Used PCM computer installed mileage wrong now?

The car you got the computer from must have had 190,000 miles on it. Thats why it changed to that problem is once it changed to that you cant turn it back to 60,000 miles. What your going to have to do is prove some how that you only had 60,000 something miles on the car thru smog tests service work on the car stuff like that. You will also have to replace your body control module and then they can change the mileage at that tiime. Once a mileage is programed into the body control module thru the dealers service stall when the module is new it cannot be changed thru the service stall agian unless you replace it with a new one. Prevents dishonest people turning back the mileage of a car. The module is 311.65 plus tax and also 1 hour labor times 80-100 per hour depending on shop rate. Unless you can find a new one online that has never been programed. Let me know what you find.

Once the locks are free you simply pull the connectors out. Here is how the PCM is replaced in the instructions below with diagrams showing the PCM location and replacement procedure.

The ECM has a learning ability that allows it to adjust the fuel control system to compensate for a rich or lean engine running condition. The ECM uses long term fuel trim cells, which are averages of the short term fuel trim cells. The short term fuel trim cells continuously adjust the amount of fuel the engine needs based on signals from the pre-catalyst oxygen sensors. If DTCs are cleared, the battery is disconnected, or if the ECM is replaced, the ECM long term fuel trim cells are reset to 0% and the ECM will adjust for variations in the fuel once the pre-catalyst oxygen sensors are functioning. If the engine was running rich or lean before the long term fuel trim cells were cleared, a notice in driveability may result until the ECM updates the long term fuel trim cells. The vehicle should be brought up to normal operating temperature of 80°C (176°F) to allow the ECM to adjust for any rich/lean engine running condition.

The ECM also has the ability to learn the throttle body, which allows it to learn the 0% and rest (7%) TP sensor position values as well as ensure both return spring rates within the throttle body are within acceptable limits. The ECM will automatically relearn the throttle body if the ignition is turned On for longer than 29 seconds with the ECT and IAT above a certain range (see Minimum Throttle Position Not Learned DTC). The ECM will automatically relearn the throttle body upon key-up if the battery is disconnected or the ECM has been replaced or reprogrammed. The throttle body should always be relearned if a new throttle body or ECM has been replaced. To relearn, key-up for 1 minute with the ignition On, engine Off while keeping foot Off accelerator pedal.

The ECM also has the ability to learn the crankshaft notch variation used to correctly detect engine misfires. The ECM continuously and automatically under all speed and load ranges learns the notch variation. It is important to reset the CKP notch variation adaptives using the Scan tool ONLY when a crankshaft is replaced. If the ECM is replaced or reprogrammed, the adaptives will be reset and the threshold to set misfires will be relaxed.

Check out the diagrams (Below). Please let us know what you find.

Before you go changing the ecm did the guy even test the o2 circuit to find out it was a bad ecm?Or did he just say it needed one since you brought it back for the same code?

A ecu is short for engine control unit a ecm is short for engine control module they both are the same just different name's for them.I need the exact code number's you have then I can tell you more about what's going on.

As far as the po300 p0304 and the p0306 I would say that would be more likely some bad spark plug's or a coil. The P0152 could be a bad ecm but you have to make sure the trouble tree was followed to make sure that he didn't just throw in a o2 sensor and since that didn't fix it then he just say's you need a new ecm. Ask him to tell you step by step how he figured out it need a ecm. Then let me know what he said and we will go from there.

Heres what I need you to do have the battery charged and tested. Then when you have that done start the engine let it idle and check the voltage at the battery cables at idle. Let me know what the voltage is. Sounds like a charging issue from what you described. Also what size engine do you have?

That clicking you decribed is usually because of low battery voltage. WHat happens when you turn the key to start it?Also if you check the voltage while trying to start it what does the voltage read?

I hate to say it but it really sound's like there just throwing part's at the car. They replace o2 sensor's and spark plug's to fix the problem and two day's later the same code's some up and now they want to guess a ecm or the ecm was the problem all along?They need to fix the problem for free at this point after charging you to fix the problem they never fixed to begin with. Let me ask you a question what state do you live in?

Where did the clunk low rumble come from?Also we dont know if the battery is fully charged so that could be another issue there. Try starting it again and turn on the headlights see if it dies then.