Selecting Test Mode

Six test modes are available for diagnosing ABS/VES. Test modes are:

• Mode F0 (Data List) Mode continuously monitors wheel speed data, brake switch status, ABS/VES status, and other inputs and outputs. Data list can not be read if any DTCs are set.
• Mode F1 (DTC History) Mode displays DTC history data. Fault occurrence information is stored for first 5 DTCs stored and very last DTC stored. Fault occurrence information stored consists of DTC number, number of failure occurrences and number of ignition cycles since fault first and last occurred.
• Mode F2 (Diagnostic Trouble Codes) Mode displays ABS/VES DTCs. Both ignition cycle and history may be displayed or cleared.
• Mode F3 (Snapshot) Mode will help isolate intermittent problems by capturing data before and after fault condition. Snapshots cannot be read until all stored DTCs are cleared.
• If MANUAL TRIGGER is selected, Tech 1 will wait for ENTER to be pressed before storing data. Tech 1 stores data from 8 seconds before trigger and 8 seconds after trigger is activated. All stored information can be displayed and examined for conditions which might indicate a problem, but may not set a DTC.
• If AUTOMATIC TRIGGER is selected, Tech 1 will capture data which deviates from normal conditions but may not set a DTC, such as driving over bumpy roads or railroad tracks. Condition may be caused by loose connections or intermittent wiring problems causing signal to drop out momentarily. While Tech 1 is waiting for a trigger, ENTER or F9 key may be used to force a trigger.
• Mode F4 (Misc Tests) In this mode, Tech 1 performs various ABS/VES functional tests to help isolate problems during trouble shooting.
• Mode F5 (Motor Rehome) In this mode, EBCM is commanded to return all ABS modulator/motor pack assembly motors to home position (full open). This mode should always be used before bleeding brakes.