HOUSING AS 1902811 - Caterpillar

Illustration 1 g03281417
(A) CAT Data Link (B) CAN Data Link (C) Input components (D) Output components (1) Transmission ECM (2) Requested gear command (3) Engine speed sensor (4) Transmission input speed sensor (5) Transmission intermediate speed sensor (APECS only) (6) Transmission output speed sensor (1) (7) Transmission output speed sensor (2) (8) Torque converter charging filter bypass switch (9) Torque converter screen bypass switch (10) Transmission charging filter bypass switch (11) Liquid level sensor torque converter sump (12) ECM location 0 (Ground) (13) ECM location 1 (Ground) (14) ECM Location 2 (Open) (15) ECM Enable (Ground) (16) Transmission control inlet temperature sensor (17) Torque converter outlet oil temperature sensor (18) Key start switch (19) Solenoid proportional return feedback (1, 6, and Torque Converter) (20) Solenoid proportional return feedback (2 and 4) (21) Solenoid proportional return feedback (3 and 5) (22) Machine operation state (23) Modulating valve solenoid (1) (24) Modulating valve solenoid (2) (25) Modulating valve solenoid (3) (26) Modulating valve solenoid (4) (27) Modulating valve solenoid (5) (28) Modulating valve solenoid (6) (29) Torque converter lockup clutch solenoid
Illustration 2 g01929798
Location of the Power Train Electronic Control ModuleThe Power Train Electronic Control Module (Power Train ECM) is the main component in the power train electrical system. The Power Train ECM is located at the front of the cab. The Power Train ECM has several input signals and output signals. Refer to Illustration 1 for the input signals and the output signals.The Power Train ECM receives current through a fuse on the fuse block. This current is used to activate the modulating valve (torque converter lockup clutch), and the modulating valve (transmission hydraulic control). These modulating valves control the option of torque converter drive or the option of direct drive. These modulating valves also control the direction and the speed. The Power Train ECM also controls the electrical system for the hoist.The Cat Data Link is used to share information with other systems such as the Brake Electronic Control Module (Brake ECM), the Engine Electronic Control Module (Engine ECM), and the Advisor panel. Signals that are sent to the Engine ECM result in reduced engine speed during upshifts and increased engine speed during downshifts.The Brake ECM controls the following items:
Traction Control System (TCS)
Auto Retarder Control
Rear axle coolingThe CAN (J1939) is used only for APECS. Software that does not include APECS, uses the Cat Data Link for the CTS requests to the engine ECM.The CAN data link is also used to communicate between the engine ECM and the Transmission ECM. This data link is used for torque and speed control of the engine during transmission shifting events.If the CAN data link is faulted, then the transmission shifting performance will change. The torque converter lockup clutch will cycle during shifts and the transmission shift feel may become harsh.The Transmission ECM controls the following items:
Transmission shifting
Engine overspeed protection
Neutral coast inhibiting
Fail in gear protection
Controlled Throttle Shift (CTS) (not used on APECS)
Shift Torque Management (STM) (APECS only)
Reverse shift inhibiting
Anti-hunt
Directional shift management
Shift counter
Top gear limit
Torque converter lockup