Catera V6-3.0L VIN R (1997)
Engine Control Module: Description and Operation
Vehicle Speed Signal Circuit
The ECM receives the Vehicle Speed data from the Anti lock Brake System (ABS) on the vehicle speed signal circuit. The vehicle speed is calculated by
the ABS controller from the wheel speed sensor signals, and is sent to the ECM via the Vehicle Speed Signal circuit. If the ECM detects a problem with
this circuit, the DTC P0501 - Vehicle Speed Signal Circuit will set.