TM 10-3930-675-20-10032 00-1AXLE BRAKE COOLING SYSTEM TROUBLESHOOTING0032 00THIS WORK PACKAGE COVERSError Code 191 - Temperature in Front Axle AboveCritical ThresholdError Code 192 - Temperature in Rear Axle Above Crit-ical ThresholdError Code 414 - Bypass Valve Short Circuit FailureINITIAL SETUPReferencesTM 10-3930-675-10ECS Steering (A34651.0200) (WP 0199 00-16)ECS Electrical Servo (A34648.0200) (WP 0199 00-5)WARNINGUse caution when checking wheel and hub for extreme heat. Failure to do so may cause serious burns.NOTERefer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that locate criti-cal components.Table 1. Error Code 191 - Temperature in Front Axle Above Critical ThresholdTroubleshooting Procedures.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 191 - Temperature in Front AxleAbove Critical Threshold1. Enter “EXTRA FUNCT. 12(13)” diagnostic menu andcheck temperature ofWHEEL END FRONT HUB.a. If menu shows 155:(1) Check temperature sen-sor 762-1 and connectorat left front wheel fordamage.a. Replace temperature sensor ifdamaged (WP 0092 00).b. Replace connector ifdamaged (WP 0111 00).(2)Disconnect ECU (790)connector 1 and checkcontinuity betweenconnector 762-1 pin 1and pin 2 and betweenconnector 762-1 pin 1and pin 2 and chassis.a. If continuity is not present,replace temperature sensor(WP 0092 00).b. If continuity is present, notifySRA to replace wire betweenconnectors 762-1, X168,X156, and ECU (790)connector 1 (WP 0111 00).
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