TM-9-2320-283-13-P
ANTI-LOCK BRAKE SYSTEM (ABS) M915A1
TECHNICAL MANUAL; OPERATOR AND FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
AUGUST 2012
TM-9-2320-283-13-P - Page 67 of 400
TM 9-2320-283-13&P
0012
0012-3
HOW TO USE ABS DIAGNOSTICS–CONTINUED
b. To interpret a message, the first blink code number corresponds to a specific component and its
location. The second blink code number corresponds to a symptom description and a correction
action. The following example is designed to guide the maintainer through a typical blink code
message.
1) Activate ECU blink codes. Refer to Activating Blink Codes above.
2) Count and record the numbers in the message. Refer to Reading Blink Code Messages above. For
this example, the numbers are:
3, 2 and 12, 4
3) Go to the Diagnostic Trouble Codes Index. Refer to WP 0011. The first blink code numbers in the
message are 3 and 12. Look down the 1st Blink Code Number column for number 3 and note the
table number, work package, and page number.
NOTE
There are six Troubleshooting Diagnostic Trouble Code tables:
Wheel Speed Sensors, Pressure Modulator Valves, Power Supply,
J1939 Serial Communications, ECU, and Miscellaneous.
4) Go to the work package and page determined from the Diagnostic Trouble Codes Index, and refer
to Table 1, Troubleshooting Diagnostic Trouble Codes: Wheel Speed Sensors. Look down the 1st
Blink Code column for number 3. In this example, the location is the Right Steering Axle Wheel
Sensor.
5) The second blink code numbers in the message are 2 and 4. Refer to table 1, and Look down the
2nd Blink Code column for number 2, and note the Diagnostic Trouble Code Description. In this
example, the description is Output Low at Drive-off. Refer to the corrective action information for
Output Low at Drive-off and perform the procedures given to correct the problem.
6) Repeat steps 3 through 5 above for numbers 12 and 4 in the second group of the message.
7) Clear the message Active Diagnostic Trouble Code Retrieval as described in Changing Diagnostic
Modes below.
CHANGING DIAGNOSTIC MODES
The ECU has several diagnostic modes that can be selected by the maintainer. Each of these modes contain
stored information or functions within the ECU. To select and retrieve this information or other ECU functions,
the test switch is depressed a specific number of times; the system diagnostic modes are listed and described
below.
No. of Times to
Press Test Switch
System Diagnostic Mode Entered
1
Active Diagnostic Trouble Code Retrieval
2
Inactive Diagnostic Trouble Code Retrieval
3
Clear Active Diagnostic Trouble Codes
4
System Configuration Check Mode
5
Dynamometer Test Mode
7
Reconfigure ECU Mode
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