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J1708 Datalink Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 412 PID: S250 SPN: 608 FMI: 2 LAMP: None SRT: |
Communication between the electronic control module (ECM) and another device on the J1708 datalink has been lost. |
None on performance. J1708 devices possibly will not operate. |
 J1708 Datalink Circuit
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Circuit Description
Devices such as automatic braking system controllers, autoshift transmissions, vehicle ECM, automatic slip reduction systems, electronic displays, electronic information systems, electronic service tools, and VECUs can communicate with the ECM over the J1708 datalink. Messages sent from the devices are received by the ECM and used for controlling the engine. The ECM also transmits information to these devices over the J1708 datalink. This datalink can also be available on the 89-pin OEM harness, pin 31 J1587 positive (+), and pin 30 J1587 negative (-).
Component Location
The J1708 datalink connector is located on the engine harness near the engine data plate on the intake side of the engine.
Shop Talk
This fault occurs whenever the ECM starts communicating with any other device using the J1708 datalink and then can no longer transmit on the datalink. Possible causes could be the following: Unplugging an electronic service tool before keying off the ECM, the J1708 datalink having an intermittent electrical problem, the ECM (or another J1708 device) tying up communications by an electrical problem, or by sending too many messages without stopping.
Refer to Troubleshooting Fault Code t05-412
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