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 60 of 400
TM 9-2320-283-13&P
0010
0010-2
INDICATORS AND CONTROLS
SYMPTOM
Warning light does not illuminate with ignition on.
MALFUNCTION
No power to ABS ECU due to blown ECU harness fuses or faulty warning light.
CORRECTIVE ACTION
1. Notify Field Maintenance to check 30-amp and 5-amp fuses on ABS ECU harness.
2. Notify Field Maintenance to check ABS warning light.
SYMPTOM
Warning light does not go out with ignition on.
MALFUNCTION
ABS ECU processing a system fault.
CORRECTIVE ACTION
1. Operate engine until low air pressure warning light and buzzer go off.
2. Notify Field Maintenance to troubleshoot ABS.
SYMPTOM
Warning light illuminated during vehicle operation.
MALFUNCTION
ABS ECU processing a system fault.
CORRECTIVE ACTION
Notify Field Maintenance to troubleshoot ABS.
BRAKE SYSTEM
SYMPTOM
Parking brakes will not release.
MALFUNCTION
Air pressure is below 100 psi (7 bar) or an air leak can be heard.
CORRECTIVE ACTION
1 Operate engine until low air pressure warning light and buzzer go off.
2. Notify Field Maintenance to troubleshoot air leak in brake system.
SYMPTOM
Trailer brakes will not apply.
MALFUNCTION
Trailer brake hoses not connected to tractor, trailer couplers leaking, or trailer brakes are caged.
CORRECTIVE ACTION
1. Connect trailer air brake hoses to tractor. Refer to TM 9-2320-283-10.
2. Adjust trailer brake hose connections at couplers. If necessary, notify Field Maintenance to
correct leaking trailer brake hose couplers.
3. Uncage trailer brakes. Refer to TM 9-2320-283-10.
TROUBLESHOOTING
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