Vacuum reservoir. Vehicle speed input
DESCRIPTION The vacuum reservoir is a plastic storage tank connected
to an engine vacuum source by vacuum lines. OPERATION The vacuum reservoir is used to supply the vacuum
needed to maintain proper speed control operation
when engine vacuum drops, such as in climbing
a grade while driving. A one-way check valve is used
in the vacuum line between the reservoir and the
vacuum source. This check valve is used to trap
engine vacuum in the reservoir. On certain vehicle
applications, this reservoir is shared with the heating/
air-conditioning system. The vacuum reservoir
cannot be repaired and must be replaced if faulty. OPERATION The Vehicle Speed Sensor (VSS) is no longer used
for any Dodge Truck.
Vehicle speed and distance covered are measured
by the Rear Wheel Speed Sensor. The sensor is
mounted to the rear axle. A signal is sent from this
sensor to the Controller Antilock Brake (CAB) computer.
A signal is then sent from the CAB to the Powertrain
Control Module (PCM) to determine vehicle
speed and distance covered. The PCM will then
determine strategies for speed control system operation.Vacuum reservoir
Vehicle speed input
Dodge Durango (DN) 1998-2003 Service Manual
- Lubrication and Maintenance
- Suspension
- Differential and Driveline
- Brakes
- Cooling System
- Battery
- Starting Systems
- Charging System
- Ignition System
- Instrument Panel Systems
- Audio Systems
- Horn Systems
- Speed Control System
- Turn Signal and Hazard Warning Systems
- Wiper and Washer Systems
- Lamps
- Passive Restraint Systems
- Electrically Heated Systems
- Power Distribution System
- Power Lock Systems
- Vehicle Theft/Security Systems
- Power Seat System
- Power Window Systems
- Power Mirror Systems
- Chime/Buzzer Warning Systems
- Overhead Console Systems
- Engine
- Exhaust System
- Frame and Bumpers
- Fuel System
- Steering
- Transmission and Transfer Case
- Tires and Wheels
- Body
- Heating and Air Conditioning
- Emission Control Systems
- Introduction
Categories
