Instruments and Controls Identification VIGIL III Warning System, Optional All shutdown features have an automatic over- ride. If the vehicle needs to be moved to a safe location after shutdown, just crank the engine. It will run for about 30 seconds before shutting down again. The VIGIL III system is an electronically controlled warning system with maximum vehicle speed control, vehicle overspeed reporting, and optional engine shutdown. It controls the turn signal functions and various optional functions. A solid-state lightbar ( Fig. 2.23 ) in the instrument panel contains displays for the functions.
Turn Signal Functions The system operates the turn signal relay and the turn indicators ( Fig. 2.23 ). The system features a special heavy-duty relay for flashers, capable of driving up to fourteen 32- candlepower bulbs. 1 2 3 4 5 6 7 8 9 10 10/26/98 f600292b 1. Left-Turn Signal Light 2. Oil Pressure Warning Light 3. Starter Lockout Warning Light 4. Low-Water Warning Light 5. Water Temperature Warning Light 6. Engine Shutdown Light 7. High-Beam Indicator Light 8. Overspeed Light 9. Low Air Pressure Warning Light 10. Right-Turn Signal Light Other Functions The system protects the starter by locking out the starter button whenever any of the following condi- tions exist:
Voltage at the key switch is greater than 18 volts or less than 9 volts before the starter but- ton is pressed. The starter button has been pressed within the last two seconds. Fig. 2.23, VIGIL III Warning System, Optional Engine speed exceeds 350 rpm. Engine Functions The starter has been cranked for a total of 30 seconds within the last minute (the starter but- ton is locked out for two minutes to allow the starter to cool). The system monitors engine coolant temperature, coolant level, and oil pressure. If the engine overheats, a warning light ( Fig. 2.23 ) comes on and a buzzer sounds.
The temperature that triggers the warning light and buzzer varies with engine type and is pro- grammed into the system at the factory. If the temperature continues to rise to critical levels, the engine shutdown light comes on, and the engine will shut down (if equipped with the shutdown feature). NOTE: If the lockout feature activates to let the starter cool, the starter lockout warning light ( Fig. 2.23 ) will be on for the two-minute cooling period. If the lockout feature activates for any other reason, the light will glow only if the starter button is pressed within two seconds of the lockout occurring, and it will be on only as long as the button is pressed.
If the coolant level drops below a sensor in the cooling system, the low water level light comes on. After 5 seconds, a buzzer sounds, and after 30 seconds the system shuts down the engine (if equipped with the shutdown feature). The system features a speed governor for maximum vehicle speed control. The governor can be set anywhere between 45 and 85 mph (70 and 140 km/h), and controls vehicle speed by cutting fuel delivery pressure when the pre- determined speed is reached. If this system is malfunctioning, the lightbar overspeed light ( Fig. 2.23 ) will flash on for ten seconds each time that the engine is started.
If the oil pressure drops below a preset level, the low oil pressure light comes on and a warning buzzer sounds. If the oil pressure drops to a preset critical level, the engine shut- down light comes on, and the engine will shut down (if equipped with the shutdown feature). 2.18