RAM 2500 Truck 2WD L6-359 5.9L DSL Turbo VIN D FI (1997)
Vacuum Sensor / Switch HVAC: Description and Operation
CIRCUIT OPERATION
The vacuum sensor is used on the diesel engine only. Power for the sensor is supplied on circuit A20. This circuit is HOT in the RUN position
only and protected by a 20 amp fuse located in cavity 14 of the fuse block. Ground for the switch is supplied on circuit Z1.
Circuit Z1 connects to the vacuum sensor and supplies a ground path for circuit G9. If there is a problem in the system, the sensor grounds circuit
G9 and the red brake warning lamp in the instrument cluster is illuminated.
