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| Illustration 1 | g01233254 |
Left rear side of the cab | |
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| Illustration 2 | g01206648 |
Machine Electronic Control Module (ECM) | |
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| Illustration 3 | g01144222 |
Power train Electronic Control Module (ECM) (1) Connector J1. (2) Connector J2. | |
Remove the cover in Illustration 1 in order to gain access to the machine electronic control module (ECM). The machine (ECM) is mounted under the rear of the operator's cab on the left side of the machine.
The main function of the machine ECM is the shifting of the transmission. The operator input is sent to the machine ECM by the transmission direction and speed controls on the steering wheel. The operator input indicates the desired speed for the transmission and the desired direction for the transmission. The machine ECM makes decisions that are based on the input information and on the memory information. After the machine ECM receives the input information, the information is compared to the memory information. The machine ECM sends a corresponding response via the outputs. The inputs and the outputs are connected to the machine harness via two 70-pin connectors.
The machine ECM also controls the backup alarm. The backup alarm is activated whenever the direction control switch is in the reverse position.
The machine ECM has built-in diagnostics in order to detect faults in the transmission system. The diagnostics are displayed on the display screen.
ReferenceFor additional information about the transmission electrical system, refer to the Schematic, "525C / 535C / 545C Wheel Skidder Electrical System Schematic" for the machine that is being serviced.
Inputs
The machine has several input devices. Input devices inform the machine ECM of the operating conditions of the machine. The machine has two types of inputs, switch inputs and sensor inputs. The switch inputs of the machine ECM are provided with the following signals from the switches: an open, a ground and a positive battery source. Sensors provide a constantly changing signal to the machine ECM. Tables 1 and 2 list the inputs to the machine ECM.
Outputs
The machine ECM makes decisions by sending electrical signals through the outputs. The outputs can create an action or the outputs can provide information to the machine ECM. Tables 1 and 2 list the outputs to the machine ECM.
Input/Output
The Cat Data Link is used to communicate with the other electronic control modules on the machine. The Cat Data Link is bidirectional. This allows the machine ECM to receive information and this allows the machine ECM to send information. The Cat Data Link allows the sharing of information with other electronic controls.
- The machine ECM receives the harness code input from the Monitoring System.
- The machine ECM sends the following information to the Monitoring System: engine speed, parking brake switch status, transmission speed selection, transmission direction selection, status of the grapple auto/manual switch, status of the transmission filter and diagnostic codes of the transmission.
- The Instrument Cluster displays this information for the operator or for service personnel.
| Description of Connector J1 on Machine ECM | ||
|---|---|---|
| Conn. Pin (1) | Function | Type |
| 1 | Key Switch Run | Switch Input |
| 2 | Trans Out Speed Sensor + | Frequency Input |
| 3 | Trans Out Speed Sensor − | Frequency Input |
| 10 | CAT Data Link + | Input/Output |
| 11 | +5V Sensor Return | Ground |
| 12 | Backup Alarm | Output |
| 13 | - Battery | Ground |
| 20 | CAT Data Link - | Input/Output |
| 21 | 5V Sensor Return | Ground |
| 22 | Fuel Level Sender (Passive) | Switch Input (open or ground) |
| 23 | - Battery | Ground |
| 26 | Location Code 0 | |
| 27 | Location Code 1 | |
| 28 | Location Code 3 | |
| 29 | Torque Conv Temp Sender (Passive) | Input |
| 30 | Hyd Oil Temp Sender (Passive) | Input |
| 31 | + Battery | Power |
| 32 | Location Code Enable | |
| 33 | Autograb Switch (N.O.) | Switch Input (open or ground) |
| 34 | Autograb Switch (N.C.) | Switch Input (open or ground) |
| 35 | Lockup Clutch Enable | Switch Input (open or ground) |
| 36 | Grapple Press Signal | Frequency Input |
| 38 | + Battery | Power |
| 39 | + Battery | Power |
| 40 | Upshift (N.C.) | Switch Input (open or ground) |
| 41 | Upshift (N.O.) | Switch Input (open or ground) |
| 42 | Downshift (N.C.) | Switch Input (open or ground) |
| 43 | Downshift (N.O.) | Switch Input (open or ground) |
| 44 | + 8V Sensor Power | Power |
| 45 | 8V Sensor Return | Ground |
| 46 | + Battery | Power |
| 47 | + Battery | Power |
| 48 | Speed 1 Clutch | Solenoid Output |
| 49 | Speed 2 Clutch | Solenoid Output |
| 50 | Solenoid Return | Output Return |
| 51 | FORWARD HIGH Clutch | Solenoid Output |
| 52 | Lockup Clutch | Solenoid Output |
| 53 | Ground (Extra Pin) | Ground |
| 54 | Solenoid Return | Output Return |
| 56 | 10V Return | Ground |
| 57 | - Battery | Ground |
| 58 | Deck Blade Up Solenoid. | Solenoid Output |
| 59 | Deck Blade Down Solenoid. | Solenoid Output |
| 60 | Solenoid Return | Output Return |
| 61 | Cable Winch Brake OFF | Output |
| 62 | Speed 3 Clutch | Solenoid Output |
| 63 | Differential Lock Switch (N.O.) | Switch Input (open or ground) |
| 64 | Differential Lock Switch (N.C.) | Switch Input (open or ground) |
| 65 | FORWARD LOW Clutch | Solenoid Output |
| 66 | Reverse Clutch | Solenoid Output |
| 67 | Differential Lock Solenoid | Solenoid Output |
| 68 | Parking Brake Solenoid | Solenoid Output |
| 69 | 10V Power | Power |
| 70 | - Battery | Ground |
| ( 1 ) | The pins that are not shown are not used. |
| Description of Connector J2 on Machine ECM | ||
|---|---|---|
| Conn. Pin (1) | Function | Type |
| 1 | Key Start | Switch Input (open or ground) |
| 2 | Grapple Tong Close Solenoid | Solenoid Output |
| 3 | Grapple Tong Open Solenoid | Solenoid Output |
| 4 | Grapple Return | Switch Input (open or ground) |
| 5 | Grapple Rotate CW Solenoid | Solenoid Output |
| 6 | Grapple Rotate CCW Solenoid | Solenoid Output |
| 7 | Start Relay | Output |
| 8 | Start Relay Return | Output |
| 9 | Secondary Steering Relay | Output |
| 10 | Grapple Solenoid Return Relay | Output |
| 11 | Winch Free Spool Relay | Output |
| 12 | Winch Reel IN Relay | Output |
| 13 | Winch Reel OUT Relay | Output |
| 14 | Alternator R Terminal | Output |
| 19 | Winch Solenoid RETURN Relay | Output |
| 20 | Deck Blade RETURN Relay | Output |
| 22 | Digital Return | |
| 23 | Shifter Neutral IN | Switch Input (open or ground) |
| 24 | Primary Steer Pressure Sensor | Switch Input (open or ground) |
| 25 | Secondary Steering Pressure Sensor | Switch Input (open or ground) |
| 28 | Shifter REV IN | Switch Input (open or ground) |
| 29 | Winch Reel IN Fast Switch | Switch Input (open or ground) |
| 30 | Winch Reel OUT Fast Switch | Switch Input (open or ground) |
| 31 | Winch Reel OUT OFF Switch | Switch Input (open or ground) |
| 32 | Grapple Tong OPEN Switch | Switch Input (open or ground) |
| 33 | Grapple Tong CLOSE Switch | Switch Input (open or ground) |
| 34 | Grapple CW Rotate Switch | Switch Input (open or ground) |
| 35 | Grapple CCW Rotate Switch | Switch Input (open or ground) |
| 36 | Secondary Steering Test Switch | Switch Input (open or ground) |
| 37 | Winch Reel IN Slow Switch | Switch Input (open or ground) |
| 38 | Winch Reel OUT Slow Switch | Switch Input (open or ground) |
| 39 | Winch Free Spool ON Switch | Switch Input (open or ground) |
| 40 | Cable Winch Lever | Switch Input (open or ground) |
| 41 | Deck Blade Lever | Switch Input (open or ground) |
| 44 | Winch Free Spool OFF Switch | Switch Input (open or ground) |
| 46 | Transmission Filter Bypass Switch | Switch Input (open or ground) |
| 47 | Brake Accumulator Pressure Switch | Switch Input (open or ground) |
| 49 | Shifter FORWARD IN | Switch Input (open or ground) |
| 52 | Parking Brake Pressure Switch (N.C.) | Switch Input (open or ground) |
| 53 | Parking Brake Pressure Switch (N.O.) | Switch Input (open or ground) |
| 54 | Winch Reel IN OFF Switch | Switch Input (open or ground) |
| 55 | Operator Mode Select Switch | Switch Input (open or ground) |
| 56 | Can A + | Input/Output |
| 57 | Can A Shield | Input/Output |
| 58 | Grapple Rotate OFF Switch | Switch Input (open or ground) |
| 59 | Grapple Tong OFF Switch | Switch Input (open or ground) |
| 60 | Park Brake Op Switch ON | Switch Input(open or ground) |
| 61 | Park Brake Op Switch OFF | Switch Input(open or ground) |
| 63 | Ground (Extra Pin) | Ground |
| 64 | Can B Data Link + | Input/Output |
| 65 | Can B Data Link - | Input/Output |
| 67 | Can A Data Link + | Input/Output |
| 68 | Can A Data Link - | Input/Output |
| 69 | Can A Shield | Input/Output |
| 70 | Can A - | Input/Output |
| ( 1 ) | The pins that are not shown are not used. |