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Hi, I’m pretty new to the vtec scene, and my Teggy is on the older side of all other teggys, and apparently some corrosion occurred with the ECU, and had to be swapped out. Now I feel like the vtec isn’t noticeable, or not even working? Can someone help me with this?
 

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You need to test the output of the ECU that connects to the VTEC solenoid to verify that the ECU is outputting the signal.

In order for the ECU to initiate the VTEC system, 5 engine conditions must be met:

1. Temperature: The engine must have reached normal operating temperature.
2. Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC.
3. Vehicle Speed: The car must be in motion (wheels spinning).
4. RPM: Engine must spin to it's target value. The GS-R will send it's "GO" signal for VTEC at 4400 RPM while the Type R sends it's signal at 5700 RPM.
5. Oil Pressure: The engine must be operating with normal and safe levels of oil pressure determined by the VTEC pressure switch.
 
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