LAMP BULB CHECK

TM 9-2320-303-24-1

ANTI-LOCK BRAKE SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED

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LAMP BULB CHECK

To make sure the ABS lamp is operating, drivers should check the lamp every time the vehicle is started. When the vehi-

cle is started, the ABS lamp should come on momentarily. If it does not come on, it could mean a burned out bulb.

DIAGNOSTICS

You can troubleshoot the system in the following ways:

Blink Code Diagnostics

Pro-Link 9000

Blink Code Diagnostics.

Before using blink code diagnostics, you should be familiar with a few basic terms. If you used previous versions of

Rockwell WABCO's blink code diagnostics, review these definitions to identify major changes.

ABS Warning Lamp: This lamp serves two purposes: it alerts drivers to an ABS fault and it is used during diag-

nostics to display the blink code.

Blink Code: A series of blinks or flashes that describe a particular ABS system fault or condition.

Blink Code Cycle: A set of two flashes with each flash separated by a one-and-one-half second pause. Blink codes

are defined in Table 2.

Blink Code Switch: A switch that activates blink code diagnostic capabilities. Switch types and locations vary,

depending on the vehicle.

Clear: The process of erasing faults from the ECU.

Diagnostics: The process of using blink codes to determine ABS system faults.

Fault: An ABS malfunction detected and stored in memory by the Rockwell WABCO ECU. System faults may be

Active or Stored.

Active Fault: A condition that currently exists in the ABS system; for example, a sensor circuit malfunction on the

left front steering axle. An active fault must be repaired before it can be cleared from memory and before you can

display additional codes.

Stored Fault: There are two types of stored faults: One type is a repaired fault that has not been cleared from the

ECU. The other type is a fault that occurred but no longer exists. For example, a loose wire that makes intermittent

contact. Because stored faults are not currently active they do not have to be repaired before they can be cleared

from memory.

System Configuration Code: A one digit code (Blink Code: 2) is displayed during the clear mode. Blink codes

for common ABS system configurations are shown in Fig 7.

0019 00-7