Illustration 98 Schematic for the exhaust brake that is powered by a relay circuit

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