Testing electronics requires electronic tools.  ABS operation depends upon the auxiliary circuit to deliver at least 9.5 Volts at the ECU (TMC RP 141) and a dependable brake circuit as a backup power to reactivate the ECU using the brake light circuit.  With the ABS warning light and LITE-CHECK testing equipment, the technician can quickly diagnose the ABS functions.

LITE-CHECK simplifies the process with instant information and performs the following steps:

• Is the Brake circuit operating correctly?  Does the ABS warning flash and ECU solenoids chatter verifying the brake light circuit is powering up and activating the ECU?
• Is the Aux circuit operating correctly?  Upon powering the auxiliary circuit, does the ABS warning lamp flash and ECU solenoids chatter, indicating vehicle ABS safety feature is armed? Does the ABS lamp turn off signaling no ABS faults exist?
• Is the above testing being performed with measured filtered regulated 12 VDC power assuring ECU is receiving adequate power?
• Can the ECU condition (ABS fault codes) be quickly read?

A trailer with incandescent lamps, additional connections, and marginal wire gauge will have an excessive amp load preventing sufficient operating voltage for the ABS operation. The LITE-CHECK load test defined by the TMC RP 141 will display vehicle circuit amperage load as a test of verifying adequate voltage to the ECU.

There are hidden costs due to “we’ve always done it that way”.

Brake and tire wear are a direct cost of inadequate brake testing and maintenance. With the LITE-CHECK full function remote control, the technician is able to apply and observe the brake operation at the wheel on both the trailer and truck.

The LITE-CHECK ‘INSPECTOR’ 910B is the ideal tester for fleet trailer inspection and maintenance. 
LITE-CHECK LLC of Spokane, Washington is a member of CTEA, CVSA, and TMC.

From Ontario Trucking by Bob Blair, LITE-CHECK
April 10, 2009