General 1G REED SWITCH INPUT

[all black 4G63]

Does anyone know if the reed switch input to the ECM has any major impact on engine management? i.e. idle, ignition timing, fuel control, poor performance, etc. ? I am contemplating if I need to wire it in or not.

I am working with a stock ECM set up attempting to wear in my motor. However, the instrument cluster, ECM, engine harness is only temporary until the motor finishes wearing in.

Thank you for the information

 

[Brandon Mau]

I am going to take a educated guess you are referring to the speed sensor input? If so no it doesn't have any effect on how your car will run.

 

[yokotabrat]

I can think of 2 things it would possibly affect:
1 - launch control. I believe ECMLink uses the speed sensor input to determine when to switch from the normal rev limiter to the launch rev limiter
2 - coasting fuel cut. This isn't a huge deal, but it could affect driveability somewhat. With no speed input it would always think the car is stopped and never go into a fuel cut mode when coasting.

Those are the only 2 I can think of off the top of my head.

 

[wrencher]

My 1ga had a broken speedo drive once, and it caused me severe idle control issues.
I dont know why never looked into it once the speedo went down drove it to the shop and fixed it.
But it was not happy during the ordeal.

 

[all black 4G63]

thank you very much for the info. i guess it will not be that bad to run my speedo cable and reed switch sense circuit if i'm going to use the IPC anyways,