V-MAC Co-Pilot Operator’s Manual 49 Engine Brake
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Figure 26 — Engine Brake Switch
To activate the engine brake, move the engine brake switch to the 1st or 2nd ON position. The 1st position activates the engine brake unit for 50% power. The 2nd position provides 100% power. The engine brake switch can be in either 1st or 2nd ON position during speed control operations, but the brake will function only if no fuel is requested by vehicle management and control (V-MAC) IV and engine speed (RPM) is greater than 900 RPM. To disengage the brake, move the switch to the OFF position, or press the accelerator pedal (AP). Note: The engine brake will not engage until the engine oil temperature (EOT) has reached 52°C (125°F).
ACCESSORY RELAY CONTROL After an idle shutdown, vehicle management and control (V-MAC) IV will deactivate all the ignition power bus relays, but the engine control module (ECM) power relay will remain active in order to reduce current draw from the battery after the engine has stopped.
