Section 06-09: Brake System, Anti-Lock
1994 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Symptom Chart

ConditionPossible SourceAction
  • Anti-Lock Warning Lamp Always On
  • Fuse(s).
  • Circuit.
  • Front brake anti-lock sensor indicator/Rear brake anti-lock sensor.
  • ABS hydraulic actuator/ anti-lock brake control module assembly.
  • Anti-Lock Warning Lamp Always Off
  • Fuse(s).
  • Circuit.
  • Anti-lock warning lamp bulb.
  • ABS control module.
  • ABS Does Not Work
  • Fuse(s).
  • Circuit.
  • Front brake anti-lock sensor indicator/Rear brake anti-lock sensor.
  • ABS hydraulic actuator/ anti-lock brake control module assembly.
 

On-board Diagnostics

Quick Test is performed with the key ON, engine off. Prior to performing the Quick Test, an inspection of the anti-lock warning lamp is required to verify that a fault has indeed been detected by the ABS control module or if the system is operating normally. When the ABS system is operating normally, the anti-lock warning lamp will illuminate for approximately three seconds when the key is turned ON or when the engine starts. If the anti-lock warning lamp stays on for more than three seconds after the engine starts or illuminates while driving, then a malfunction has occurred in the ABS system. The ABS DTCs are stored in the ABS control module. Up to three DTCs can be stored in the ABS control module, and they are kept in memory until they are erased. The ABS DTCs are retrieved by the anti-lock warning lamp. The ABS DTCs may indicate different failures. Therefore, it is recommended that the Quick Test procedure be followed to its entirety.

 

Retrieving Diagnostic Trouble Codes

Using STAR Tester II

  1. Turn ignition switch (11572) to OFF position.
  1. Locate ABS diagnostic terminal on the engine compartment power distribution panel.
  1. Connect SUPER STAR II Tester connector to the ABS diagnostic connector.


ABS Diagnostic Connector




NOTE: During the reading of DTCs, the diagnostics will be discontinued and the control module will return to normal operation if:

  1. Turn on SUPER STAR II tester and latch button down in TEST position. Make sure SUPER STAR II tester is in slow mode.
  1. Turn ignition switch to RUN (engine OFF). The DTCs will begin to flash. The control module will store a maximum of three DTCs. If any DTCs have been detected, each code will be flashed out once and only once after entering the diagnostic mode.
  1. If no DTCs are stored, a DTC 12 will be output. After all DTCs have been output, the ABS warning indicator will remain on until the ignition switch is cycled.