Qualcomm OBDII J1708 Guía para resolver problemas descargar pdf (Pagina 57)

80-JB566-1 Rev. C 19-1

MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION

J1939 Packet Detection Problem

Problem: J1939 Packet Detection Fails

Ignition must be on for the truck to broadcast/supply vehicle data.

Note

If the Core Data Items test passes (i.e. green check), it’s acceptable for the J1939 Packet

Detection test to fail. It would mean that the MCP50 system is getting its vehicle data from

the J1587 link.

This is determined by the VDS configuration sent to the unit from the Vehicle Data

Configuration (VDC) on the Customer Portal. Contractors and Service Centers should first

contact the customer to verify that the units were configured correctly.

In order to get J1939 data, a truck’s engine must be supplying the J1939 data, a connection

must be made to the J1939 wires (Power/IO cable), and the unit must be configured to look

for the J1939 data. Many old trucks/engines do not transmit J1939 packets.

If packets are not detected, check the connections to the J1939 data link and verify that it is

properly configured.

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Qualcomm OBDII J1708 Guía para resolver problemas Pagina 57