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4LHD/4LHDX Application Manual
Powertrain Control Solutions
REV 1.1
Discrete Frequency Inputs
Engine Speed: The engine speed is a frequency input provided by either a magnetic pickup or a conditioned signal
source. It requires a range of 300 to 7000 RPM. Signal output methods are developed with PCS and the engine supplier.
Output Speed: The output speed signal is a frequency input that is provided by a magnetic pickup or a conditioned signal
source. The magnetic pickup is a variable reluctance sensor that generates an AC sine wave induced by the 40 rotating
teeth of the target rotor. The sensor has a minimum output of 0.5 volts peak-to-peak, when loaded at 60 RPM (40 Hz) and
a maximum output of 200 volts peak-to-peak (loaded) at a speed of 7,200 RPM (4.8 kHz).
Bi-Directional Inputs
Serial Data (Diagnostics): The bi-directional data communication is used for diagnostics and service.
Figure 2.5.2-1: PCS Example TCM
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