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 68 of 400
TM 9-2320-283-13&P
0012
0012-4
CHANGING DIAGNOSTIC MODES–CONTINUED
Active Diagnostic Trouble Code Mode
–This mode is used for retrieving diagnostic trouble codes. When in this
mode, the ECU transmits blink codes for diagnostic trouble codes. For a complete explanation, refer to How to
Use ABS Diagnostics in this work package.
With the exception of wheel speed sensor trouble codes, active diagnostic trouble modes are cleared as problems
are corrected during troubleshooting by simply turning the vehicle ignition switch off and on. Wheel speed
sensor trouble codes will clear when power is turned off and on and the ECU detects valid wheel speed from all
speed sensors.
Inactive Diagnostic Trouble Code Mode
–This mode is used for retrieving past trouble codes and comments
(such as configuration changes made to the ECU) stored in the ECU's memory. Whenever an active trouble code
is cleared the ECU automatically stores the code in its memory bank as an inactive trouble code commonly
referred to as event history. In this mode, inactive diagnostic blink codes are retrieved and reviewed by the
maintainer to aid in troubleshooting the ABS.
Clear Active Diagnostic Trouble Codes
–This mode is used to clear active diagnostic trouble codes. When
cleared, active diagnostic trouble codes are permanently stored as event history in the ECU's memory.
System Configuration Check Mode
–This mode is used to display system configuration information which tells
the maintainer the type of ABS system the ECU has been programmed to operate. This configuration
information is conveyed using the following blink code patterns:
1st No.
System Power
1
12 Volts
2
24 Volts
2nd No.
Wheel Speed Sensors
4
4 Sensors
6
6 Sensors
3rd No.
Pressure Modulator Valves
4
4 Modulators
5
5 Modulators
6
6 Modulators
4th No.
ABS Configuration
1
4S/4M or 6S/6M
2
6S/4M
3
6S/5M
5th No.
Tractor Control Configuration
2
No ATC
3
ATC Engine Control Only
4
ATC Brake Control Only
5
Full ATC (Engine and Brake Control)
6th No.
Retarder Configuration
1
No retarder
2
J1939 Retarder
3
Retarder Relay
4
J1939 Retarder, Retarder Relay
Table 1. Wheel Speed Sensors–Continued.
Back to Top
