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415
TM 9-2320-312-24-2
Troubleshooting Section
If the sensor is damaged, replace the damaged
Select the schematic that is similar to the circuit
sensor or send the vehicle to the OEM dealer for
that is being repaired.
repairs.
Expected Result:
Verify that any repair eliminates the problem.
RESULT 1 The vehicle speed circuit is similar to
Schematic 1, 2, or 3.
STOP.
Test Step 6. Inspect the Passive Magnetic
RESULT 2 The vehicle speed circuit is similar to
Speed Sensor for Vehicle Speed.
Schematic 4 or 5.
RESULT 3 The ECM is configured for the "J1939
A. Remove the vehicle speed sensor from the
Trans" option.
transmission and inspect the vehicle speed
sensor for steel shavings, debris, or damage.
Results:
Note: Shavings and debris on the sensor may
Result 1 Proceed to Test Step 5.
occur unless the transmission fluid is drained and
replaced according to the maintenance schedule.
Result 2 The vehicle speed circuit is similar to
Schematic 4 or 5. Proceed to Test Step 7.
B. Wipe off the sensor until the sensor is clean.
Test the sensor according to the manufacturer's
Result 3 Proceed to Test Step 9.
instructions. The sensor is OEM supplied.
Test Step 5. Measure Vehicle Speed
Note: If the gap between the vehicle speed sensor
Sensor Resistance at the Sensor.
and the chopper wheel is too small, the sensor
may be damaged. Also if the gap between the
A. Disconnect the vehicle speed sensor from the
vehicle speed sensor and the chopper wheel is too
vehicle harness.
small, the sensor may create a signal due to the
vibration of the chopper wheel. This will cause a
B. Thoroughly inspect the connector. Ensure that
vehicle speed signal when the vehicle is parked. If
the connector terminals are free of corrosion
the vehicle is parked and a vehicle speed signal is
and ensure that the connector terminals are fully
produced, back out the sensor from the wheel until
seated into the housing of the connector. Repair
the signal disappears. Use caution. backing out
the connector terminals or replace the connector
the sensor too far may cause a loss of the vehicle
terminals, as required.
speed signal. Back out the sensor no more than
one turn to one and one quarter turns.
C. Measure the resistance between the two
terminals of the sensor connector. The sensor
Expected Result:
resistance measurement should be 100 to 4500
Ohms.
The vehicle speed sensor is correctly installed and
undamaged.
D. Reverse the meter leads and measure the
resistance. Switching the probes should not
Results:
change the resistance measurement by more
OK Proceed to Test Step 7.
than 10 Ohms.
Not OK
Expected Result:
The sensor resistance that is measured is between
Repair: Perform the following repair:
100 and 4500 Ohms and the sensor resistance
that is measured is within 10 Ohms with the meter
If the sensor is damaged, replace the damaged
probes in either position.
sensor or send the vehicle to the OEM dealer for
repairs.
Results:
Verify that any repair eliminates the problem.
OK Reconnect the sensor to the vehicle
harness. Proceed to Test Step 6.
STOP.
Not OK
Repair: Perform the following repair:

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