After you put in the ecu, do the crank relearn, everyone knows how to do that since its common knowledge, and you're good to go.
Here is how it's done:
Ensure that your battery is fully charged before attempting the relearn procedure. Do not leave any battery charger or jumper cables attached to the battery. Close the hood completely. Some applications require that the doors remain closed during the procedure.
96-99 chevy
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start).
Allow the key to return to the all position (same as if the vehicle would have started). The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
2. When the theft system telltale stops flashing (or turns oft) turn the key to the off position for 5 seconds and then attempt to start the vehicle. The vehicle should start on this cycle.
3. Once the vehicle is running, the password relearn is complete.
00 + chevy
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start). Allow the key to return to the on position. (same as if the vehicle would have started)
2. The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
3. When the theft system telltale stops flashing (or turns off) turn the key to the off position for 5 seconds and then attempt to start the vehicle.
4. Repeat steps 1 through 3 two more times for a total of 3 cycles/30 minutes.
5. On the next cycle of turning the ignition key from off to crank the vehicle should start
6. Once the vehicle is running, the password is learned and this completes the cycle.
7. Clear any DTC's with a scan tool if necessary. DTC history will be cleared after 100 ignition cycles.
Thank you for using fixya and keep me posted, be glad to help you get the car running 100% again
This didn't work. The light never goes out. I sat there for over 20 minutes, and no change. I bought a diognostic tool to hook up to the OBDII interface. It says its not receiving a list of sensor signals: C/EV/O/OH/E...but no stored faults. Could the missing signals be because the car is not running?
Check all your fuses, your ECM is not getting any power to it or one of the sensor's are not sending a signal which is causing your ecm to shut the engine down. Keep me posted, be glad to help you get your car running again soon.
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