Servo Vacuum Test; Speed Control Switch Test; Stop Lamp Switch Test - Chrysler 1998 Voyager Service Manual

8H - 6 VEHICLE SPEED CONTROL SYSTEM
DIAGNOSIS AND TESTING (Continued)

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. 3).
(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 cable, 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.
(10) Connect 4 way electrical connector and vac-
uum harness to servo.
Fig. 3 Servo Harness Connector

SPEED CONTROL SWITCH TEST

Refer to the appropriate Powertrain Diagnostic
Manual for switch test valves.

STOP LAMP SWITCH TEST

(1) Remove the stop lamp switch refer to Stop
Switch Removal/Installation in this section. Discon-
nect connector from stop lamp switch (Fig. 4). Using
an ohmmeter, switch continuity may be checked as
follows:
(2) With switch plunger released, there should be
continuity between Pin 5 and Pin 6.
Fig. 4 Stop Lamp Wiring
(3) With switch plunger depressed, there should be
continuity:
• Between Pin 1 and Pin 2.
• Between Pin 3 and Pin 4.
(4) If the above results are not obtained, the stop
lamp switch is defective or out of adjustment.
(5) Stop lamp switch adjustment is detailed in
Group 5, Brakes.
ELECTRICAL TESTS AT POWERTRAIN CONTROL
MODULE
(1) Unplug the GRAY 40-way connector from the
Powertrain Control Module (PCM), (Fig. 5).
Fig. 5 Powertrain Control Module Location
(2) Remove both steering wheel speed control
switches and disconnect the wire connectors.
NS