Dodge Ram Truck 1500-2500-3500. Manual — part 574
RESERVOIR-VACUUM
DESCRIPTION
The vacuum reservoir is a plastic storage tank connected to an engine vacuum source by vacuum lines. A vacuum
reservoir is not used with diesel engines or the 5.7L gas powered engine.
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.
DIAGNOSIS AND TESTING
VACUUM RESERVOIR
1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose.
2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury.
3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks.
Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for
poor engine performance and repair as necessary.
4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reser-
voir, refer to Vacuum Reservoir Removal/Installation in this group. Disconnect vacuum line at reservoir and con-
nect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If
vacuum is being lost, replace reservoir.
5. Verify operation of one-way check valve and check it for leaks. Certain models may be equipped with 2
check-valves.
a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine
vacuum source. Disconnect vacuum hoses (lines) at each end of valve.
b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not
bleed off. If vacuum is being lost, replace one-way check valve.
c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum
should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite
end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has
ruptured. Replace valve.
8P - 10
SPEED CONTROL
DR/DH
REMOVAL
The vacuum reservoir (1) is located in the engine
compartment under the fresh air cowl grill panel.
1. Remove wiper blades and arms. Refer to Wiper
Arm Removal / Installation in the Wipers / Washers
section.
2. Remove fresh air cowl grill. Refer to Cowl Grill
Removal / Installation.
3. Disconnect vacuum line (2) at reservoir.
4. Remove 2 reservoir mounting nuts (3).
5. Remove reservoir from cowl.
INSTALLATION
1. Position reservoir onto 2 weld studs.
2. Install 2 mounting nuts and tighten. Refer to torque specifications.
3. Connect vacuum line to reservoir fitting.
4. Install cowl grill. Refer to Cowl Grill Removal / Installation.
5. Install wiper arms / blades. Refer to Wiper Arm Removal / Installation.
DR/DH
SPEED CONTROL
8P - 11
VEHICLE THEFT SECURITY
TABLE OF CONTENTS
page
page
VEHICLE THEFT SECURITY - ELECTRICAL
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
VEHICLE THEFT SECURITY - SERVICE
INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 53
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
VEHICLE THEFT SECURITY - ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
. . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . 16
CHECK (CRC) FAILURE . . . . . . . . . . . . . . . . . 18
FAILURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
. . . . . . . . . . . . . . 30
*DRIVER DOOR DOES NOT TRIP VTSS
ALARM IS TRIPPED . . . . . . . . . . . . . . . . . . . . 38
*HORN FAILS TO SOUND WHEN ALARM IS
TRIPPED . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
*LEFT REAR DOOR DOES NOT TRIP VTSS
(4 DOOR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
VTSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
*RIGHT REAR DOOR DOES NOT TRIP
VTSS (4 DOOR) . . . . . . . . . . . . . . . . . . . . . . . 44
. . . . . . . . . . . . . . 51
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
DR/DH
VEHICLE THEFT SECURITY
8Q - 1
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