Illustration 87 Engine Running Output Circuit

252

TM 9-2320-312-24-2

Troubleshooting Section

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Illustration 87

Engine Running Output Circuit

Personality Modules that have a Software Date

Code dated OCT01.

GMT-560 applications have a programmable

parameter "Engine Running Output" that can be

programmed to "P1/J1:31". If this parameter is

programmed, the engine running output is located

on ECM J1/P1:31 (Output 9). This feature allows

the ECM to control a relay in order to prevent the

starter motor from being engaged after the engine

has started.

When the ignition key switch is turned to the ON

position, Output 9 is low. The relay is off and

the switch is closed. Current flows to the starter

solenoid and this allows the starter to engage.

When the engine speed reaches 600 rpm the output

will go high. This energizes the relay and the switch

opens. When the switch is open there is no current

flow to the starter solenoid.

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Illustration 88

Engine Running Output Circuit for GMT-560