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DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
5.28
VEHICLE SPEED SENSOR ANTI-TAMPERING
VSS Anti-tampering can be used to detect
fi
xed 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
Group
Parameter
Range
Default
Access
8
Anti Tamper
0 = Disable
1 = Enable Anti Tamper Function
via ABS
2 = Enable Anti Tamper Function
via Gear Ratio
0
DDDL 7.0,
VEPS, DRS
8
Vehicle Speed Sensor
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
4
DDDL 7.0, DRS,
VEPS
8
Axle Ratio
1.00 - 20.00
5.29
DDDL 7.0, DRS,
VEPS
8
Number of Output
Shaft Teeth
0 - 250
16
DDDL 7.0,
VEPS, DRS
8
Tire Revolutions per
Distance
160 - 1599
312
DDDL 7.0,
VEPS, DRS
8
Top Gear Ratio
0.1 - 2.55
1
DDDL 7.0,
VEPS, DRS
8
Second Highest Gear
Ratio
0.1 - 2.55
2.55
DDDL 7.0, DRS,
VEPS
Table 5-90
VSS Anti-tampering Parameters
All information subject to change without notice.
(Rev. 01/07)
5-163
7SA827 0701
Copyright © 2007 DETROIT DIESEL CORPORATION