The J1939 Splice Adapters (1024, 1025, 1026) are part of the backbone of the data link (The backbone will come in on 2 terminals and leave on 2 different terminals). The wiring from the connector to each module is a stub.

There may be a problem in the J1939 wiring between the ECU and the J1939 backbone. Check J1939 circuit resistance at the ECU. If the result is 60 Ω the ECU is probably at fault. If the result is NOT 60 Ω check and repair J1939 datalink wiring. All ECUs fail to respond. The J1939 datalink polarity may be reversed at the diagnostic connector.

• Measure the J1939 voltage of the J1939 (-) pin to battery ground at the 3 pin connector for the J1939 data link. Refer to Procedure 019-417 Specification • A malfunctioning wiring harness has been detected due to the J1939 data link circuit being shorted to a voltage source if the voltage is greater than the following specification: 4.5 VDC

the J1939 datalink. CGW — Central Gateway Communication Protocol — A set of rules governing communication between electronic devices. Datalink — A collection of wires, connecting system components, through which data is transmitted. Datalink Topology — The arrangement in which the nodes (ECUs) of a datalink are connected to each other.

module (ECM) via the J1939 data link. The aftertreatment intake NOx sensor performs internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment

engine control module via the J1939 data link. The aftertreatment diesel partculate filter temperature sensor module performs its own internal diagnostics and reports malfunctions back to the engine control module using the J1939 data link. The aftertreatment diesel particulate filter temperature sensor module is used to measure the aftertreatment

The Engine Control Module (ECM) did not receive a valid J1939 data link message from the Variable Geometry Turbocharger (VGT) actuator for more than 1 second. Action Taken When the Fault Code is Active: • The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.

from the OEM VECU to the Cummins ECM over the SAE J1939 data link. Messages sent from OEM VECUs or transmission ECUs are received by the Cummins ECM and used for controlling the engine. The Cummins ECM and OEM VECUs must be configured properly so that proper operation of the multiplexed components will occur. Component Location:

CUMMINS Electrical Wiring Diagrams M11 CELECT PLUS (1995-1998) Version #2 | 9-14-19 Revision #1 | 10-11-18

The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options. Conditions for Running the Diagnostics: This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault Codes: The Engine Control Module (ECM) did not receive a message from a multiplexed device.