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FIGURE 28 - Brake System Troubleshooting Chart
Troubleshooting and Fault Codes
An important feature of the Bendix
®
A-18
™
trailer ABS
system is the diagnostics that are reported via the Electronic
Control Unit. This section describes how to use error codes
to identify ABS system operating problems.
There are three ways to retrieve and display trailer ABS
fault codes:
•
ServiceRanger PC software: Displays configuration
information and fault codes on the PC monitor. Refer
to the ServiceRanger PC software information later in
this section.
Observe ABS
warning light operation
Light stays ON
Light turns OFF after
2 second lamp check
Light never ON
ABS system not reporting
faults–perform traditional
foundation brake
troubleshooting and repair
Select Eaton ABS diagnostic tool
Check for power to ABS ECU.
Check warning light and wiring
Use MPSI
ProLink tool
(standard ECU only)
Check ECU configuration
Read fault codes and descriptions
Take corrective action
Clear active and inactive fault codes
Check J1587 data link wiring
Reconfigure ECU
Recheck fault codes after clearing.
If warning light remains lit or
17-12 fault code is set,
drive vehicle to clear and turn off
warning light.
Use Service Ranger
diagnostic software
(standard ECU only)
Cycle ignition key
OFF to ON
Activate blink codes
with jumper method
Check power circuit
for ECU
Reconfigure ECU
YES
NO
Warning light
blinking when activated
with jumper method?
NO
YES
Does configuration
information agree
with available
hardware?
YES
NO
Does tester
communicate with
ECU?
Check ECU configuration
•
Automatic retrieval via a hand-held tester: Displays
fault codes on the hand-held tester’s display. Refer to
the hand-held tester information later in this section to
retrieve and display fault codes. The low-cost diagnostic
cable provided with the 2S/1M system does not
accommodate the hand held tester.
•
Manual blink code diagnostics: Flashes the codes
on the ABS indicator lamp. Refer to the blink codes in
this section.
Before the ABS system can be properly diagnosed and
repaired, the foundation brake system must be eliminated
as a possible cause of the problem. Follow the
troubleshooting chart in Figure 28 to isolate and identify
the brake problem.
