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Diagnostic Trouble Code
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Display
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Solution
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ACU 237.2
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Identification System
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Vehicle identification numbers do not match between control
units.
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ACU 237.14
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Identification System
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Vehicle identification fault.
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ACU 628.12
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Programming
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Armrest control unit programming in progress.
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ACU 629.12
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Operator Controls
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Armrest control unit fault. Restart engine to attempt vehicle
recovery.
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ACU 523955.31
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Transmission Load High
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Excessive engine load in manual mode. Change IVT to Auto Mode.
Increase engine speed, reduce ground speed, or reduce load.
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ACU 523960.17
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Operator Not In Seat
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Operator out of seat. Return to seated position.
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ACU 523966.31
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Transmission Come Home active
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Come Home Mode active. Basic tractor functionality only.
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ACU 158.4
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Rear PTO system
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Armrest supply voltage low. Reduce electrical load or increase
engine RPM to attempt vehicle recovery.
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ACU 177.17
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Transmission oil temperature
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Engine speed limited due to low transmission oil temperature.
Engine speed restricted to less then 1500 RPM until oil temperature
is greater then -5C (23 F).
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ACU 237.31
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Identification System
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Vehicle identification fault.
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ACU 581.7
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Transmission System
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IVT not responding to commanded gear ratio. Return to Park to
attempt vehicle recovery.
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ACU 628.2
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Operator Controls
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Armrest control unit fault.
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ACU 629.11
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Operator Controls
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Armrest control unit fault.
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ACU 630.2
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Operator Controls
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IVT set speed storage fault.
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ACU 630.13
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Operator Controls
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Armrest control unit calibration fault.
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ACU 974.2
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Operator Controls
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Hand throttle circuit voltage fault. Engine RPM limited.
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ACU 974.3
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Operator Controls
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Hand throttle circuit voltage high. Restart engine to attempt
vehicle recovery.
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ACU 974.4
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Operator Controls
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Hand throttle circuit voltage low. Restart engine to attempt
vehicle recovery.
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ACU 1079.3
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Operator Controls
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Armrest sensor supply voltage high. Restart engine to attempt
vehicle recovery.
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ACU 1079.4
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Operator Controls
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Armrest sensor supply voltage low. Restart engine to attempt
vehicle recovery.
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ACU 1080.3
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Operator Controls
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Armrest sensor supply voltage high. Restart engine to attempt
vehicle recovery.
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ACU 1080.4
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Operator Controls
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Armrest sensor supply voltage low. Restart engine to attempt
vehicle recovery.
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ACU 2000.9
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Communication System
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Engine control unit communication fault. Restart engine to attempt
vehicle recovery.
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ACU 2003.9
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Communication System
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Transmission control unit communication fault. Restart engine
to attempt vehicle recovery.
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ACU 2020.9
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Communication System
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Suspension control unit communication fault. Restart engine
to attempt vehicle recovery.
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ACU 2049.9
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Communication System
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Cab control unit communication fault. Restart engine to attempt
vehicle recovery.
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ACU 523664.2
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Operator Controls
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Gear shift lever circuit fault. Return to Park or restart engine
to attempt vehicle recovery.
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ACU 523923.2
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Operator Controls
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SCV I control lever sensor voltage fault. Restart engine to
attempt vehicle recovery.
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ACU 523923.3
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Operator Controls
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SCV I control lever sensor circuit voltage high. Restart engine
to attempt vehicle recovery.
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ACU 523923.4
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Operator Controls
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SCV I control lever sensor circuit voltage low. Restart engine
to attempt vehicle recovery.
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ACU 523953.2
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Operator Controls
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IVT speed control lever sensor circuit fault. Restart engine
to attempt vehicle recovery.
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ACU 523953.3
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Operator Controls
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IVT speed control lever sensor circuit voltage high. Restart
engine to attempt vehicle recovery.
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ACU 523953.4
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Operator Controls
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IVT speed control lever sensor circuit voltage low. Restart
engine to attempt vehicle recovery.
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ACU 523954.7
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Operator Controls
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IVT speed control lever fault. Restart engine to attempt vehicle
recovery.
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ACU 523954.11
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Operator Controls
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Set speed adjuster fault. Restart engine to attempt vehicle
recovery.
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ACU 523958.31
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Operator Controls
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The ratio between the forward and reverse set speed is incorrect.
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ACU 523960.31
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Operator Not In Seat
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Sit down or press brake or clutch and select 'Park' before driving.
Operator out of seat. Return to seated position. Return vehicle to
Park before resuming operation.
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ACU 523961.2
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Transmission system
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Park engaged while vehicle in gear. Return to Park or restart
engine to attempt vehicle recovery.
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ACU 523961.7
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Transmission Not In Park
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Park lock not engaged. Cycle gear selector or restart engine
to attempt vehicle recovery.
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ACU 523962.31
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MFWD System
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MFWD speed circuit fault.
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ACU 523963.2
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Operator Controls
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Speed Band 1 switch circuit fault. Restart engine to attempt
vehicle recovery.
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ACU 523967.2
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Operator Controls
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Speed Band 2 switch circuit fault. Restart engine to attempt
vehicle recovery.
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ACU 523968.2
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iTEC Controls
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Switch circuit fault.
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ACU 523968.3
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iTEC Controls
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Control circuit voltage high. Restart engine to attempt vehicle
recovery.
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ACU 523968.4
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iTEC Controls
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Control circuit voltage low. Restart engine to attempt vehicle
recovery.
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ACU 524017.31
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Operator Controls
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Transmission control lever voltage fault. Restart engine to
attempt vehicle recovery.
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ACU 524018.31
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Operator Controls
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Right hand reverser position fault. Return to Park to attempt
vehicle recovery.
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ACU 524019.31
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Lever not in park
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Right hand reverser position fault. Return to Park to attempt
vehicle recovery.
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ACU 524020.31
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Lever not in park
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Place transmission lever in Park.
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ACU 524021.31
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Operator Controls
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Reverser switch fault. Restart engine to attempt vehicle recovery
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ACU 524101.2
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Operator Controls
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Front hitch control lever sensor voltage fault. Restart engine
to attempt vehicle recovery.
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ACU 524101.3
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Operator Controls
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Front hitch control lever sensor voltage high. Restart engine
to attempt vehicle recovery.
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ACU 524101.4
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Operator Controls
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Front hitch control lever sensor circuit voltage low. Restart
engine to attempt vehicle recovery.
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ACU 524102.2
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Operator Controls
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SCV V control lever sensor voltage fault. Restart engine to
attempt vehicle recovery.
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ACU 524102.3
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Operator Controls
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SCV V control lever sensor circuit voltage high. Restart engine
to attempt vehicle recovery.
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ACU 524102.4
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Operator Controls
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SCV V control lever sensor circuit voltage low. Restart engine
to attempt vehicle recovery.
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ACU 524103.2
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Operator Controls
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SCV IV control lever sensor voltage fault. Restart engine to
attempt vehicle recovery.
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ACU 524103.3
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Operator Controls
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SCV IV control lever sensor circuit voltage high. Restart engine
to attempt vehicle recovery.
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ACU 524103.4
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Operator Controls
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SCV IV control lever sensor circuit voltage low. Restart engine
to attempt vehicle recovery.
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ACU 524104.2
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Operator Controls
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SCV III control lever sensor voltage fault. Restart engine to
attempt vehicle recovery.
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ACU 524104.3
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Operator Controls
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SCV III Control Lever Voltage High. Reference Diagnostic Procedure
in Technical Manual.
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ACU 524104.4
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Operator Controls
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SCV III control lever sensor circuit voltage low. Restart engine
to attempt vehicle recovery.
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ACU 524105.2
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Operator Controls
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SCV II control lever sensor circuit fault. Restart engine to
attempt vehicle recovery.
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ACU 524105.3
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Operator Controls
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SCV II control lever sensor voltage high. Restart engine to
attempt vehicle recovery.
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ACU 524105.4
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Operator Controls
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SCV II control lever sensor voltage low. Restart engine to attempt
vehicle recovery.
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ACU 524212.2
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Operator Controls
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Rear hitch control lever sensor circuit fault. Restart engine
to attempt vehicle recovery.
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ACU 524212.3
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Operator Controls
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Rear hitch control lever sensor voltage high. Restart engine
to attempt vehicle recovery.
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ACU 524212.4
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Operator Controls
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Rear hitch control lever sensor voltage low. Restart engine
to attempt vehicle recovery.
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ACU 524222.2
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Operator Controls
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Resume switch circuit fault.
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ACU 524224.2
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Operator Controls
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Rear PTO switch circuit fault. Cycle PTO switch and restart
engine to attempt vehicle recovery.
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ACU 524254.31
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Operator Controls
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Transmission circuit fault. Restart engine to attempt vehicle
recovery.
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ACU 600006.31
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Electrical System
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Vehicle controls not operating correctly.
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