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413
TM 9-2320-312-24-2
Troubleshooting Section
Result 2 The ET status screen and speed is stable,
Expected Result:
but incorrect.
All connectors, pins and sockets should be
Result 3 The ET status screen agrees with the
completely coupled and/or inserted and the harness
actual speed, but the ECM driven speedometer is
and wiring should be free of corrosion, abrasion
incorrect or inoperable.
or pinch points.
Result 4 The speed that is displayed on the ET
Results:
status screen is not present, unstable, or erratic.
OK Proceed to Test Step 2.
Results:
Not OK
Result 1 There is not a vehicle speed problem
Repair: Perform the following repair:
at this time. If a problem still exists, continue
troubleshooting until the condition is resolved.
Repair the connectors or wiring and/or replace
STOP.
the connectors or wiring. Ensure that all of the
Result 2 Proceed with vehicle speed calibration
seals are properly in place and ensure that the
connectors are completely coupled.
and adjustment.
Verify that the repair eliminates the problem.
Repair: Perform the following diagnostic
procedure:
STOP.
Troubleshooting, "Vehicle Speed Circuit -
Test Step 2. Determine the Type of
Calibrate"
Vehicle Speed Problem.
STOP.
A. Perform a dynamometer test on the vehicle or
Result 3 Proceed to Test Step 3.
perform a road test on the vehicle. Compare the
vehicle speed on the ET status screen against
Result 4 Proceed to Test Step 4.
the speedometer. Also, compare the vehicle
speed on the ET status screen against the actual
vehicle speed. The actual vehicle speed can
be measured on a dynamometer or the actual
vehicle speed can be measured by a stopwatch.
B. Monitor the vehicle speed status on ET while the
vehicle is parked and the engine is running.
C. Operate various electrical devices in the vehicle
while the vehicle speed is being monitored. In
order to operate the various electrical devices,
cycle the electrical devices to the ON position
and the OFF position.
D. Increase the engine rpm a few times and
decrease the engine rpm a few times.
Note: If the operation of a specific electrical
device is producing a vehicle speed problem, the
electrical device may be the source of an electrical
noise problem. An electrical noise problem is
also a possibility if increasing the engine rpm on
a stationary vehicle produces a vehicle speed
problem.
Expected Result:
Result 1 The speed that is displayed on the ET
status screen and the speed of the ECM driven
speedometer are stable and both speeds agree
with the actual speed.

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