SITE CONTENT

ECU by Part Number

ECU by Make and Model

ECU Wiring Diagrams

ABS Diagnostic Tools

Industry Links

ABS Troubleshooting for Trucks, Trailers, and Buses

 

STEP 1: Identification of the vehicle's ECU by make and model

Anti-Lock Brake System (ABS) consists of several key components: an Electronic Control Unit (ECU), wheel speed sensors, modulator valves, and exciter rings. The ECU is the brain of the system. It receives information from the sensors and sends signals to the ABS valves. In effect the ECU controls the anti-lock brake and automatic traction control systems, as well as the diagnostic functions.

The ECU continually checks itself for proper operation. If it detects a malfunction or failure in the electrical or electronic system, it will shut down that part of the ABS affected by the problem—or the entire ABS—depending upon the system and the problem. When this happens, the ABS warning lamp lights.

Operating the search function correctly

This website offers the user two ways to identify a vehicle's ECU. The quickest, and most straightforward, is to search by ECU part number. If this is not known, or not immediately available, then, as an alternative, it is possible to search by ECU make and model. The identity tag on a vehicle's ECU is the starting point, and will provide some or all of the following information: manufacturer, model or version of ECU, ABS configuration, and part number. A typical example is shown below.

  1. The only information required at this stage is the name of the ECU manufacturer, the version, type, or model of the ECU, and whether it is fitted to a truck, trailer, or bus.
  2. Use the table below to help with the process of visually identifying the ECU.
  3. Although, desirable, it is not always necessary to know the part number of an ECU, because diagnostic procedures will generally be the same for a specific version of ECU, irrespective of how many part numbers are attributable to that version.
  4. Note that the ECU manufacturer is not the same as the vehicle manufacturer.
  5. If, having followed the above guidelines, you are still unable to identify the vehicle's ECU and require further assistance, please call Customer Services on +44 (0)1277 814060 during opening hours.

Make

Mount

ECU Model

Wabco

Cab-Mounted

C1 version ECU

C2 version ECU

C3 version ECU

C3 U version ECU

D version ECU

D Basic version ECU

E version ECU

E Basic version ECU

Wabco

Frame-Mounted

D Frame version ECU

E Frame version ECU

Wabco

Trailer

Vario C ECU

Vario C2 ECU

Vario C2+ ECU

VCS ECU

VCS II ECU

Haldex

Trailer

MGX ECU

MODAL ECU

MODULAR ECU

Knorr-Bremse

Bus & Truck

Gamma CP

Gamma 2E

Gamma 3E

Gamma I

Gamma L

Gamma LKN

Gamma M

Gamma P

Gamma SKN

KB90

KB92

CI12

EU12 (including U16)

ABS 2x

Knorr-Bremse

Trailer

KB91-A

KB3-TA

A6

A9

A15

A18 (Including KB4T)

AL4T

What industry people are saying...

 

“I recommend the SensorMaster for time saving and accurate diagnostic readings. This saves both time and money to my company and my customers.”

— J. Lane, Lane Trailer Services

 

“Overall, we have found the SensorMaster to be very useful, especially in a time saving capacity.”

— CVW Review, May 2007

 

“For ease of use, speed, and accuracy of results, you'll find the SensorMaster hard to beat as an ABS diagnostic tool”

— P. Edwards, Swedish Truck . . . . Parts

 

“A worthwhile addition to any commercial vehicle workshop, especially for the accurate diagnosis of sensor related problems.”

— M. Toghill, Knorr-Bremse

 

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