Emergency Buzzer
The emergency buzzer sounds during the ignition sequence and whenever one of the following conditions exists:
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The engine oil pressure falls below the preset level which is 6 psi (41 kPa) at 700 rpm, or 18 psi (124 kPa) at 4400 rpm.
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The air pressure falls below the preset level, which is 65 psi (448 kPa).
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The parking brake is set with the vehicle moving at a speed greater than 2 mph (3 km/h).
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The coolant temperature rises above 253°F (123°C) and the check engine and stop engine lights illuminate. When the coolant temperature falls below 244° (118°C) the emergency buzzer and stop engine light will turn off.
Note: The check engine light will remain on until the vehicle is inspected at an authorized Freightliner service facility.