J1587 Power Module Diagnosis - Volvo D9 Installation Manual

Communication, J1587 Power Module Diagnosis

J1587 Power Module Diagnosis

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Supported Power Module diagnosis
Power Module (PM) switch two battery/power supply
inputs to three outputs with different current drive capa-
bilities.
Data bus links used are SAE J1708/J1587.
MID 158 is used when sending on J1587.
Battery # 1 input is connected to starter battery and
Battery # 2 to secondary battery.
Transmitted messages on PM J1587
PPID 194, Proprietary Transmitter System Diagnostics
is used to notify other components on the data link of
diagnostic conditions of parameters that are not avail-
able as standard parameters in J1587 and which are
not appropriate for general use.
The structure follows the general format of proprietary
messages PID 254.
The data bytes are structured in the same way as the
standard message 'Transmitting System Diagnostic'
(PID194), except bit 6 in the DCC (Diagn Code Char)
which is used for the diagnostics of P2PIDs.
1 = standard code: PPID.
0 = extended: P2PPID.
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