Detroit Diesel DDEC VI Application And Installation page 375

5.28 VEHICLE SPEED SENSOR ANTI-TAMPERING
VSS Anti-tampering can be used to detect fixed frequency oscillators or devices which track
engine RPM and produce fewer pulses per revolution than a VSS wheel. These devices are used
to trick the CPC into believing that vehicle speed is low.
A VSS fault will be logged if the sensor appears to be working improperly but the vehicle speed is
not zero. The engine speed in all gears will be limited for the duration of the ignition cycle to the
engine speed at the Vehicle Speed Limit in top gear.
This feature should only be enabled on installations with manual transmissions where a Vehicle
Speed Sensor is wired directly to the CPC.
NOTE:
Do Not use VSS anti-tampering with SAE J1939, automatic, semi-automatic, or torque
converter transmissions.
5.28.1 PROGRAMMING FLEXIBILITY
Vehicle Speed Limiting must also be enabled. The parameters are listed in Table 5-90.
Parameter
Parameter
Group
8 Anti Tamper
8
Vehicle Speed Sensor
8 Axle Ratio
Number of Output
8
Shaft Teeth
Tire Revolutions per
8
Distance
8 Top Gear Ratio
Second Highest Gear
8
Ratio
Table 5-90 VSS Anti-tampering Parameters
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION
DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
Range
0 = Disable
1 = Enable Anti Tamper Function
via ABS
2 = Enable Anti Tamper Function
via Gear Ratio
0 = No Sensor
1 = C3 Sensor
2 = Square Wave (Hall Sensor)
3 = J1939 (ETC1)
4 = Magnetic Pickup
5 = J1939 (TCO1)
6 = J1939 (CCVS) Source 1
87 = J1939 (CCVS) Source 2
8 = J1939 (CCVS) Source 3
1.00 - 20.00
0 - 250
160 - 1599
0.1 - 2.55
0.1 - 2.55
Default Access
DDDL 7.0,
0
VEPS, DRS
DDDL 7.0, DRS,
4
VEPS
DDDL 7.0, DRS,
5.29
VEPS
DDDL 7.0,
16
VEPS, DRS
DDDL 7.0,
312
VEPS, DRS
DDDL 7.0,
1
VEPS, DRS
DDDL 7.0, DRS,
2.55
VEPS
5-163