Disconnect Axle/Shift Motor Diagnosis; Two-Wheel Drive Operation Diagnosis - Dodge D150 1990 Service Manual

2 - 26 FRONT SUSPENSION
DISCONNECT AXLE/SHIFT MOTOR DIAGNOSIS
TWO-WHEEL DRIVE O P E R A T I O N D I A G N O S I S
FOUR-WHEEL DRIVE
INDICATOR LIGHT WILL
NOT G O O U T W H E N
TRANSFER C A S E SELECTOR
IS MOVED FROM 4H TO
2H P O S I T I O N .
RAISE VEHICLE S O ALL
FOUR W H E E L S ARE
FREE TO ROTATE.
INSPECT INDICATOR
SWITCH A N D W I R I N G O N
SHIFT MOTOR H O U S I N G
FOR DAMAGE A N D
SHORT-CIRCUIT.
REPAIR A S NECESSARY.
Y E S '
START E N G I N E DEPRESS BRAKE
PEDAL. PLACE TRANSFER
C A S E SELECTOR IN 2H POSITION
A N D T R A N S M I S S I O N IN
DRIVE (AUTOMATIC) OR FIRST
G E A R (MANUAL). E A S E O F F FROM
BRAKE A N D LET W H E E L S ROTATE
SLOWLY.
TEST COMPLETE
FRONT DRIVE
SHAFT D O E S
NOT ROTATE.
FRONT DRIVE
SHAFT ROTATES.
FOUR-WHEEL DRIVE
INDICATOR LIGHT
REMAINS O N .
INSPECT TRANSFER
CASE LINKAGE.
PLACE T R A N S M I S S I O N
IN NEUTRAL.
TEST FOR VACUUM
IN VACUUM H O S E
THAT C O N N E C T S TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM S H O U L D BE
B E T W E E N 10-20 IN. HG.)
•
TEST FOR VACUUM
IN VACUUM H O S E
THAT C O N N E C T S TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM S H O U L D BE
B E T W E E N 10-20 IN. HG.)
D I S C O N N E C T T H E
S H I F T M O T O R V A C U U M
H O S E S .
TEST FOR VACUUM
IN VACUUM H O S E
THAT C O N N E C T S TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM S H O U L D BE
B E T W E E N 10-20 IN. HG.)
D I S C O N N E C T T H E
S H I F T M O T O R V A C U U M
H O S E S .
TEST FOR VACUUM
IN VACUUM H O S E
THAT C O N N E C T S TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM S H O U L D BE
B E T W E E N 10-20 IN. HG.)
CHECK TRANSFER
C A S E . REPAIR
AS NECESSARY.
N O VACUUM
OR LOW VACUUM.
INSPECT INTAKE M A N I F O L D
VACUUM SUPPLY H O S E C O N N E C T I O N ,
TRANSFER C A S E VACUUM SWITCH
C O N N E C T I O N , VACUUM RESERVOIR,
A N D SHIFT SYSTEM VACUUM H O S E S
FOR PROPER C O N N E C T I O N , RESTRICTION,
AIR LEAKS, A N D DAMAGE. REPAIR OR REPLACE
AS NECESSARY.
VACUUM O K
STOP E N G I N E
CONNECT A VACUUM
PUMP TO THE INBOARD
SHIFT MOTOR PORT.
APPLY 15 IN. HG
VACUUM AND ROTATE
LEFT WHEEL.
FRONT AXLE
D I S C O N N E C T S .
FRONT AXLE
D O E S NOT
DISCONNECT.
INSPECT VACUUM
H O S E S FOR AIR LEAKS, K I N K S , ETC.
REPAIR AS NECESSARY.
REMOVE SHIFT MOTOR
H O U S I N G COVER. C O N N E C T
VACUUM PUMP TO
SHIFT MOTOR PORT.
REPLACE SHIFT MOTOR
IF ARMATURE D O E S
NOT MOVE IN A N D OUT
FREELY.
FRONT AXLE
WILL NOT DISCONNECT.
J9002-95
REMOVE SHIFT MOTOR H O U S I N G
C O V E R . INSPECT SHIFT FORK,
COLLAR, A N D AXLE SHAFTS.
REPAIR OR REPLACE A S
NECESSARY.