Selecting Test Mode

Five test modes are available for diagnosing ABS/TCS. Test modes are:

• Mode F0 (Data List) Mode continuously monitors wheel speed data, brake switch status, ABS/TCS status, and other inputs and outputs. Data list cannot be read if any DTCs are set.
• Mode F1 (DTC History) Mode displays DTCs and description. Ignition cycle information is useful in determining reason vehicle is in for service. If display indicates zero ignition cycles since DTC was set, fault is currently present. Vehicle speed information can be used to duplicate fault if an intermittent fault condition caused DTC to set. Information on up to 3 history codes can be stored.
• Mode F2 (Diagnostic Trouble Codes) Mode displays ABS/TCS diagnostic trouble codes. Tech 1 will display any DTCs and brief description of DTC displayed. If no DTC is stored, Tech 1 will display NO ABS CODES. Proceed to SYMPTOM DIAGNOSIS. Tech 1 will respond to a clear DTCs command by indicating ABS CODES CLEARED or CODE CLEAR FAIL.
• 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 code.

  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 (Special Tests) Mode is used to perform following tests.
• SOLENOID VALVE PRESSURE HOLD TEST
• SOLENOID VALVE PRESSURE RELEASE TEST
• AUTO TEST
• TCS TEST
• LAMP/MESSAGE TEST
• AUTO BLEED PROCEDURE

  By selecting appropriate test and observing results, error conditions and faults can be further identified.