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TM 9-2320-312-24-2
Troubleshooting Section
4. Repeat the test step.
E. Turn the ignition key switch to the ON position.
5. If the problem is resolved with the test ECM,
F. Access the "AT/MT/HT XMission Interface Test"
reconnect the suspect ECM.
through the following menus:
"Diagnostics"
6. If the problem returns with the suspect ECM,
replace the ECM.
"Diagnostic Tests"
7. Verify that the repair eliminates the problem.
"Special Tests"
STOP.
Note: The "Transmission Style" must be programmed
to "AT/MT/HT Option 1", "AT/MT/HT Option 2",
i01632415
"AT/MT/HT Option 3", or "AT/MT/HT Option 4" for the
Vehicle Speed and
"AT/MT/HT XMission Interface Test" to be available.
This will allow output 7 to control the AT/MT/HT
Speedometer Circuit - Test
transmission relay.
SMCS Code: 7463-081; 7493-081
G. While the voltage test lamp is being observed,
cycle the special test on and off.
System Operation Description:
H. Stop the special test.
Use this procedure under the following situation:
Expected Result:
Use this procedure to troubleshoot the system only
under the following conditions:
The voltage test lamp behaves in the following
manner:
There is an active diagnostic code.
The voltage test lamp turns on when the test is
There is an easily repeated diagnostic code that
active.
is associated with the vehicle speed circuit.
The voltage test lamp turns off when the test is
Refer to Troubleshooting, "Vehicle Speed Circuit -
not active.
Calibrate" if the vehicle speed is being calibrated
in ppm (pulses per mile) or PPKM (pulses per
Results:
kilometer).
Yes The ECM is OK. There is a problem in the
The following background information is related
harness.
to this procedure:
Repair: Perform the following repair:
The vehicle speed circuit consists of the vehicle
speed source and associated wiring. The
Repair the engine harness or replace the engine
vehicle speed source is installed by the vehicle
harness. Verify that the repair eliminates the
OEM. Usually, a sensor reads movement of the
problem.
transmission output shaft from the teeth on a
chopper wheel. The ECM converts the signal from
STOP.
the vehicle speed source into vehicle speed for the
following functions:
No Temporarily connect a test ECM. Repeat this
test step. If the problem is resolved with the test
Cruise control
ECM, reconnect the suspect ECM. If the problem
returns with the suspect ECM, replace the ECM.
Fast idle
Repair: Perform the following repair:
Idle speed control
1. Temporarily connect a test ECM.
Progressive shift
2. Remove all jumpers and replace all connectors.
Speedometer
3. Recheck the system for active diagnostic
PTO operation
codes.

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