Electronic Control Module (ECM)
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| Illustration 1 | g06246556 |
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Machine ECM (1) Controller (2) J1 Connector (3) J2 Connector | |
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| Illustration 2 | g06246551 |
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Connectors of Machine ECM (2) J1 Connector (3) J2 Connector | |
The output from the Machine ECM is based on input information from the sensors. The output commands are based on the software programmed into the control module. After the Machine ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the ECM are connected to the machine harness by one 81-pin connector and one 40-pin connector (J1 and J2). The inputs and outputs to the ECM can be viewed through the Caterpillar Electronic Technician (Cat ET). Input and output information can also be viewed using the Operator Monitor.
The ECM also communicates with sensors and other control modules via the CAN Data Link. The data link is bi-directional, allowing the Machine ECM to both receive and send information with the Engine ECM. The Machine ECM also communicates to input and output components that are directly connected to the Switch Panel. The Switch Panel is used to link input and output components to the Machine ECM via the CAN Data Link.
Note: Only the complete ECM is serviced (no lower levels components). The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.
The Cat Data Link is used to provide a connection for the service tool for troubleshooting, testing, and calibrations. The data link is bidirectional. The data link allows the ECM to receive information. The data link also allows the ECM to send information.
| Machine ECM Connector Contact Descriptions (81-pin)(1) | ||
|---|---|---|
| No. | Type | Pin Description |
| 1 | Ground | -Battery |
| 2 | Ground | PRV Return 8-10 |
| 3 | Ground | PRV Return 4-7 |
| 4 | Power | +Battery |
| 5 | Ground | PRV Return 1-3 |
| 8 | Input/Output | CAN 2+ Machine Data Link |
| 9 | Input/Output | CAN 1+(J1939) Data Link |
| 12 | Input | Boom Up Control Pilot Pressure Sensor |
| 13 | Input | Right Travel Pressure Sensor |
| 14 | Input | Left Travel Pressure Sensor |
| 15 | Power | Power Supply (5V) |
| 16 | Input | Implement Pressure Sensor |
| 17 | Input | Atmosphere Sensor |
| 18 | Input | Fuel Filter Plugged Sensor |
| 20 | Power | Power Supply (8V) |
| 22 | Output | Hydraulic Lock Solenoid |
| 23 | Output | Swing Brake Solenoid |
| 24 | Output | Travel Speed Solenoid |
| 27 | Input/Output | CAN 2- Machine Data Link |
| 28 | Input/Output | CAN 1- (J1939) Data Link |
| 29 | Input | One Touch Low Idle Switch |
| 32 | Input | Engine Oil Pressure Sensor |
| 34 | Ground | Analog and PWM Return 1 |
| 35 | Input | Hydraulic Oil Temperature Sensor |
| 36 | Input | Ambient Sensor |
| 38 | Input | Analog and PWM Return 2 |
| 39 | Input | Engine Speed Command |
| 41 | Input | Key Switch |
| 42 | Output | Fan Solenoid |
| 43 | Output | Straight Travel Solenoid |
| 49 | Input | STG Return 1 |
| 52 | Input | Foot Switch |
| 54 | Input | Pump 1 Pressure Sensor |
| 55 | Input | Pump 2 Pressure Sensor |
| 58 | Input | Hydraulic Lock Cancel Switch |
| 59 | Input | Glow Plug Status |
| 60 | Input | Start Detection |
| 61 | Output | Neutral Start Relay |
| 62 | Output | Shutoff Solenoid |
| 67 | Input | User Defined Shutdown Switch |
| 73 | Input | Engine Speed Command Read |
| 74 | Input | Fan Speed Sensor / Squeeze Pressure Sensor |
| 75 | Input | Thumb Wheel - LH |
| 76 | Input | Thumb Wheel - RH |
| 78 | Input | Engine Speed Sensor |
| 79 | Output | Flow Limit Pressure PRV |
| 80 | Output | 2 Pump Flow Combine Solenoid |
| 81 | Output | PS Pressure PRV |
| (1) | Contacts that are not listed are not used. |
| Machine ECM Connector Contact Descriptions (40-pin)(1) | ||
|---|---|---|
| No. | Type | Pin Description |
| 88 | Output | ATT Stem 3 Retract PRV |
| 89 | Output | ATT Stem 3 Extend PRV |
| 96 | Output | ATT Stem 2 Retract PRV |
| 97 | Output | ATT Stem 2 Extend PRV |
| 104 | Output | ATT Stem 1 Retract PRV |
| 105 | Output | ATT Stem 1 Extend PRV |
| 106 | Input | ATT Stem 1 Status Sensor |
| 108 | Input | ATT Stem 3 Status Sensor |
| 109 | Input | ATT Stem 4 Status Sensor |
| 112 | Output | Variable Relief 1 PRV |
| 113 | Output | Variable Relief 2 PRV |
| 114 | Ground | PRV 17-18 Return |
| 115 | Ground | - Battery |
| 116 | Ground | - Battery |
| 117 | Ground | PRV 13-14 Return |
| 118 | Ground | PRV 15-16 Return |
| 119 | Ground | PRV 11-12 Return |
| 120 | Ground | + Battery |
| 121 | Ground | + Battery |
| (1) | Contacts that are not listed are not used. |