Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 1998-99 98DN_8H
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>> Download 98DN_8H documenatation <<Text preview - extract from the documentDN SPEED CONTROL SYSTEM 8H - 1
SPEED CONTROL SYSTEM
CONTENTS
page page
GENERAL INFORMATION OVERSHOOT/UNDERSHOOT FOLLOWING
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 SPEED CONTROL SET . . . . . . . . . . . . . . . . . . . 4
DESCRIPTION AND OPERATION ROAD TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
POWERTRAIN CONTROL MODULE . . . . . . . . . . 2 SPEED CONTROL SERVO . . . . . . . . . . . . . . . . . . 3
SERVO CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SPEED CONTROL SWITCHES . . . . . . . . . . . . . . 3
SPEED CONTROL SERVO . . . . . . . . . . . . . . . . . . 1 STOP LAMP SWITCH . . . . . . . . . . . . . . . . . . . . . 3
SPEED CONTROL SOLENOID CIRCUITS . . . . . . 1 VACUUM SUPPLY TEST . . . . . . . . . . . . . . . . . . . 3
SPEED CONTROL SWITCHES . . . . . . . . . . . . . . 1 REMOVAL AND INSTALLATION
STOP LAMP SWITCH . . . . . . . . . . . . . . . . . . . . . 2 SERVO CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . 5
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . 2 SPEED CONTROL SERVO . . . . . . . . . . . . . . . . . . 4
VEHICLE SPEED INPUT . . . . . . . . . . . . . . . . . . . 2 SPEED CONTROL SWITCHES . . . . . . . . . . . . . . 5
DIAGNOSIS AND TESTING STOP LAMP SWITCH . . . . . . . . . . . . . . . . . . . . . 5
ON-BOARD DIAGNOSTIC TEST FOR SPEED VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . 6
CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . 2 SPECIFICATIONS
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . . 7
GENERAL INFORMATION vent solenoid and "duty-cycles" the vacuum solenoid
to open the throttle and bring the vehicle up to tar-
INTRODUCTION get speed. When the vehicle is at target speed, it will
The vehicle speed control system is electronically actuate the vent solenoid with the vacuum solenoid
controlled and vacuum operated. The system is de-activated to maintain the vehicle at target speed.
designed to operate between approximately 35 and When the vehicle is above target speed, the PCM will
85 mph (56 and 137 km/h). Following are general "duty-cycle" the vent solenoid with the vacuum sole-
descriptions of the major components in the speed noid still de-activated to close the throttle to return
control system. For diagnosis of the entire speed con- to target speed.
trol system, refer to the appropriate Powertrain
Diagnostic Procedures service manual and the DRB SPEED CONTROL SWITCHES
scan tool. Refer to Group 8W, Wiring Diagrams for Two separate speed control switch modules are
complete circuit descriptions and wiring diagrams. mounted on the steering wheel to the left and right
side of the driver's airbag module. Within the two
switch modules, five momentary contact switches,
DESCRIPTION AND OPERATION supporting seven different speed control functions
are used. The outputs from these switches are fil-
SPEED CONTROL SERVO tered into one input. The Powertrain Control Module
The servo unit consists of a solenoid valve body, a (PCM) determines which output has been applied
vacuum servo and the mounting bracket. The Power- through resistive multiplexing. The input circuit
train Control Module (PCM) controls the solenoid voltage is measured by the PCM to determine which
valve body. The solenoid valve body controls the switch function has been selected.
application and release of vacuum to the diaphragm A speed control indicator lamp, located on the
of the vacuum servo. A cable connects the servo with instrument panel cluster is energized by the PCM via
the throttle linkage. The servo unit cannot be the CCD Bus. This occurs when speed control system
repaired and is serviced only as a complete assembly. power has been turned ON, and the engine is run-
ning.
SPEED CONTROL SOLENOID CIRCUITS The two switch modules are labeled: ON/OFF, SET,
When all of the speed control parameters are met, RESUME/ACCEL, CANCEL and COAST. Refer to
and the SET button is pressed, the PCM actuates the the owner's manual for more information on speed
8H - 2 SPEED CONTROL SYSTEM DN
DESCRIPTION AND OPERATION (Continued)
control switch functions and setting procedures. The ertrain Control Module (PCM) to determine vehicle
individual switches cannot be repaired. If one indi- speed and distance covered. The PCM will then
vidual switch fails, the switch module must be determine strategies for speed control system opera-
replaced. tion.
STOP LAMP SWITCH
Vehicles equipped with the speed control option use DIAGNOSIS AND TESTING
a dual function stop lamp switch. The switch is
mounted on the brake pedal mounting bracket under ROAD TEST
the instrument panel. The PCM monitors the state of Perform a vehicle road test to verify reports of
the dual function stop lamp switch. Refer to Group 5, speed control system malfunction. The road test
Brakes for more information on stop lamp switch ser- should include attention to the speedometer. Speed-
vice and adjustment procedures. ometer operation should be smooth and without flut-
ter at all speeds.
SERVO CABLE Flutter in the speedometer indicates a problem
The speed control servo cable is connected between which might cause surging in the speed control sys-
the speed control vacuum servo diaphragm and the tem. The cause of any speedometer problems should
throttle body control linkage. This cable causes the be corrected before proceeding. Refer to Group 8E,
throttle control linkage to open or close the throttle Instrument Panel and Gauges for speedometer diag-
valve in response to movement of the vacuum servo nosis.
diaphragm. If a road test verifies a system problem and the
speedometer operates properly, check for:
POWERTRAIN CONTROL MODULE
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