Service and Repair Manual October 2019Control System Fault Codes120 S® -80 XC ™ • S® -85 XC ™ • S®-80 HF • S®-85 HF Part No. 1280490GTID Component ID Name Cause Effect Solution69 ACGeneratorOutput11 ShortedtosupplyvoltageTCON detected thatC45GEN circuit isshorted to 12 V.Generator functionwill not operate.* With a voltmeter, measure Y29.Proper resistance should be between5 - 60 ohms. Replace Y29 if resistanceis outside of those values.* Verify wiring for C45GEN (GR/WH,TCON J3-2) and check for open orshort circuits.72 Lift GuardContactAlarmSwitch14 CrosscheckfailedPCON detected thatinputs from SW30(contact alarmproximity sensor)are the samevoltage.Boom Up and Extendfunctions will notoperate.* Using a voltmeter, verify that thevoltage on C248CA (OR/BK, PCONJ12-1) is always the opposite ofC247CA (OR, PCON J12-11).* Check wiring for open or shortcircuits.* Verify SW30 is receiving power andground by verifying 12 V across C31pins 1 and 3.* Replace SW30 if necessary.21 Fault73 Engine OilPressure12 SensorvaluetoohighEngine oil pressuresender is shorted to12V.Engine will notoperate.* With a voltmeter, check that C25PSR( WH/BK, TCON J6P9) is not shortedto 12V and voltage is between0.1-11.5V* Replace sender if necessary24 Too low The engine oilpressure ismeasured as toolow, potentiallydamaging theengine.Engine may notattempt to start untilsystem power cycle.Engine may be turnedoff by control systemimmediately.* Stop engine as soon as possible.* Verify the engine oil level.* Verify the engine oil pump.* Power on the machine and start theengine. At the ground controls display,view the engine oil pressure gauge forproper operation.* If engine uses an analog oil pressuresensor, verify it is sending an analogvoltage on C25PSR (WH/BK, TCONJ6-9).
