Using the CAT Com Adaptor 3 with other OEM software (VOLVO and Cummins)

[Justin288]

The CAT Communications Adaptor 3 (CAT Com Adaptor 3) is a versatile tool used primarily for Caterpillar diagnostic software. However, it can also be configured to work with other OEM diagnostic software such as VOLVO and Cummins. Here we will show you how to set it up and learn the pinouts required for proper communication.

Compatibility and Setup

1. Compatibility
- VOLVO: The CAT Com Adaptor 3 can be used with VOLVO diagnostic software such as PTT (Premium Tech Tool).
- Cummins: The adapter can also be used with Cummins diagnostic software such as INSITE.

2. Adapter Configuration
- Software Configuration: To use the CAT Com Adapter 3 with other OEM software, you must configure the software settings to recognize the adapter. This usually requires selecting the CAT Com Adapter 3 as the communications interface in the software settings.
- Drivers: Make sure the drivers required for the CAT Com Adapter 3 are installed on the computer running the OEM diagnostic software.

CAT Com Adapter 3 Pinout

Standard J1939 Pinout for Diagnostic Connector
The J1939 diagnostic connector is typically a 9-pin Deutsch connector (may be 6-pin on older systems). The pinout for a standard J1939 connector is as follows:

1. Pin A: Battery Positive (+)
2. Pin B: CAN High (J1939+)
3. Pin C: Battery Negative (−)
4. Pin D: No connection
5. Pin E: Termination resistor
6. Pin F: No connection
7. Pin G: CAN Low (J1939−)
8. Pin H: No connection
9. Pin J: Ignition

CAT Com Adapter 3 Specific Pin Assignment
When configuring the CAT Com Adapter 3, make sure it corresponds to the pin assignment required by your OEM software. The general pin assignment for the CAT Com Adapter 3 is:

1. Pin A: Ground
2. Pin B: Battery Power
3. Pin C: CAN High
4. Pin D: CAN Low

Wiring and Adapters
Depending on your vehicle's diagnostic connections and the CAT Com Adapter 3, you may need additional cables or adapter wire harnesses. These are available from CAT or third-party providers specializing in diagnostic tools and accessories.

Step-by-Step Guide

1. Install drivers and software
- Install the drivers required for the CAT Com Adapter 3.
- Install the VOLVO PTT or Cummins INSITE software on your computer.

2. Connect the adapter:
- Plug the CAT Com adapter 3 into the vehicle's diagnostic port with the corresponding plug.
- Connect the adapter to your computer via USB or Bluetooth depending on the adapter model.

3. Configure the software:
- Open the OEM diagnostic software.
- Go to the Settings or Configuration section and select CAT Com Adapter 3 as your communications interface.

4. Verify the connection:
- Verify the software recognizes the adapter and connects it to the vehicle's ECU.
- Run a test read or diagnostics to verify communications.

5. Pinout Match:
- If communication fails, double-check the pinout configuration and ensure the adapter is wired correctly to meet the requirements of your vehicle's diagnostic port.

Following the steps below for proper configuration will allow the CAT Com Adapter 3 to be used with VOLVO and Cummins diagnostic software. For specific pinout diagrams and wiring adapters, refer to the manual provided by CAT or consult a vehicle diagnostic professional.

[Tina Rydel]

the Caterpillar ET3 Adapter III help me solve the problem. 
Now, let's walk through the process of conducting injector solenoid testing using the caterpillar et diagnostic tool:


Step 1: Connect the Adapter - Connect the cat et3 to the diagnostic port on the engine using the appropriate cables.

Step 2: Access the ECM - Launch the Caterpillar Electronic Technician (ET) software on a laptop or computer. Establish communication with the ECM by selecting the appropriate engine model.

Step 3: Navigate to Injector Testing - Within the ET software, locate the injector testing feature. This function enables you to perform various tests, including solenoid testing.

Step 4: Select the Solenoid Test - Choose the solenoid test option from the menu. This will initiate the testing process.

Step 5: Follow On-Screen Instructions - The ET software will provide step-by-step instructions on how to proceed with the solenoid testing. It will guide you through the necessary actions, such as activating or deactivating the solenoids.

Step 6: Interpret the Results - Once the solenoid testing is complete, the ET software will display the results. Analyze the readings to identify any solenoids that may be faulty or require further investigation.

4. Additional Tips for Effective Testing:
To ensure accurate testing and reliable results, here are some additional tips:

Always follow the manufacturer's guidelines and safety precautions when using diagnostic tools.
Make sure the engine is at operating temperature before conducting solenoid testing.
Regularly update your Caterpillar ET software to access the latest features and improvements.
Familiarize yourself with the specific testing procedures recommended by Caterpillar for your engine model.


Injector solenoid testing is an essential procedure to maintain optimal engine performance and prevent potential issues. The Caterpillar ET3 Adapter III, along with the Caterpillar ET software, provides a comprehensive solution for injector solenoid testing on Caterpillar engines. By following the step-by-step guide outlined in this article, technicians can effectively diagnose and address any solenoid-related problems, ensuring the smooth operation of these powerful engines.