Modes of Operation

DIAGNOSTIC TOOL REQUIRED:
TECH 1 Tester

NOTE: The TECH 1, when connected to the Data Link Connector (DLC), becomes part of the vehicle's electronic system.

DIAGNOSTIC FUNCTIONS
The TECH 1 can perform the following functions:
^ Display ABS data.
^ Display and clear ABS DTCs.
^ Control ABS components.
^ Perform extensive ABS diagnostics.
^ Provide diagnostic testing for intermittent ABS conditions.

FUNCTION MODES
In general, the Tech 1 hs six text modes for diagnositn the antilock brake system. Each test mode has specific diagnosis capabilities which depend upon various keystrokes. In general, five keys control sequencing:
- "YES"
- "NO"
- "EXIT"
- UP ARROW
- DOWN ARROW

Diagnostic Scan-Tool Functions Menu (Part 1 Of 3):

Diagnostic Scan-Tool Functions Menu (Part 2 Of 3):

Diagnostic Scan-Tool Functions Menu (Part 3 Of 3):

SELECTING OPERATING MODES
The "F0" through "F9" keys select operating modes, perform functions within an operating mode, or enter DTC. In general, the TECH 1 has six test modes for diagnosing the antilock brake system.

Mode F0: Data List - In this test mode, the TECH 1 continuously monitors wheel speed data, brake switch status and other inputs and outputs.

Mode F1: code History - In this test mode, DTC history data is displayed. This data includes how many drive cycles since the DTC occurred, along with other ABS information. The first five and last DTC set are included in the ABS history data.

Mode F2: Trouble Codes - In this test mode, DTCs stored by the EBCM, both current ignition cycle and history, may be displayed or cleared. When a DTC is displayed with a "C", it is an indication that the DTC is current. When a DTC is displayed with an "H", that means that it is a history DTC.

Mode F3: Snapshot - In this test mode, the TECH 1 captures ABS data before and after a fault occurrence, manual key press or system malfunction (auto trigger).

Mode F4: Misc. Tests - In this test mode, the TECH 1 performs various tests to assist in problem isolation during troubleshooting. For all ABS tests, the TECH 1 must be powered from the battery using a battery adapter cable.

Mode F5: Motor Rehome - In this mode, the TECH 1 commands the EBCM to rehome the motors and pistons in the hydraulic unit. This mode should ALWAYS be used prior to bleeding the brake system.

NOTE: For more information on TECH 1 diagnostics, refer to the ABS section of the TECH 1 Operators Manual.