The DDEC IV ECM can calculate vehicle speed providing the ECM is properly programmed and interfaced with a vehicle speed signal that meets DDC requirements. The Vehicle Speed Sensor (VSS), see Figure 3-43, provides a vehicle speed signal for use in Cruise Control and Vehicle Speed Limiting. The VSS signal type can be changed with the DDR, VEPS, or DRS.
NOTE:
DDC does not approve the use of signal generator sensors.
To obtain accurate vehicle mileage, the parameters, listed in Table 3-12, must be programmed with the DDR, DDDL, VEPS, or DRS.
