Verify proper electrical modulator installation. Blink Code Problem Area Action Sensor BUI Sensor YEI Sensor BU 6 Sensor YE External ABS Modulator Valve Determine sensor location. Use the chart below for specific fault information. Count number of blinks on the trailer ABS lamp. Turn the control knob back to the Auxiliary Circuit (one position to the left). Turn the control knob to the Ground Integrity Indicator (one position to the right). On the MUTT, turn the control knob to the Auxiliary Circuit. Make sure trailer is stationary and wheels are properly chocked. Please consult specific ABS manufacturer manuals for more detailed information and any discrepancies in their literature shall supersede the following directions.ģ MERITOR/WABCO BLINK CODES To access Meritor/WABCO blink codes you must select the Auxiliary Circuit to power ON/OFF/ON in one second intervals using the following directions. Note: ABS Manufacturer Access Protocols/Blink Codes are subject to change. As each manufacturer uses different access methods and each blink code has different meanings, the remainder of the ABS section will be broken down by the brand of ABS system installed on the trailer you wish to test. The number of blinks displayed on the trailer ABS lamp will correspond to a specific ABS fault. Once the correct manufacturer s specific sequence is performed, you then must assess the trailer ABS lamp. Instructions on how to access several of the most common ABS systems can be found below. Depending on the system, you will need to selectively power the Auxiliary and/or Brake Light circuit in the correct order. ACCESSING ABS BLINK/FAULT CODES The MUTT provides a quick method to trigger ABS blink codes without a tractor present. This fault code will be displayed on the trailer ABS lamp when the proper access sequence is engaged. When a fault occurs, the ECU stores the code for that fault in its memory. Most trailers with ABS will also have a dedicated ABS lamp on the driver side. Trailers equipped with ABS feature an ABS Control Unit (ECU) which detects any electrical fault in the trailer ABS. All Rights Reserved.1 ABS Flash Code (Blink Code) Instructions Innovative Products of America Incorporated Tinker Street, Woodsttock, NY 8 Local: Toll Free: Fax:Ģ ABS BLINK CODE DIAGNOSTICS The MUTT can be used to access ABS Blink Codes on trailers equipped with ABS systems. © Copyright Drakefield Limited 2007-2008. If code does not clear, it may be necessary to replace the ECUĬheck all ABS valve ground connections for diagonals 1 and 2 (open, shorted to ground or shorted to battery). Verify accuracy of blink code and clear from ECU memoryĬheck vehicle voltage, fuse, and supply to ECU (9.5-14 volts)Ĭheck vehicle voltage (9.5-14 volts for a 12-volt system, 18-30 volts for a 24-volt system) Verify blink code switch was activated longer than 16 seconds Verify 7 to 14 ohms resistance for a 12-volt system, 28-49 ohms resistance for a 24-volt system Repair or replace as neededĬheck for proper data link connection (J1922 and J1939)Ĭheck ATC Valve, valve cables, and connectors Verify minimum 0.2 volts AC output 30 RPMĬheck sensor, sensor cable, and connectorsĬheck for tyre size mismatch or tooth wheel differenceĬheck sensor, sensor cable, and connector for intermittent contactĬheck for damaged tooth wheel. Refer to service information provided by manufacturerĬheck for loose wheel bearings or excessive hub runout If you require further help or information, please contact usĬheck ABS modulator valve, valve cable, and connectorsġ2-volt system: Verify 4.0-9.0 ohms resistance (ABS modulator valve)Ģ4-volt system: Verify 11.0-21.0 ohms resistance (ABS modulator valve).A list of useful ABS Diagnostic Tools is available on this website.
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