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Section 5 WARNINGS ! To prevent serious eye injury, always wear safe eye protection when you perform vehicle maintenance or service. ! The ABS is an electrical system. When you work on the ABS, take the same precautions that you must take with any electrical system to avoid serious personal injury. As with any electrical system, the danger of electrical shock or sparks exists that can ignite flammable substances. You must always disconnect the battery ground cable before working on the electrical system There are three methods used to get fault information from the ECU: TOOLBOX Software Pro-Link 9000 Blink code diagnostics - Ignition power activation - Diagnostic tool There is also a new diagnostic tool for checking PLC, the PLC/J1708 adapter. FIgure 5.1. Important PLC Information for Blink Code Diagnostic Blink Code 17 indicates a PLC failure. If PLC does not seem to be operating properly, but there is no Blink Code 17, the ECU is functioning properly and does not need to be replaced; however, there could be a problem in the trailer's wiring harness. Check the wiring system and make the necessary repairs. If the problem persists, contact the customer service center for assistance. Meritor WABCO TOOLBOX Software is a PC-based diagnostic program. Version 4.1 (or higher) runs in Windows® 95, 98, NT, 2000, or Me and provides diagnostic capabilities by communicating with the ECU. Trailer ABS screen are described in this manual. Refer to the owner's manual for detailed operating instructions. TOOLBOX Software has the following functions.
Note: A J1587/J1708 to RS232 or PLC to J1708 interface is required to run this software. TOOLBOX Software is available from SPX (Kent Moore), 800-345-2233. Main Screen Figure 5.2 Tire Calibration Figure 5.3 Service Information Figure 5.4 Notebook Figure 5.5 Sensor Test Figure 5.6 Report Information Figure 5.7 Save and Print 1. Click on the heading Trailer and click Save. A window will appear asking for the VIN and Employee number. 2. Provide this information and close the window. 3. Go back to the heading Trailer ECU and click Print. 4. You will be asked to input the VIN and Employee number. 5. Click Print. The Meritor WABCO Enhanced Easy-Stop Trailer ABS ECU detects any electrical fault in the trailer ABS. Each of the faults has a code. When a fault occurs, the ECU stores the code for that fault in the memory. There are two kinds of faults: active and stored. Active faults are those currently existing in the system, such as a broken wire. Stored faults are faults that have occurred but do not presently exist. Active faults can be cleared only after repairs are completed. Stored faults can only be diagnosed with TOOLBOX Software or the Pro-Link® 9000. The ECU signals a malfunction by lighting both the internal and external indicator lamp when a fault exists. The external ABS indicator lamp is usually mounted on the left rear of the trailer, near the rear wheels.There are two ways to obtain blink codes: - Ignition Power Activation (recommended method) - Diagnostic Tool NOTE: In previous versions of Easy-Stop, the blink code tool and the ABS indicator lamp would flash the blink code at the same time. With Enhanced Easy-Stop, this does not happen. The codes are displayed one blink at a time, first on the trailer ABS lamp, then on the blink code tool, as illustrated in Figure 5.9. Although the ECU can store multiple faults in its memory, it only displays one blink code at a time. This is why it is important to recheck the blink codes after repairing a fault. If there are additional codes in the memory, they only blink after you have repaired the first fault. Stored faults, clear all and end line test modes are available with the TOOLBOX Software or the Pro-Link 9000. Ignition Power Activation Ignition Power Activation is the process of using the vehicle's ignition switch (or interrupting the power on the blue wire by some other means) to display blink codes on the trailer ABS indicator lamp located on the side of the trailer. This method is for constant power vehicles only. To obtain blink codes using ignition power activation, perform the following procedures: 1. Turn the ignition switch on for no longer than 5 seconds. The ABS indicator lamp will be on. 2. Turn the ignition switch off. The ABS indicator lamp will go out. 3. Turn the ignition switch on. The ABS indicator lamp will then come on, then go out. 4. The blink code will be displayed three times by the ABS indicator lamp on the trailer. NOTE: For ignition power activation, power is provided by the ignition switch.
Table C: Blink Codes
Diagnostic Tool (Blink Code Check) The red dust cap on the diagnostic tool protects the tool during shipping. The tool and the LED are independently sealed against contamination. The SAE J1587 connector must be protected from contamination when the diagnostic tool is not installed. Reinstall the gray cap when the connector is not in use. Use the following procedures to install the diagnostic tool in the SAE J1587 connector. 1. Remove the gray protective cap form the J1587 connector. - Turn the cap counterclockwise. - Pull off the cap. 2. Align the notches on the tool with the notches on the connector. 3. Insert the tool firmly in the connector. 4. Firmly turn the gray ring of the tool clockwise to secure it in place. Figure 5.10. 5. After removing the diagnostic tool, replace the gray protective cap. 6. Make sure the vehicle is stationary: - Emergency brake ON - Wheels properly chocked 7. Provide 12 volts DC power (9.5 to 14 volts is acceptable range) to the ECU/Valve Assembly. 8. Check the ABS indicator lamp on the trailer. If: - The indicator lamp comes ON briefly, then goes OFF: There is no fault in system. - The indicator lamp comes ON and stay ON: There is an existing fault. Go to Step 9. 9. Press the blink code switch once for one second and release the switch. 10. When there is an existing fault: The ABS indicator lamp will flash between three and eighteen times to identify the existing fault. 11. When there are existing faults: You must repair existing faults. 12. After you identify an existing fault, turn the power to the ECU OFF. Repair the fault. Turn the power to the ECU back ON. 13. Repeat Step 9. If there are no other existing faults in the system, the ABS indicator lamp will come ON, go OFF and remain OFF. 14. If you have just repaired a sensor gap fault, the ECU is "waiting" to see a 4-mph signal on sensed wheels. Until this 4-mph is sensed by the ECU, the ABS indicator lamp on the trailer will remain ON. MPSI Pro-Link 9000 Diagnostic Tool The MPSI Pro-Link 9000 diagnostic tool can test for existing and stored faults, read and clear fault codes, and test components, for Meritor WABCO tractor and trailer ABS. SPX (Kent-Moore) offers Kit J 38500-404 that contains the Meritor WABCO ABS Multiple Protocol Cartridge (MPC), a Meritor WABCO applications card, and the manual Meritor WABCO ABS/ATC Systems, which contains complete information and operting instructions for the MPSI Pro-Link 9000 diagnostic tool. Order the kit from SPX (Kent-Moore), 28635 Mound Road, Warren MI 48092-3499; phone 800-345-2233. NOTE: A J 38500-60A Deutsch cable is also required. It is available from SPX (Kent-Moore).
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