Sistema Electronico 140H Trans

Copyrigh opyrightt 1991 1991,, 20 2013 13 Caterpil rpillar Inc. Inc. Al All Ri Rights ghts Reserved. rved.

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5H M03642 140H M OT OR GRA GR ADER DE R Ope O perr ación ación de Sistema Sistemas s Núm Númer o de publicaci publicación ón SEN SENR9167 9167-00 Fecha echa de publicaci publicación ón 1997 1997/06/06 /06/06 Fecha de actualización actuali zación 2000 2000/10/1 /10/19

I nt ntrr odu duc ction

Transmiss ission ion Elec Electronic Con Control Sys System The The transmiss ission ion Elec Electronic Con Control Module (ECM) (ECM) shifts ifts the machine ine transmiss ission ion based on transm transmissi ssion on outpu outputt spee speed (TOS (TOS)), Trans Transm missi ssion control lever positi position on and transm transmissi ssion modulation odulation (inc (i nchi hing ng ped pedal) press pressure ure swi switch tch positi position on.. The The transmiss ission ion ECM ECM pr processes info inforrmation ion fro fromthe inp input components. Depending ing on the speed and and di direction rection reque requested, sted, theECM then di directs thei theignal to the the specif cific combina binati tion on of solen solenoi oids ds for that speed and directi direction. on. I f a fault ult occurs, occurs, the the ECM EC M dire directs a sign signal al to the the Electronic Moni M onitori toring ng System (EM (E MS) group to alert the operator of a probl proble em. The T he technici technician an has two methods of dia diagnosing gnosing probl problem ems with wi th the transm transmission el electrical ctrical system: the Elec El ectroni tronic c Control Anal nalyzer Progra Program mmer (EC (ECA A P) via via the service rvice tool connector or thediag diagnos nosti tic c connector connector and fl flash codes. codes. The There is a uniqu ique transmiss ission ion configu figuration ion code that must be programmed int into the ECM with ith an ECA P, El E lectronic Te T echni chnician cian (ET (ET) or the transm transmission control control lever. ver. If I f a repl replacement is madeto the the ECM, the new new EC ECM must ust be program programmed with with this code. Without Wi thout this this codethe machine wil will not operate. rate. See"Usi "U sing ng the 8T 8T-8697 8697 Ele El ectronic Control ontrol A nalyzer yzer Prog P rogram rammer" secti section in in the the "Tes "Testing ting And A djusting djusting"" portion portion of this this modul odule.

file://C fi le://C:\SI :\SIS\T S\TM M P\sis P\sis511prt.ht rt.html

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Copyright 1991, 2013 Caterpillar Inc. All Rights Reserved.

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NOTE: The transmission solenoids are identified with letters (A through H) in this publication. The solenoids may also beidentified with numbers (1 through 8). Solenoid 1 is Solenoid A, Solenoid 2 is Solenoid B, etc. Definitions And Acronyms CAT Data Link A digital data communication link which is used to provide sharing of information between electronic controls and service tools on Caterpillar machines. CI D - Component Identifier A three-digit number that is displayed to thetechnician on the ECAP service tool diagnostic display during servicing. Thenumber indicates the systemcomponent in question. Countershaft Transmission The transmission used on most "H" series motor graders and is shifted by means of electrohydraulic valves which provide clutch control oil. ECAP - Electronic Control Analyzer Programmer The service tool used by the technician to gain access to the systemstatus and diagnostic information stored in the transmission ECM. ECM - Electronic Control Module The control is located under the cab. It processes the input information which then directs the proper electrical signals to the appropriateoutput devices for speeds, directions, and diagnostics. EMS - Electronic Monitoring System This is a dash-mounted device which alerts the operator to various machine status conditions. ET - Electronic Technician This is a personal computer version of the diagnostic software that is used in ECAP. FMI - Failure Mode Identifier A two-digit "F" code that is displayed on the ECAP service tool diagnostic display during servicing. The number indicates the failure mode of the related component. J umper A jumper is a piece of wire used to make an electrical connection during troubleshooting. Scroll Scrolling is the process of showing all available sets of diagnostic information, one set at a time. A set of diagnostic information is shown briefly and then the display automatically advances to the next set.

TOS - Tr ansmission Output Speed A transmission signal generated by a magnetic pickup on the transmission output shaft. VHP - Dual Horsepower Solenoid Transmission Solenoid L ocations

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Solenoid Locations (Viewed From The Front Of TheMachine) (1) Solenoid A. (2) Solenoid B. (3) Solenoid C. (4) Solenoid D. (5) Solenoid E. (6) Solenoid F. (7) Solenoid G. (8) Solenoid H.

NOTE: The transmission solenoids are identified with letters (A through H) in this publication. The solenoids may also beidentified with numbers (1 through 8). Solenoid 1 is Solenoid A, Solenoid 2 is Solenoid B, etc.

(1) Transmission ECM.

Electronic Control M odule (ECM)


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Electronic Control Module (ECM (1) Connector J 1. (2) Connector J 2. The ECM makes decisions based on input and memory information, then the corresponding response is made through the outputs. The inputs and outputs of the ECM are joined to the machine harness by two 40 contact connectors.

Inputs Numerous inputs inform the ECM of the status of the machine conditions. Two types of inputs exist; switch type and sensor type. Switches provide an open, grounded, or +battery signal to the switch inputs of the ECM. Sensors provide a constantly changing signal to thesensor inputs of the ECM. The inputs are listed on the Contact Description Chart.

Outputs The ECM responds to decisions by sending electrical signals through the various outputs. The outputs either create an action or provide information. The outputs are listed on the Contact Description Chart.

CA T Data Link Operation The CAT Data Link provides status information to other machine systems including All Wheel Drive Control and the ECAP service tool. The following parameters are available:

· Transmission Gear · Shift Lever Position


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· Transmission RPM (TOS) · Battery Voltage · Backup AlarmStatus · Transmission Modulator Supply Pressure Status · Dual Horsepower Status · SystemDiagnostic Codes · Abusive Conditions · Coasting In Neutral · In Park With Machine Moving Transmission ECM Connector Pin Assignments


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Transmission Gear Solenoids

Transmission Diagnostic Code Conversion


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Sistema Electronico 140H Trans

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