With Manufacturer's Scan Tool

When directed to a Pinpoint Test, look carefully at the schematic. Any time a repair is made, erase the anti-lock brake control module memory and repeat the Quick Test to ensure that the repair was effective. If all phases of the Quick Test result in a pass, it is likely that the problem is non-electronic related.

ABS diagnostic trouble codes may be retrieved using the following methods:
- Identifying voltage fluctuations on an analog voltmeter.
- The Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent can be used to retrieve codes.
- Reading a digital or audible code from a Rotunda Super STAR II Tester 007-0041B using Rotunda Super MECS Adapter 007-00052 or equivalent.
- Identifying flashes of the anti-lock brake warning indicator.

The test connector available for obtaining diagnostic trouble codes is the Data Link Connector (DLC) located near the battery.

The diagnostic trouble codes may indicate different failures, and departing from the Quick Test procedure may result in code identification error. Therefore, it is recommended that the Quick Test procedure be followed in its entirety. Anti-lock brake warning indicator mode inspection and ABS diagnostic trouble code retrieval are covered in the Quick Test. Quick Check/Symptom Tests

There are two tests used to retrieve codes. They are the Key ON-Engine Running (KOER) Test and the Continuous Test. These tests are described in the following steps:

The Key ON-Engine Running Test checks the anti-lock brake control module and system circuitry by testing its integrity and processing capability, and verifies that the various sensors and actuators are connected and operating properly. Code patterns will be retrieved through the DLC, and the anti-lock brake warning indicator will indicate the type of failure. Remember to watch the analog VOM, Super STAR II, NGS Tester, and anti-lock brake warning indicator for any change which will indicate where the intermittent is located.

The Continuous Test is intended as an aid in diagnosing intermittent failures in the ABS. It is identical to the Key ON-Engine Running Test, but also allows the technician to attempt to recreate an intermittent failure by tapping, moving, and wiggling the harness and/or suspected sensor. Faults will be indicated by diagnostic trouble codes using an analog VOM, Super STAR II Tester or NGS Tester. With the knowledge of the affected circuits, a close check of the harness and associated connectors can be made.