Servo Vacuum Test; Speed Control Switch Test - Chrysler Stratus RHD 1997 Interactive Electronic Service Manual

8H - 8 VEHICLE SPEED CONTROL SYSTEM
DIAGNOSIS AND TESTING (Continued)
OVERSHOOT/UNDERSHOOT ON SPEED CONTROL
SET
If the operator repeatedly presses and releases the
set button with their foot off of the accelerator (a "lift
foot set" to begin speed control operation), the vehicle
may accelerate and exceed the desired set speed by
up to 5 MPH (8 km/h) and then decelerate to less
than the desired set speed before finally achieving
the desired set speed.
The Speed Control has an adaptive strategy that
compensates for vehicle-to-vehicle variations in speed
control cable lengths. When the speed control is set
with the vehicle operators foot off of the accelerator
pedal, the speed control thinks there is excessive
speed control cable slack and adapts. If the lift foot
sets are continually used, the speed control over-
shoot/undershoot condition will develop.
To "unlearn" the overshoot/undershoot condition,
the vehicle operator has to press and release the set
button while maintaining the desired set speed with
the accelerator pedal (not decelerating or accelerat-
ing), and then turn the cruise control switch to the
OFF position (or press the CANCEL button if
equipped) after waiting 10 seconds. This procedure
must be performed approximately 10–15 times to
completely unlearn the overshoot/undershoot condi-
tion.

SERVO VACUUM TEST

(1) Turn ignition switch to the ON position with-
out starting engine. Activate speed control ON
switch.
(2) Disconnect the four-way electrical connector
and the vacuum harness at the servo (Fig. 5).
(3) Connect a jumper wire from Pin 3 of the servo
to Pin 3 of the wire connector.
(4) Ground Pins 2 and 4 in the servo. Do not con-
nect pin 1.
(5) Connect a hand held vacuum pump to the vac-
uum nipple and apply 10 - 15 inches of vacuum.
(6) If servo pulls cables, replace servo.
(7) Ground Pin 1 on servo.
(8) Check that the throttle cable pulls in and holds
as long as the vacuum pump is connected. After one
minute, check if cable is still holding. If cable does
not hold replace the servo.
(9) Disconnect jumper from pin 3. Cable should
return to rest position. If not, replace servo.
CONNECTORS FROM TERMINAL END SHOWN PIN 1 PIN 3 PIN 2 PIN 1 PIN 4 PIN 2 PIN 3 PIN 4
(10) Connect 4 way electrical connector and vac-
uum harness to servo.
Fig. 5 Servo Harness Connector

SPEED CONTROL SWITCH TEST

(1) Remove the ON/OFF and CANCEL speed con-
trol switch assembly and disconnect the two-way con-
nector (Fig. 6).
Fig. 6 Speed Control Switch
(2) Using an ohmmeter, touch a lead to each pin.
The meter should read 22,848 to 22,351 ohms. Press
the CANCEL button, the ohmmeter should read 0 to
0.5 ohms. Press the ON/OFF button, the ohmmeter
should read 668 to 653 ohms. If the resistance does
not fall within these values replace the switch.
(3) Remove the SET/RESUME
switch assembly and disconnect the two-way connec-
tor.
JA
speed control