79.1 SPN 973/FMI 9
This fault is typically the J1939 EBC1 message from the transmission is missing.
79.1.1
Missing EBC1 Transmission from ABS Check
Check as follows:
1. Check for multiple codes:
[a] If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot these first.
[b] If MCM SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.
[c]
If only a “J1939 Error” fault is present, go to step 2.
2. Has the CPC been recently reprogrammed?
[a] If yes, check the proper configuration of the CPC.
[b] If no, connect ServiceLink to determine which modules are configured for the vehicle
and their communication status. Once this is done, follow the appropriate module
communication troubleshooting procedures for the affected module.
79.2 SPN 973/FMI 13
This fault is typically the engine retarder selection signal is missing.
79.2.1
Missing Engine Retarder Selection Signal Check
Check as follows:
1. Check for multiple codes:
[a] If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot these first.
[b] If MCM SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.
[c] If only a “J1939 Error” fault is present, go to step 2.
2. Has the CPC been recently reprogrammed?
[a] If yes, check the proper configuration of the CPC.
[b] If no, connect ServiceLink to determine which modules are configured for the vehicle
and their communication status. Once this is done, follow the appropriate module
communication troubleshooting procedures for the affected module.
79.3 SPN 973/FMI 19
This fault is typically the engine retarder selection signal is erratic.
79.3.1
Erratic Engine Retarder Selection Signal Check
Check as follows:
1. Check for multiple codes:
[a] If CPC SPN 168/FMI 0/14/18 (Battery Voltage) are present troubleshoot these first.
[b] If MCM SPN 625/FMI 9 is present, troubleshoot and repair the CAN line.
[c] If only a “J1939 Error” fault is present, go to step 2.
2. Has the CPC been recently reprogrammed?
[a] If yes, check the proper configuration of the CPC.
[b] If no, connect ServiceLink to determine which modules are configured for the vehicle
and their communication status. Once this is done, follow the appropriate module
communication troubleshooting procedures for the affected module.
