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267
TM 9-2320-312-24-2
Troubleshooting Section
With NOV99 and newer Personality Modules, an
optional feature was added in order to provide an
input to the ECM. The input is used to connect
an on/off switch for the exhaust brake. The input
uses terminal 16. When the switch is opened, the
ECM will turn off the output circuit for the exhaust
brake. This method allows the ECM to broadcast
the correct status of the exhaust brake over the
data link. With the first method that is described
above, the brake can be disabled but the output
remains active.
Note: If the on/off switch for the exhaust brake is
installed in the output circuit, the "Exhaust Brake
Switch" parameter must be programmed to "NOT
INSTALLED". If the on/off switch is connected to
the ECM switch input (terminal 16), the "Exhaust
Brake Switch" parameter must be programmed to
"INSTALLED".
OCT01 Software
Note: If the on/off switch for the exhaust brake is
installed in the output circuit, the "Exhaust Brake
Switch" parameter must be programmed to "NONE".
If the on/off switch is connected to the ECM switch
input (terminal 16), the "Exhaust Brake Switch"
parameter must be programmed to "J1/P1:16". If
the J1939 data link is used to transmit the status of
the on/off switch for the exhaust brake, the "Exhaust
Brake Switch" parameter must be programmed to
"Cab Controller", "Body Controller", or "Instrument
Cluster". If the parameter is programmed to one
of the J1939 options, the switch status will be
transmitted to the ECM over the J1939 data link. If a
problem is suspected with the J1939 data link, refer
to Troubleshooting, "Powertrain Data Link Circuit -
Test".
g00729018
Illustration 98
Schematic for the exhaust brake that is powered by a relay circuit

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