Table of Contents
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SPEED CONTROL SYSTEM
8H - 5
T E S T P R O C E D U R E S
INDEX
Page
Checking For Fault Code
5
Electrical Tests At Engine Controller . . . . . . . . . . . . 6
Electrical Tests At Servo
, . 5
Inoperative System
5
Road Test
5
Page
Speed Control Cable Attachment
7
Speed Control Switch (Turn Signal Lever) Test
. . . 7
Speed Control System Electrical Tests
5
Stop Lamp Speed Control Switch Test
6
Vacuum Supply Test
7
ROAD TEST
Road test vehicle to verify reports o f speed control
system malfunction. The road test should include at-
t e n t i o n to t h e speedometer. Speedometer operation
should be smooth a n d w i t h o u t f l u t t e r a t a l l speeds.
F l u t t e r i n t h e speedometer indicates a problem
w h i c h m i g h t cause s u r g i n g i n the speed control sys-
tem. The cause
o f a n y speedometer
deficiencies
should be corrected before proceeding.
INOPERATIVE SYSTEM
I f road test verifies a report on an inoperative sys-
t e m and of satisfactory speedometer operation, an i n -
spection should be made
for loose electrical a n d
vacuum connections a t t h e servo.
Check for correct i n s t a l l a t i o n of t h e vacuum check
valve i n the hose f r o m servo t o v a c u u m source. T h e
w o r d V A C on t h e valve m u s t point t o w a r d the vac-
u u m source.
Corrosion should be removed from electrical t e r m i -
nals a n d a l i g h t coating o f Mopar
Multi-Purpose
Grease, or equivalent, applied.
Inspection should also be made to verify t h a t b o t h
ends o f the speed control cable are securely attached.
CHECKING FOR FAULT CODE
(1) When t r y i n g t o verify a speed control system
electronic m a l f u n c t i o n , one o f two s i m i l a r methods
may be used. I f a D R B I I is available, p l u g i n t o t h e
diagnostic connector i n the engine compartment and
verify t h a t either a F a u l t Code 34 (S/C SERVO SO-
L E N O I D S ) or F a u l t Code 15 ( V E H I C L E SPEED SIG-
N A L ) is indicated.
Y o u c a n also r e f e r t o t h e a p p r o p r i a t e P o w e r -
t r a i n D i a g n o s t i c P r o c e d u r e s M a n u a l .
I f the D R B I I is not available, the F a u l t Code may
be determined w i t h the f o l l o w i n g method:
(a) W i t h k e y inserted i n i g n i t i o n switch, cycle
switch to O N position three times. O n t h i r d cycle,
leave switch i n O N position.
(b) After switch has been cycled three times,
observe C H E C K E N G I N E indicator on i n s t r u m e n t
cluster. I f a F a u l t Code is present, indicator w i l l
flash (blink) i n a series w h i c h w i l l show w h i c h
F a u l t Code is t h e problem (i.e. three flashes i n
r a p i d succession, a slight pause, t h e n four flashes
i n r a p i d succession would indicate F a u l t Code 34).
(2) I f a F a u l t Code 34 is observed, determine t h e
source o f the problem by performing the tests i n the
sections E l e c t r i c a l Tests a t Servo and Electrical Tests
at E n g i n e Controller.
I f a f a u l t code 15 is observed, perform the test for a
faulty distance sensor.
(3) Correct a n y problems found w h e n performing
these tests a n d recheck for F a u l t Code i f changes
were made.
DISTANCE
SENSOR
TEST
For t e s t i n g o f the distance sensor and related com-
ponents refer t o the Vehicle Diagnostics Test Proce-
dure M a n u a l .
SPEED CONTROL SYSTEM ELECTRICAL TESTS
Electronic speed control systems may be tested us-
i n g t w o different methods. One involves use o f a
D R B I I . I f t h i s test method is desired, please refer t o
the Vehicle Diagnostic Test Procedures booklet.
The other test method uses a voltmeter. The volt-
meter method is described i n the following tests.
I f any i n f o r m a t i o n is needed concerning w i r i n g , re-
fer to Group 8 W - W i r i n g Diagrams.
CAUTION: When test probing for voltage or conti-
nuity at electrical connectors, care must be taken
not to damage connector, terminals, or seals. If
these components are damaged, intermittent or
complete system failure may occur.
ELECTRICAL TESTS AT SERVO
(1) T u r n i g n i t i o n switch to the O N position. W i t h
the speed control switch i n the O N position, set up a
voltmeter t o read battery voltage a n d connect t h e
negative lead t o a good chassis ground.
(2) Disconnect t h e 4-way connector going to t h e
servo. The blue w i r e w i t h the red tracer o f the m a i n
harness 4-way connector should read approximately
battery voltage. I f not, check for loose connections,
brake switch adjustment or, repair the m a i n harness
as necessary.
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