2007 T800 CM870 mulitplexing timeout

[SDS]

Looking for a little insight. Have a 07 T800 with a cm870. Check engine light on with code 0285. Truck is in derated and undriveable. Truck was in the shop for a new lift pump, after pump was installed INSITE was used to clear codes for low fuel pressure and then 0285 showed up active and wont go inactive. The resistance on the network shows good at 60 ohms. Live data wont show my accelerator percentage and the idle validation pid reading shows off idle till you hit the pedal, then shows idle. If I'm seeing it right the abs module cant communitcate with the ecm? Did INSITE clean the source address and causing the communication fault? Using JPRO i can see the ECM, Body controller, and bendix module are still all alive but the fault obviously says not on j1939.

[Rawze]

Looks to me like it is reporting the trucks ABS module is not connected properly or has some other issue. Fix the ABS module?.

[SDS]

I agree abs is talking but not properly. Also saw this fwiw, this truck is not equipped with a retarder fyi.

[Rawze]

(12-21-2022 )SDS Wrote:  I agree abs is talking but not properly. Also saw this fwiw, this truck is not equipped with a retarder fyi.

you need to check those options with the cummins Insite software, not some third party stuff that may or may not be able to read things correctly.