| Contact Description on CX28 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 | Transmission Oil Level Sensor Power 5+ |
| J1-12 | Low Range Solenoid driver |
| J1-13 | - Battery |
| J1-15 | T-Case Speed + |
| J1-16 | T Case Speed – |
| J1-20 | J1587 - |
| J1-21 | Sensor Return |
| J1-22 | Transmission Oil Temperature Sensor |
| J1-23 | - Battery |
| J1-29 | Torque Converter Oil Temperature Sensor |
| J1-31 | + Battery |
| J1-36 | Transmission Oil Level Sensor |
| J1-38 | + Battery |
| J1-48 | Fail In Gear Solenoid |
| 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 | Switch to Battery 3 |
| J1-62 | Lockup Clutch Solenoid |
| J1-63 | Transmission Oil Filter Bypass Switch |
| J1-65 | Front Side to Side wheel lock output |
| J1-66 | Rear Side to Side wheel lock output |
| Contact Description on CX28 Machine | |
|---|---|
| No. | Function |
| J2-1 | Keyswitch Input (Key in the START position) |
| J2-2 | Differential Lock Solenoid Output |
| J2-3 | Transfer Case Neutral Solenoid Output |
| J2-4 | Transfer Case Solenoid Return |
| J2-6 | PTO Enable Relay |
| J2-7 | Starter Interlock Relay |
| J2-8 | Load Return |
| J2-9 | Check Transmission 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 | Output Speed Driver |
| J2-20 | Secondary Axle Differential lock Output |
| J2-21 | Low range Engaged Output |
| J2-22 | Switch Return |
| J2-23 | Retarder Shift Point Enable Sw Input |
| J2-26 | Quick Gear Limit Switch |
| J2-29 | Parking Brake Switch |
| J2-30 | Neutral to Gear Inhibit |
| J2-31 | Direction Inhibit SWG |
| J2-34 | Economy Mode |
| J2-36 | Service Brake Switch |
| J2-40 | Auto Neutral Input 1 Switch |
| J2-41 | Auto Neutral Input 2 Switch |
| J2-46 | PTO On/Off 1 Switch |
| J2-55 | Hold Gear Switch |
| J2-58 | Front Side to Side Lock Sw Input |
| J2-59 | Rear Side to Side Lock Sw input |
| J2-67 | J1939 + |
| J2-68 | J1939 - |
| J2-69 | J1939 Shield |
| Contact Description on Shifter 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 Transfer Case 12 Pin Connectorr | |
| PIN No. | Function |
| 1 | T-Case Speed Sensor + |
| 2 | T-Case Speed Sensor - |
| 3 | Differential Lock Solenoid |
| 4 | Transmission Neutral Solenoid |
| 5 | Low Range Solenoid |
| 6 | Solenoid Return |
| 7 | Indicator Lamp |
| 8 | Ground |
| 9 | Ground |
| 10 | T-Case Oil Temp Sensor |
| 11 | Not Used |
| 12 | Not Used |
| Contact Description on 40 Pin Connector | |
|---|---|
| No. | Function |
| 1 | Battery Supply (unswitched batt +) |
| 2 | Gear Driver (Gear Indicator Driver Circuit) |
| 3 | Battery Supply (unswitched batt +) |
| 4 | Speed Enable Output |
| 5 | Differential Lock Signal |
| 6 | Quick Gear Limit Input |
| 7 | Keyswitch (Ignition) |
| 8 | Neutral to Gear Inhibit |
| 9 | Front Axle Differential Lock Enable Output |
| 10 | Smart Low Range Indicator |
| 11 | T-Case Low Range Detent Switch |
| 12 | T-Case Low Range Request Switch |
| 13 | Rear Axle Differential Lock Switch Input (SWC) |
| 14 | Economy Mode Input |
| 15 | Auto Neutral #2 |
| 16 | Battery - |
| 17 | ATA(J1587) + |
| 18 | ATA(J1587) - |
| 19 | Battery - |
| 20 | Starter Enable |
| 21 | Rear Axle Differential Lock Enable Output |
| 22 | PTO Enabled Output |
| 23 | Starter Interlock Relay |
| 24 | Load Return 2 |
| 25 | Check Transmission Lamp |
| 26 | SWB input #1 |
| 27 | Warning Lamp |
| 28 | Output Speed Driver |
| 29 | Digital Return |
| 30 | Retarder Shift Point Enable Switch |
| 31 | Parking brake |
| 32 | Direction Inhibit SWC |
| 33 | Service Brake |
| 34 | Auto Neutral SWC |
| 35 | ALL Axle Differential Lock Switch Input (SWC) |
| 36 | J1939 - |
| 37 | J1939+ |
| 38 | PTO Enabled SWC |
| 39 | Switch to Battery #3 |
| 40 | Hold Gear SWC |
 | |
| Illustration 1 | g01255959 |
Transmission ECU (1) ConnectorJ1 (2) ConnectorJ2 | |
Note: Harness connector C1 mates to ECM J1 and Harness connector C18 mates to ECM J2.
 | |
| Illustration 2 | g02319988 |
OEM 40-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.
Inputs
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.
Outputs
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.
Input/Output
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.