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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 then, where appropriate, follow the step by step procedure in the table
  3. Please ensure all necessary Health and Safety precautions are implemented before commencing any repair work

Wabco C3 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

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

ABS indicator lamp begins Blink Code cycle.

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

Start Pulse, Pause (2.5 seconds) then...

First Digit: 1, 2 or 4 flashes, Pause (2.5 seconds)...

Second Digit: 1 - 13 flashes, Pause (2.5 seconds)...

Third Digit: 1 - 15 flashes, Pause (2.5 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

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