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STEP 3: Blink code identification and system response

  1. If you already know how to read ABS Blink Codes from the ECU in question, please go straight to STEP 4: Blink code list
  2. If you are unsure how to read ABS Blink Codes from the ECU, start by familiarising yourself with the diagram below, and where appropriate, follow the step by step procedure in the tables
  3. Please ensure all necessary Health and Safety precautions are implemented before commencing any repair work

Wabco D Frame version ECU

Step

Action

System Response

Action

I

 

Turn Ignition ON

Possible responses:

ABS indicator lamp comes on momentarily then goes out, indicating System O.K.

ABS indicator lamp does not light, indicating possible wiring fault or burned-out bulb

ABS indicator lamp stays on, indicating:

1. Fault, or faults, in the system

- - - - - - - - - - - - - - - - - - - 2. Sensor fault during last operation

 
3. Faults cleared from ECU, but - - -- vehicle not driven
 
4. ECU disconnected

 

No recognizable active faults in the ABS. No action required- - - - - - - - - - - - - - -

Inspect wiring. Inspect bulb. Make necessary repairs- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 

Continue with blink code diagnostics (Go to Step II below)

Continue with blink code diagnostics (Go to Step II below)

Drive vehicle — lamp will go out when vehicle reaches 4 mph (6 km/h)

Connect ECU

II

Press and hold Blink Code Switch for one second, then release

ABS indicator lamp begins flashing two-digit blink code(s)

Determine if fault is active or stored:

Active Fault: Lamp will repeatedly display one code

Stored Fault: Lamp will display code for each stored fault then stop blinking. Faults will be displayed one time only

III

 

Count the flashes to determine the blink code

First Digit: 1 - 8 flashes, Pause (1.5 seconds)

Second Digit: 1 - 6 flashes, Pause (4 seconds)

Find definition for blink code on Blink Code List

IV

 

Turn Ignition OFF

Repair and Record faults

Active Fault

 

Stored Faults

Make the necessary repairs. Repeat Steps I, II, and III until System O.K. code (1-1) received

Record for future reference

NOTE: Last fault stored is first fault displayed

Step

Action

System Response

Action

V

 

Turn Ignition ON

Clear Faults from memory: Press and hold blink code switch for at least three seconds, then release

ABS Indicator Lamp flashes eight times

Eight flashes not received

All stored faults successfully cleared. Turn Ignition OFF

Active faults still exist, repeat Steps 1 through V

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