Scan Tool Testing and Procedures

The Scan Tool becomes part of the electronic system of the vehicle when it is plugged into the DLC.

The Scan Tool can perform the following functions:
^ Display the ABS/TCS data
^ Display and clear ABS/TCS diagnostic trouble codes
^ Control the ABS/TCS components
^ Perform extensive ABS/TCS diagnosis
^ Provide the diagnostic testing for intermittent ABS/TCS conditions

Each test mode has specific diagnosis capabilities which depend upon various keystrokes.

In general, the Scan Tool has five test modes for diagnosing the antilock brake system:
^ Data List:
In this test mode, the Scan Tool continuously monitors the following conditions:
^ Wheel speed data
^ Brake switch status
^ ABS status
^ TCS status
^ Other inputs and outputs
Items on Data List 2 cannot be read if a DTC is present.
^ DTC History:
The ABS/TCS system has no DTC history capabilities.
^ Diagnostic Trouble Codes:
In this test mode, diagnostic trouble codes stored by the EBCM/EBTCM may be displayed or cleared.
^ ABS/TCS Snapshot:
In this test mode, the Scan Tool captures ABS/TCS data at the following moments:
^ Before and after a malfunction occurrence
^ From a forced manual snapshot trigger Items in Snapshot 2 cannot be read until the DTCs are cleared from the memory.
^ ABS/TCS Tests:
In this test mode, the Scan Tool performs hydraulic modulator functional tests. These tests assist in isolating the problem during troubleshooting.
Tests cannot be performed until all of the stored DTCs have been cleared from the memory.

For more information, refer to the Chassis section of the Scan Tool Operators Manual.