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 77 of 400
TM 9-2320-283-13&P
0012
0012-13
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. Check 30-amp and 5-amp fuses on ABS ECU harness. Refer to WP 0030.
2. Check ABS warning light. Refer to WP 0032.
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. Refer to
WP 0005.
2. Refer to ABS Diagnostic Codes.
SYMPTOM
Warning light illuminated during vehicle operation.
MALFUNCTION
ABS ECU processing a system fault.
CORRECTIVE ACTION
Refer to ABS Diagnostic Codes in this work package.
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. Refer to
WP 0005.
2. Troubleshoot air leak in brake system. Refer to WP 0023.
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. Refer to TM P-2320-283-20.
3. Uncage trailer brakes. Refer to TM 9-2320-283-10.
DIAGNOSTIC TROUBLE CODE TABLES–CONTINUED
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