Speedo Input @ ECU

[franknitty69]

hello people,

i have a 1995 q45 and the idiots at best buy connected the speed input wire of my navi system to the tach. needless to say gps was saying i was moving when i was at a stoplight.

anyways i've already disconnected it, but i wish to connect it to the correct wire @ the ecu. i've been following the schematics in the fsm, but can't seem to trace the speedo input after it leaves the instrument cluster.

i know i can get speedo input @ the instrument cluster, but i'd rather not have to remove the cluster.

so does anybody know which number and/or color wire is speedo @ the ecu?

thanks

[franknitty69]

small bump

[Q45tech]

The speed sensor on transmission feeds an IC on the rear of speedometer that translates speed to 0>5volts that feeds PS, TCU, and ECU.

If your NAV needs pulses you will have to tap the line from speed sensor before Speedometer.................the tach display works the same 0>5 volts.

#53 vs #7 for voltage fully detailed in FSM.

[franknitty69]

So the speedo input and the tach recieves the same data. The reason i thought it was incorrect was because the input @ the ecu was receiving signals when the car was stationary. when i revved the engine, the pulses went up. so i determined that it was the tach stupid best buy connected to wire to.

i'll just get it from the harness at the speedometer. i was at least able to trace that from the schematics.

thanks.

[Q45tech]

They don't receive the same data, the just use the same range of voltages to drive displays and other circuits.