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 TM 9-2320-303-24-1
ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED
0019 00
ABS WARNING LAMP
The ABS warning lamp works as shown in Table 1. If the ECU senses a fault during normal vehicle operation, the ABS
warning lamp will come on and stay on.
Table 1. Warning Lamp Operation.
WHAT YOU DO
WHAT HAPPENS
WHAT IT MEANS
Turn the ignition on.
The ABS lamp comes on momentarily for a bulb The system is okay.
check, then goes out.
The ABS lamp does not go out at ignition.
If the bulbs go out when the vehicle is
driven above 4 mph (6 km/h), the system
is okay.
If the lamp does not go out after 5-10
second self-test, the ECU senses a fault
in the ABS system.
ABS MODULATOR VALVES
1.
Modulator Valves control the air pressure to each affected brake during an ABS function.
2.
To make sure the ABS valves are working, listen to them as follows:
a.
Turn on the ignition.
b.
Wait for the ABS light.
NOTE
The valves will cycle in 1-2-3-4 order, then diagonally in 1-2 and 3-4 order.
c.
Listen for the valves to cycle one by one, then together diagonally. See Fig 2.
0019 00-3
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