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Page Title:
MONITOR LIGHT COMES ON AT SPEEDS OVER 15 MPH - CONTINUED |
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 TM 9-2320-269-34-1
TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
21. MONITOR LIGHT COMES ON AT SPEEDS OVER 15 MPH - CONTINUED
Step 4.
Test sensor (1) voltage.
a.
Remove cover (2) from computer module (3) sending faulty signal
using flat-tip screwdriver.
WARNING
It is very important that the vehicle is firmly supported and balanced before you begin to maintain the front
axle. If the truck is not properly supported with trestles, it could fall and crush you.
b.
Raise axle (4) using dolly jack, support with trestles, and
loosen slack adjuster (5) using 9116-inch socket and ratchet
handle with 3/8-inch drive.
c.
Connect voltmeter set on ac scale to sensor terminals (6) as
shown, spin tire (7) for sensor (1) being tested, and check meter
reading. Disconnect meter, repeat for remaining sensor
terminals (8) and front tire. Disconnect meter. If both meter
readings were at least 0.3 volts, replace computer module (3)
d.
Remove trestles and dolly jack.
Step 5.
Test sensor wires (9) for short circuit.
a.
Take connector (10) off sensor terminals (6) for sensor (1) with
faulty signal.
b.
Connect ohmmeter to sensor terminals (6) as shown, check read-
ing, and disconnect.
c.
Connect ohmmeter to terminal (6) and frame (11), check meter
reading, and disconnect.
d.
If meter readings were lower than 4000 - 6000 ohms for step b or
10,000 ohms for step c, inspect wires (9) and repair or replace
as needed (page 2-498).
e.
If meter readings were 4000 - 6000 ohms for step b and 10,000 ohms
for step c, replace sensor (1) (TM 9-2320-269-20-2).
f.
Put connector (10) on, install cover (2) using flat-tip screwdriver,
and adjust brakes (12) and sensor (1) (TM 9-2320-269-20-2).
2-36
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