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TM 9-2320-312-24-2
Troubleshooting Section
Test Step 6. Disconnect the 6V-2197
Idle shutdown
Magnetic Transducer Before Exiting the
"Monitor/Calibrate Timing" Screen on
Operation of the air inlet heater
Cat ET
Secure idle theft deterrent
A. Disconnect the timing probe from the J400
Trip data
engine timing calibration connector.
Maintenance data
B. Install the cover for the J400 connector.
With SEP00 and newer software, there are two
C. Exit the timing calibration screen on Cat ET.
different methods that can be used to obtain the
information for the ECM to use for calculating
Note: Exiting the timing calibration screen on Cat ET
vehicle speed. The ECM can calculate vehicle
will drop the engine rpm to the programmed low idle
speed by either of the following means:
if the cruise control switches were used to maintain
engine rpm during calibration. This is normal.
The ECM monitors the signal from a vehicle
speed sensor in pulses per kilometer (mile). The
Expected Result:
vehicle speed sensor is connected to the ECM
vehicle speed input circuit (terminals 32 and 33).
The magnetic transducer was disconnected before
This is the "Vehicle Speed Calibration" option.
exiting the timing calibration screen on Cat ET.
The ECM receives a J1939 Datalink Broadcast
Results:
Message from the Transmission ECU that
indicates revolutions per kilometer (mile) of the
OK STOP.
transmission output shaft. This option is only
available with SEP00 and newer software. This is
Not OK If the magnetic transducer is still
the "Vehicle Speed Cal (J1939-Trans)" option.
installed after exiting the timing calibration screen
on Cat ET, vehicle speed diagnostic codes may
Each of these methods require a specific calibration
be generated.
number to be programmed into the ECM to calculate
vehicle speed. For the "Vehicle Speed Calibration"
Repair: If vehicle speed diagnostic codes are
option that uses the vehicle speed sensor, the
generated, the vehicle speed diagnostic codes
ECM must know the number of pulses that are
should be cleared.
produced by the vehicle speed sensor during each
kilometer (mile) of travel by the vehicle. In order
STOP.
to find the number of pulses that are produced
by the sensor, multiply the tire size by the axle
i01642395
ratio. Multiply the number that was obtained in the
previous calculation by the number of teeth on the
Vehicle Speed Circuit -
output shaft that is used by the sensor to obtain the
Calibrate
pulses. For the "Vehicle Speed Cal (J1939-Trans)"
option, the ECM must know the number of times
that the output shaft revolves per kilometer (mile) of
SMCS Code: 7493-524
travel by the vehicle. This can be calculated by one
of the following methods:
System Operation Description:
Divide the pulses per kilometer (mile) of the
The ECM uses vehicle speed information for the
sensor on the transmission output shaft by the
following features:
number of teeth on the transmission output shaft.
Cruise control
Multiply the axle ratio by the number of revolutions
per kilometer (mile) of the tire.
Fast idle control
The ECM calculates vehicle speed by converting the
Idle speed control
vehicle speed signal to kilometers per hour (km/h)
or miles per hour (mph). The conversion factor is
PTO operation
customer programmable and the conversion factor
is stored in pulses per km (PPKM) or pulses per
Vehicle speed limiting
mile (PPM).
Speedometer
Progressive shift

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