle position sensor. Now, since the throttle is closed, the TPS (with power and Ground supplied) sends the PCM (Powertrain Control Module=Fuel Injection Computer) a DC voltage signal of about 0.5 to 0.8 Volt.
What should my PCM read when the engine is off?
Reconnect any loose wires if necessary. If your PCM has experienced corrosion, you’ll have to skip to step 5 to see if it’s failed. While you’re under the hood, use your multimeter to ensure that your battery has a full charge. It should read at least 12.6 volts with the engine off, or 13.7 volts with the engine running.