Chrysler RAM TRUCK 2500 1994 Service Manual page 453

8H - 4 WEH1GLE SPEED CONTROL SYSTEM
DIESEL
E N G I N E
WARNINGS THE USE OF THE SPEED CONTROL
IS NOT RECOMMENDED WHEN D R I V I N G
CONDITIONS DO N O T PERMIT MAINTAINING
A CONSTANT SPEED, SUCH AS HEAVY
TRAFFIC OR ON ROADS THAT ARE WINDING,
ICY, SNOW COVERED OR SUPPERY.
START ENGINE
ACCELERATE VEHICLE
T O DESIRED S P E E D
i
SPEED CONTROL
ENGAGES WHEN
ENGINE IS STARTED
PUSH ON/CRUISE
BUTTON TO "ON"
POSITION
SPEED CONTROL
ENGAGES WITHOUT
PUSHING THE
"SET/DECEL" BUTTON
X
PUSH AND RELEASE
"SET/DECEL" BUTTON
FAULTY ELECTRICAL CIRCUIT*
DEFECTIVE SERVO
I
REMOVE FOOT FROM
ACCELERATOR. SPEED
SHOULD BE CONTROLLED
I
NO SPEED CONTROL
WHEN SET/DECEL BUTTON
IS PRESSED AND RELEASED
I
HUNTING SURGE OR
SPEED VARIATIONS
AT LOW SPEEDS
FUSE BLOWN
I
TORQUE CONVERTER
CLUTCH ROUGHNESS
"INSUFFICIENT
VACUUM AT SERVO
X
AMPLIFICATION OF
ENGINE SURGE
SPEED CONTROL
THROTTLE CABLE
DISCONNECTED
X
DEFECTIVE SERVO
IMPROPER STOP LAMP
SWITCH ADJUSTMENT
X
X
DEFECTIVE CABLE
FAULTY ELECTRICAL
CIRCUIT*
I
I
I
EXCESSIVE SAG
O N HILLS OR
IN TRAILER TOWING
ENGINE
PERFORMANCE
X
••INSUFFICIENT
VACUUM AT SERVO
X
EXCESSIVE LOAD MAY
REQUIRE MANUAL
ASSISTANCE ON HILLS
FAULTY
ELECTRICAL CIRCUIT*
DEFECTIVE SERVO
SPEED SETTING AFTER
LOCK-IN, TOO HIGH
OR TOO LOW
"INSUFFICIENT
VACUUM AT SERVO
X
DEFECTIVE SERVO
t
DEFECTIVE CABLE
**REFER TO GROUP 5 - BRAKES
FOR VACUUM PUMP DIAGNOSIS.
DEFECTIVE
POWERTRAIN
CONTROL MODULE
DEFECTIVE SERVO
X
TEST AND ADJUSTMENTS ARE DESCRIBED
IN APPROPRIATE SECTION OF SERVICE
MANUAL
DEFECTIVE ENGINE
SPEED SENSOR
J948H-28