Understanding the Hino Obd2 Pinout is essential when you need to connect your J1939 diagnostic tools to Hino trucks. Hino trucks, like many modern commercial vehicles, utilize standardized diagnostic protocols, but sometimes require adapters to bridge different connector types. This article provides a clear overview of the Hino OBD2 pinout and how it relates to J1939 connections, ensuring you can effectively diagnose and maintain your Hino vehicles.
For connecting a J1939 diagnostic tool, which typically uses a 9-pin connector, to a Hino truck equipped with an OBD2 style connector, you’ll need a specific adapter. It’s important to note that there are variations in wiring depending on the age of the Hino truck. Specifically, there are adapters designed for newer Hino models (approximately 2014 and newer) and older models. To ensure you have the correct adapter and understand the connections, refer to the wiring details below.
Wiring Connections for Hino OBD2 to J1939 Adapter
The following table outlines the wiring connections for both older and newer Hino truck OBD2 pinouts when adapting to a J1939 connector. This pinout is crucial for verifying compatibility and troubleshooting connection issues.
| 16-pin OBD2 Connector | Old Signal | Old J1939 Pin | New Signal | New J1939 Pin |
|---|---|---|---|---|
| 1 | 24V Battery | B | 24V Battery | B |
| 2 | ISO-L Line | – | J1939+ | C |
| 3 | J1939- | D | J1939- | D |
| 6 | Autolevel Rx | – | – | – |
| 7 | – | – | ISO-K Line | – |
| 9 | Autolevel Init | – | – | – |
| 10 | ISO-K Line | – | – | – |
| 11 | J1939+ | C | – | – |
| 12 | Signal Ground | A | – | – |
| 13 | Chassis Ground | – | – | – |
| 14 | Autolevel Tx | – | – | – |
| 15 | – | – | Ground | – |
| 16 | – | – | Ground | A |
This table clearly differentiates the pin assignments for older and newer Hino trucks, highlighting the changes in signals and their corresponding J1939 pin positions. For instance, you can see that pin 2 on the 16-pin OBD2 connector is used for the ISO-L Line in older configurations but becomes the J1939+ line in newer setups. Similarly, pin 11 transitions from J1939+ in older models to unused in newer ones, while pin 7 changes from unused to ISO-K Line. Ground connections also shift between pin 12 (Signal Ground) and pin 16 (Ground) in relation to J1939 pin A.
Understanding these wiring differences is crucial when selecting the correct adapter. Using the wrong adapter can lead to communication issues or potentially damage your diagnostic equipment or the vehicle’s electronic systems. Always verify the model year of the Hino truck and compare it with the adapter specifications to ensure compatibility.
Other Diagnostic Adapters for Commercial Vehicles
Besides the Hino OBD2 to J1939 adapter, a range of adapters are available to facilitate diagnostics across different commercial vehicle makes and models. These adapters address various connector types and protocol adaptations, streamlining the diagnostic process in diverse fleet environments. Some common examples include:
- J1939 Female to OBD2 Female Adapters: These allow connection of OBD2-style testers or devices, like GPS trackers, to vehicles equipped with a J1939 9-pin connector.
- J1939 Male to OBD2 Male Adapters: Designed for using J1939 scan tools on vehicles that have an OBD2 style diagnostic port but still utilize the J1939 protocol.
- Volvo M-M Adapters: Specifically for Volvo chassis with Volvo engines from 2013 onwards, adapting their OBD2 style connector to standard J1939 testers.
- GMC Top Kick M-M Adapters: Addressing GMC Top Kick trucks with Cummins or CAT engines, which use OBD2 style connectors but may operate on J1708 or J1939 data protocols respectively.
- Allison to J1939 Adapters: For Allison transmissions and some Detroit Diesel applications that use a 16-pin OBD2 style connector but with a different ground pin configuration (pin 4 instead of pin 5), allowing connection of standard J1939 accessories.
In conclusion, when working with Hino trucks and J1939 diagnostic tools, understanding the Hino OBD2 pinout and the correct adapter for your truck’s model year is vital. Utilizing the appropriate adapter ensures seamless communication and accurate diagnostics, saving time and preventing potential damage. For specialized needs or unique configurations not covered by standard adapters, custom cable solutions are also available to meet specific diagnostic requirements.
