...SAE J1939 Data Link - Abnormal Update Rate

17/09/2016

SAEJ1939DataLink - Abnormal UpdateRate

FAULT CODE 427 SAE J1939 Data Link - Abnormal Update Rate Printable Version

Overview CODE Fault Code: 427 PID: S231 SPN: 639 FMI: 9/9 LAMP: None

REASON J1939 Data Link - Abnormal Update Rate. Communication between the electronic control module (ECM) and another device on the SAE J1939 data link has been lost.

EFFECT Engine speed will ramp down and remain at idle.

SRT:

SAE J1939 Data Link Circuit SMALL | MEDIUM | LARGE

Circuit Description Devices such as ABS controllers, autoshift transmissions, ASR systems, electronic displays, electronic information systems, electronic service tools, and vehicle electronic control unit(s) (VECUs) can communicate with the ECM over the SAE J1939 data link. 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 SAE J1939 data link. Component Location The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/120/120-fc427.html?q=427

1/2

17/09/2016

SAEJ1939DataLink - Abnormal UpdateRate

Conditions for Running the Diagnostics This diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting the Fault Codes The ECM does not receive a valid J1939 message from a multiplexed device for more than 1second. The ECM detects an open or short circuit condition in the J1939 data link harness. Action Taken When the Fault Code is Active The ECM will log the fault code immediately when the diagnostic runs and fails. The ECM will use a default state as an input for the multiplexed device. Conditions for Clearing the Fault Code To validate the repair, start the engine and let it idle for 1 minute. The fault code status displayed by the INSITE electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes. The “Reset All Faults” command in the INSITE electronic service tool can be used to clear active and inactive faults. Shop Talk Possible causes of this fault include: Electrical problems with the SAE J1939 data link wiring such as grounded, shorted, or open circuits The ECM (or another SAE J1939 device) tying up communications by sending too many consecutive messages The external OEM controlling device has malfunctioned or can no longer transmit on the data link. Refer to Troubleshooting Fault Code 427 . Last Modified: 03-Feb-2010 Copyright © 2000-2010 Cummins Inc. All rights reserved.

https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/120/120-fc427.html?q=427

2/2