BlueFire Data Adapter - J1708 Data Bus

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The Data Adapter

 Set 'Adapter Minimum Interval' to 500 or greater.

 Uncheck 'Connect to a J1708 Data Bus' if not needed.

 Check 'Performance 1' and Performance 2' under Performance.

 If the connection improves go back and remove the changes you made above one by one

until the connection becomes unstable again then change it back.

 If you're using the Windows App and have a USB drive or SD card inserted, remove them

and see if the connection improves. It has been reported that on some Windows

computers, the USB and SD ports can affect the Bluetooth connection.

J1708 Data Bus

Both a 6-pin and a 9-pin diagnostic port has the capability of retrieving J1708 data using our 6-pin

and 9-pin adapters. The 6-pin adapter can only retrieve J1708 data while the 9-pin adapter can

retrieve both J1708 and J1939 data. It is common for vehicles 2004 and newer to have both data

buses thus the need for the 9-pin adapter to be able to connect to both.

The 6-pin adapter is no longer available but you can still connect to a 6-pin diagnostic port by

using a 9-pin adapter and a 6-pin to 9-pin converter connector or cable. Links to the converter

connector and cable are on our website/store.

Important - For 9-Pin adapters the BlueFire App defaults to connecting to the J1939 data bus

only. You must check the Setting 'Connect to a J1708 Data Bus' to connect and retrieve J1708

data.

The J1708 data bus was the first electronic data bus to be used in heavy duty vehicles. The

Society of Automotive Engineers (SAE) developed a specification that defined the hardware

(J1708) and software (J1587) for OEM engineers to program their ECMs. This specification and its

implementation improved over time so the newer the vehicle the better chance of having ECMs

that adhere to the specification.

The firmware in our 6-pin and 9-pin adapters attempts to cater for the various anomalies in ECM

implementations of the specification but it is not always successful. The possible results in an

incomplete specification implementation include

 Erratic data

 Incomplete data

 Phantom fault reporting

 Actual engine or other ECM faults.

The BlueFire App tries to moderate the first three but the last one is the most serious as it can

cause your vehicle to stop operating. If you get a check engine light (ECM fault) while connected