TM 9-2320-302-20
0013 00-20
ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED
0013 00
PRO-LINK SCREENS - CONTINUED
Table 6. Component Test Functions.
COMPONENT TESTING
WARNING
When troubleshooting and testing the ABS system, do not damage the connector terminals. Damaged termi-
nals can result in the system not functioning correctly and subsequent vehicle accidents resulting in personal
injury to personnel and damage to equipment.
1.
Voltage Check. Voltage must be between 11 and 14 volts. Ignition must be turned on for this test. Measure voltage
between pins 7 and 10, pins 8 and 11, and pins 9 and 12 on cab-mounted systems.
2.
Sensor Adjustment.
a.
Push sensor in until it contacts tooth wheel.
b.
DO NOT pry or push sensors with sharp objects. Sensor will self-adjust after wheel rotation.
c.
On steering axles, sensor is accessible on in-board side of steering knuckle.
d.
On drive axles, drum assembly may have to be pulled to gain access to sensor.
3.
Sensor Output Voltage Test. Voltage must be at least 0.200 volts AC at 30 rpm. Check sensor voltage as follows:
a.
Turn off ignition.
b.
Rotate wheel by hand at 30 rpm (2 revolutions per second).
c.
Measure voltage at the points shown in Table 7.
Table 7. Voltage Test Points.
COMPONENT TEST
FUNCTION
Vehicle voltages
Monitors two voltage signals powering the ECU.
ABS valves
Cycles valves, one at a time. You hear each valve cycle. A menu selection lets you choose
from four or six valves. This test may also be used to verify valve locations. NOTE: The treadle
may be applied to put air in chambers.
ABS lamp
Monitors commanded (on/off) states of the ATC lamp. Follow screen prompts (1 On, 2 Off)
to change the status of lamp on instrument panel.
Sensors
Monitors input to ECU from wheel. Wheels must be rotated during this test.
ECU
SENSOR
CONNECTOR
PINS
Cab-mounted
LF
RF
LR
RR
6-pin
9-pin
15-pin
15-pin
4 and 5
4 and 5
5 and 6
8 and 9
