| Contact Description on CX31 Machine | |
|---|---|
| No. | Function |
| J1-1 | Keyswitch Input (ON position) |
| J1-2 | Engine Speed Sensor + |
| J1-3 | Engine Speed Sensor − |
| J1-4 | Torque Converter Output Speed + |
| J1-5 | Torque Converter Output Speed − |
| J1-6 | Transmission Output Speed A + |
| J1-7 | Transmission Output Speed A − |
| J1-8 | Transmission Output Speed B + |
| J1-9 | Transmission Output Speed B − |
| J1-10 | J1587 + |
| J1-11 | Oil Level Sensor Power |
| J1-13 | − Battery |
| J1-20 | J1587 - |
| J1-21 | Sensor Return |
| J1-22 | Transmission Oil Temperature Sensor |
| J1-23 | − Battery |
| J1-29 | Torque Converter Temperature |
| J1-31 | + Battery |
| J1-32 | ECM Location Enable - DO NOT USE |
| J1-36 | Transmission Oil Level Sensor |
| J1-38 | + Battery |
| J1-48 | Latching Gear Sol/Switch to Battery 2 |
| J1-49 | Clutch 2 Solenoid |
| J1-50 | Solenoid Return 2 |
| J1-51 | Clutch 3 Solenoid |
| J1-52 | Clutch 4 Solenoid |
| J1-58 | Clutch 5 Solenoid |
| J1-59 | Clutch 1 Solenoid |
| J1-60 | Solenoid Return 1 |
| J1-61 | Retarder Solenoid/Switch to Battery 3 |
| J1-62 | Lockup Clutch Solenoid |
| J1-63 | Transmission Oil Filter Bypass Switch |
| Contact Description on CX31 Machine | |
|---|---|
| No. | Function |
| J2-1 | Keyswitch Input (Key in the START position) |
| J2-5 | Backup Alarm Relay |
| J2-6 | PTO Enable Relay |
| J2-7 | Start Interlock Relay |
| J2-8 | Load Return |
| J2-9 | Check Transmission Lamp |
| J2-10 | Alternator Start In Gear Lamp |
| J2-11 | Gear Driver Output |
| J2-12 | Transmission Temperature/Filter Bypass Lamp |
| J2-13 | Speed Enable Output |
| J2-14 | Switch to Battery 1 |
| J2-19 | Speedometer Driver Output |
| J2-22 | Sensor Common |
| J2-23 | Retarder Shift Point Enable Switch |
| J2-26 | Quick Gear Limit |
| J2-28 | Minimum Forward Start Gear |
| J2-29 | Parking Brake Switch |
| J2-30 | Neutral to Gear Inhibit Switch |
| J2-31 | Direction Inhibit Switch |
| J2-33 | Shift Display Blank Input |
| J2-34 | Economy Mode |
| J2-35 | Shift Selector Input |
| J2-36 | Service Brake Switch |
| J2-38 | Retarder Medium |
| J2-40 | Auto Neutral Switch Input 1 |
| J2-41 | Auto Neutral Switch Input 2 |
| J2-42 | Retarder Lo/High |
| J2-46 | PTO Enable Switch 1 |
| J2-47 | PTO Enable Switch #2 |
| J2-54 | Driveline PTO Switch |
| J2-55 | Hold Gear Switch |
| J2-64 | Driveline PTO Engaged Input |
| J2-67 | J1939 + |
| J2-68 | J1939 - |
| J2-69 | J1939 Shield |
| Contact Description on 12 Pin Connector | |
|---|---|
| No. | Function |
| 1 | CAN HI |
| 2 | Shift Selector ID 1 |
| 3 | Ignition |
| 4 | Unused |
| 5 | J1939 Shield |
| 6 | Display Dimmer |
| 7 | CAN LOW |
| 8 | Shift Selector ID 2 |
| 9 | Unused |
| 10 | Unused |
| 11 | + Battery (Unswitched) |
| 12 | - Battery (Ground) |
| Contact Description on 24 Pin Connector | |
|---|---|
| No. | Function |
| 1 | + Battery |
| 2 | Switch to Battery 2 |
| 3 | + Battery |
| 4 | Unused |
| 5 | Switch to Battery 3 |
| 6 | Unused |
| 7 | Ignition Switch |
| 8 | Unused |
| 9 | Unused |
| 10 | Unused |
| 11 | Unused |
| 12 | J1587 + |
| 13 | Unused |
| 14 | Unused |
| 15 | Unused |
| 16 | Unused |
| 17 | - Battery |
| 18 | J1587 - |
| 19 | - Battery |
| 20 | Unused |
| 21 | Unused |
| 22 | Unused |
| 23 | Unused |
| 24 | Unused |
| |
| Illustration 1 | g01255959 |
|
Transmission ECU (1) ConnectorJ1 (2) ConnectorJ2 | |
| |
| Illustration 2 | g01296923 |
|
OEM 24-pin connector | |
Decisions are made by the circuits in the electronic control module. Software in the electronic control unit activates the electronic circuits in the appropriate way to correctly operate the vehicle. Connectors join the harness wiring to the inputs and outputs of the electronic control unit. There are two connectors with 70 contacts. Complete diagnostic trouble codes are available with the ET.
The electronic control unit monitors the condition of the vehicle for Proper system operation. Components sense the condition of the vehicle. Components then send electrical signals to the inputs of the electronic control unit. The electronic control unit compares the information from the inputs to the stored information. The electronic control unit then decides if outputs will be activated. The activation is performed by sending electrical signals through the outputs to an electronic circuit.
Numerous inputs to the electronic control unit are used in order to interrelate with the chassis and to monitor the condition of the transmission. Two types of inputs exist. One type of input is the switch input. The other input device is a sensor. Switches and harness wiring provide signals to the switch inputs of the electronic control module. Switch conditions include open circuit, short to +battery and short to ground. Sensors provide monitored condition signals to the sensor input of the electronic control unit.
The electronic control module responds to decisions by sending electrical signals through various outputs. The outputs are used for all of the following items:
- Create an action.
- Provide information to other devices.
- Supply sensor power.
The SAE J1939 Data Link is used to communicate with a service tool or other electronic control modules (if equipped). The data link is bidirectional. Bidirectional communication allows sharing of information.