The SCM (Speedometer Calibration Module) is an incredibly accurate digital speedometer recalibration controller that allows late-model electronic speedometers (those that use a pulsed signal input from a vehicle speed sensor) to be recalibrated for vehicle changes that affect the speedometer – namely changes to final drive gear ratio, wheel sizes and tire size.
With many late model vehicles, there are no simple means for recalibrating the speedometer. This is because the Powertrain Control Module (PCM) (sometimes called the Engine Control Computer) receives signals from the powertrain’s vehicle speed sensor and then sends digital or analog data to the speedometer. The only method for making speedometer corrections is to have the PCM reprogrammed with a custom speedometer recalibration.
In many cases, reprogramming is expensive, if it can even be done at all. This SRC module interrupts the electrical signal sent to the PCM and modifies the signal based on the adjustment value set by the user. This device can increase or decrease the speedometer signal from 50 to 175% in ½% increments. A setting of 100% would have the unit in ‘pass through’ and no adjustment is made. The SCM incorporates an onboard microprocessor executing proprietary computations and program algorithms to achieve this recalibration.
Installation is simple and is specific to make and model year. Regardless of the vehicle it is installed in, the SCM has four wires needing to be connected – 12 volt power, ground, signal in and signal out. Illustrations and clear explainations are given to assist with an installation-time that is typically 10 to 15 minutes.
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