Chrysler 1991 Service Manual Supplement page 22

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SPEED CONTROL SYSTEM 8H - 5
A VACUUM
y-
HOSE
J918H-25
Fig. 2 Servo And Harness Connector
SINGLE BOARD
ENGINE CONTROLLER
SPEED CONTROL
SERVO
J918H-29
Fig. 3 Engine Controller and Connector Location
(5) Touch the positive lead of the voltmeter to the
terminal in cavity number 48. With the speed control
switch in the OFF position, the voltmeter should
read 0 volts. With the switch in the ON position, the
voltmeter should read battery voltage. Pressing the
SET button should cause the voltmeter to change
from battery voltage to 0 volts for as long as the
switch is held. I f not, perform the speed control
switch test. If the switch is not at fault, then check
the main harness and repair as necessary.
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Fig. 4 Engine Controller 60-Way Connector Shown
from Terminal End
(6) Touch the positive lead of the voltmeter to the
terminal in cavity number 50. The voltmeter should
read 0 volts with the speed control switch in either
the OFF or ON position. With switch in either RE-
SUME or SET position, the voltmeter should read
battery voltage. I f not, perform the speed control
switch test. If the switch is not at fault, then check
the main harness and repair as necessary.
(7) Touch the positive lead of the voltmeter to the
terminal in cavity number 49. The voltmeter should
read 0 volts with the switch in the OFF position.
With the switch in the ON position, the voltmeter
should read battery voltage. The voltmeter will con-
tinue to read battery voltage when either the SET or
RESUME switch is pressed. If not, perform the speed
control switch test. If the switch is not at fault, then
check the main harness and repair as necessary .
(8) Using an ohmmeter, connect one lead to a good
body ground and touch the other lead to the terminal
in cavity number 29. With the brake pedal released,
the meter should show continuity. When the pedal is
depressed, the meter should show open circuit.
SPEED CONTROL SWITCH TEST
To check the switch, remove the switch from its
mounting position. Use an ohmmeter and refer to the
Switch Continuity Chart to determine i f continuity is
correct. If there is no continuity at any one of the
switch positions, replace the switch.
STOP LAMP SPEED CONTROL SWITCH TEST
(1) Disconnect the connector at the stop lamp
switch. Using an ohmmeter, continuity may be
checked at the switch side of the connector as follows
(Fig. 5):
(a) With the brake pedal released, there should
be no resistance between:
• the black (BK) and white with red tracer (WT/PK)
wires
• the yellow with red tracer (YL/RD)
• dark blue with red tracer (DB/RD) wires
• pink (PK) and white (WT) wires.