Chrysler RAM TRUCK 2500 1994 Service Manual page 85

2 - 28 FRONT SUSPENSION AND AXLE
DISCONNECT AXLE/SHIFT MOTOR DIAGNOSIS
T W O - W H E E L D R I V E 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 GO OUT WHEN
TRANSFER CASE SELECTOR
IS MOVED FROM 4H TO
2H POSITION.
RAISE VEHICLE SO ALL
FOUR WHEELS ARE
FREE TO ROTATE.
INSPECT INDICATOR
SWITCH AND WIRING ON
SHIFT MOTOR HOUSING
FOR DAMAGE AND
SHORT-CIRCUIT.
REPAIR AS NECESSARY.
YES i
START ENGINE DEPRESS BRAKE
PEDAL. PLACE TRANSFER
CASE SELECTOR IN 2H POSITION
AND TRANSMISSION IN
DRIVE (AUTOMATIC) OR FIRST
GEAR (MANUAL). EASE OFF FROM
BRAKE AND LET WHEELS ROTATE
SLOWLY.
TEST COMPLETE
FRONT DRIVE
SHAFT DOES
NOT ROTATE.
FRONT DRIVE
SHAFT ROTATES.
FOUR-WHEEL DRIVE
INDICATOR LIGHT
REMAINS ON.
INSPECT TRANSFER
CASE LINKAGE
PLACE TRANSMISSION
IN NEUTRAL
TEST FOR VACUUM
IN VACUUM HOSE
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
BETWEEN 10-20 IN. HG.)
•
TEST FOR VACUUM
IN VACUUM HOSE
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
BETWEEN 10-20 IN. HG.)
DICONNECTTHE
SHIFT MOTOR VACUUM
HOSES.
TEST FOR VACUUM
IN VACUUM HOSE
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
BETWEEN 10-20 IN. HG.)
DICONNECTTHE
SHIFT MOTOR VACUUM
HOSES.
TEST FOR VACUUM
IN VACUUM HOSE
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
BETWEEN 10-20 IN. HG.)
CHECK TRANSFER
CASE. REPAIR
AS NECESSARY.
NO VACUUM
OR LOW VACUUM.
INSPECT INTAKE MANIFOLD
VACUUM SUPPLY HOSE CONNECTION,
TRANSFER CASE VACUUM SWITCH
CONNECTION, VACUUM RESERVOIR,
AND SHIFT SYSTEM VACUUM HOSES
FOR PROPER CONNECTION, RESTRICTION,
AIR LEAKS, AND DAMAGE. REPAIR OR REPLACE
AS NECESSARY.
VACUUM OK
= 3 = ^
STOP ENGINE
CONNECT A VACUUM
PUMP TO THE INBOARD
SHIFT MOTOR PORT.
APPLY 15 IN. HG
VACUUM AND ROTATE
RIGHT WHEEL.
FRONT AXLE
DISCONNECTS.
INSPECT VACUUM
HOSES FOR AIR LEAKS, KINKS, ETC.
REPAIR AS NECESSARY.
FRONT AXL*
DOES NOT
DISCONNECT.
REMOVE SHIFT MOTOR
HOUSING COVER. CONNECT
VACUUM PUMP TO
SHIFT MOTOR PORT.
REPLACE SHIFT MOTOR
IF ARMATURE DOES
NOT MOVE IN AND OUT
FREELY.
FRONT AXLE
WILL NOT DISCONNECT.
J9002-95
REMOVE SHIFT MOTOR HOUSING
COVER. INSPECT SHIFT FORK,
COLLAR, AND AXLE SHAFTS.
REPAIR OR REPLACE AS
NECESSARY.