ISUZU TROOPER 1998 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±90
Chart 2The 4WD mode is not active.
Function of circuitÐ
Fail conditionThe rear wheels spin in the TOD mode, so the driving torque is not transmitted to the
front wheels. The indicator lamps will not show the 4L and TOD status.
D04RW057

4B2±91 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
1Is the trouble code 31 or 26 recorded?Examine the
trouble based on
ªDiagnosis from
Trouble Codesº.
Go to Step 7
Go to Step 2
2Is any of the trouble codes 28, 32 and 33 recorded?Examine the
trouble based on
ªDiagnosis from
Trouble Codesº.
Go to Step 7
Go to Step 3
3When the transfer lever is in the specified position, do the TOD
indicator lamps show the correct status?
Go to Step 4
Examine the
trouble based on
ªTrouble
Diagnosis
Depending on
The Status of
TOD Indicatorº.
Go to Step 7
4Shift the transfer lever to the 4L position, fully turn the steering to
the left (or right) end, and start the creep run. Does the tight
corner braking occur?
Go to Step 5
Repair the
transfer
assembly.
Go to Step 7
51. Shift the transfer lever to the high (TOD) position.
2. Turn on the starter switch.
Does the voltage between terminals 4 and 20 indicate at least
0.1V while the throttle is completely open?
Go to Step 6
The ECU has
failed. Replace
the ECU.
Go to Step 7
6Does the voltage between terminals 4 and 20 indicate at least 3V
while the throttle is completely closed?The TOD clutch
is worn. Repair
the transfer
assembly.
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
7Check that all the parts are mounted.
Is this step complete?Repeat the
ªDiagnosis Flowº.
Return to Step 7

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±92
Chart 3The shift on the fly system generates gear noises.
(The fuel economy is bad in the 2H mode.)
Function of circuitÐ
Fail conditionWhen the vehicle is run in the 2H mode, the shift on the fly system generates gear
noises or the front wheel gears are engaged to generate a shock.
D04RW055

4B2±93 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
1Do the indicator lamps show the correct status?
Go to Step 2
Examine the
trouble based on
ªDiagnosis from
Trouble Codesº.
Go to Step 2
2Is any of the trouble codes 28, 32 and 33 recorded?Examine the
trouble based on
ªDiagnosis from
Trouble Codesº.
Go to Step 6
Go to Step 3
3Turn on the starter switch.
Is the battery voltage observed between terminals 1 and 20?
Go to Step 4Go to Step 5
4When the 4WD SW is select to the 2WD position, are the front
axle gears correctly disengaged (and when the left front tire is
jacked up and turned, is the front propeller shaft standstill)?The phenomenon
is not
reproduced.
Refer to
ªTroubles
intermittently
observedº.
Go to Step 6
The shift on the
fly system is
failed (refer to
Section 4C ªDrive
Shaft Systemº.
Go to Step 6
5Does the battery voltage maintain the correct level?
Repair the battery
circuit.
Go to Step 6
Repair the battery
and charging
system.
Go to Step 6
6Check that all the parts are mounted.
Is this step complete?Repeat the
ªDiagnosis Flowº.
Return to Step 6

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±94
Chart 4The braking distance gets long even when the ABS is active.
Function of circuitÐ
Fail conditionEnough deceleration is not obtained and the braking distance gets long even when the
ABS is active in the 2H mode.
D04RW055

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–95
Step Action Yes No
1 Are the brake and ABS systems healthy?
Go to Step 2Repair the
brake and ABS.
Go to Step 4
2 Turn on the star ter switch.
Is the battery voltage observed between terminals 1 and 20?
Go to Step 3Repair the
battery system.
Go to Step 4
3 1. Select the 4WD SW to the 2WD position.
2. The voltage between terminals 3 and 19 range between 7.5
and 16V (0.24 seconds make a cycle)
Does the voltage within the range specified?Examine the
trouble based
on “Diagnosis
from Trouble
Codes".
Go to Step 4The ECU has
failed. Replace
the ECU.
Go to Step 4
4 Check that all the par ts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow". Return to Step 4

4C±1 DRIVE SHAFT SYSTEM
DRIVELINE/AXLE
DRIVE SHAFT SYSTEM
CONTENTS
Service Precaution 4C±2. . . . . . . . . . . . . . . . . . . . . .
General Description 4C±2. . . . . . . . . . . . . . . . . . . . .
Diagnosis 4C±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Axle Shaft 4C±4. . . . . . . . . . . . . . . . . . . . . . . . .
Rear Axle Shaft and Associated Parts 4C±4. . . .
Removal 4C±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 4C±5. . . . . . . . . . . . . . . . . .
Oil Seal Replacement 4C±6. . . . . . . . . . . . . . . . . .
Installation 4C±6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 4C±8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Hub and Disc (with Shift on the Fly) 4C±9. .
Disassembled View 4C±9. . . . . . . . . . . . . . . . . . . .
Disassembly 4C±9. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 4C±10. . . . . . . . . . . . . . . . . .
Reassembly 4C±11. . . . . . . . . . . . . . . . . . . . . . . . . .
Front Hub and Disc with Manual Locking Hub 4C±14
Disassembled View 4C±14. . . . . . . . . . . . . . . . . . . .
Disassembly 4C±14. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 4C±16. . . . . . . . . . . . . . . . . .
Reassembly 4C±16. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications 4C±20. . . . . . . . . . . . .
Special Tools 4C±21. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Drive Shaft Joint 4C±22. . . . . . . . . . . . . . . . . . .
Front Drive Shaft Joints Replacement 4C±22. . . .
Front Axle Drive Shaft 4C±23. . . . . . . . . . . . . . . . . . .
Front Axle Drive Shaft and Associated
Parts 4C±23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly 4C±24. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 4C±25. . . . . . . . . . . . . . . . . .
Bushing Replacement 4C±25. . . . . . . . . . . . . . . . . . Reassembly 4C±26. . . . . . . . . . . . . . . . . . . . . . . . . .
Shift On The Fly System 4C±28. . . . . . . . . . . . . . . . .
Shift On The Fly System and Associated
Parts 4C±28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly 4C±28. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 4C±30. . . . . . . . . . . . . . . . . .
Main Data and Specifications 4C±35. . . . . . . . . . .
Special Tools 4C±36. . . . . . . . . . . . . . . . . . . . . . . . . .
Front Propeller Shaft 4C±37. . . . . . . . . . . . . . . . . . . . .
General Description 4C±37. . . . . . . . . . . . . . . . . . . . .
Front Propeller Shaft and Associated Parts 4C±38
Removal 4C±38. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4C±39. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly (Except TOD 4y4) 4C±40. . . . . . . . .
Universal Joint Disassembly 4C±41. . . . . . . . . . . .
Inspection and Repair 4C±42. . . . . . . . . . . . . . . . . .
Universal Joint Reassembly 4C±45. . . . . . . . . . . . .
Reassembly (Except TOD 4y4) 4C±46. . . . . . . . . .
Main Data and Specifications 4C±47. . . . . . . . . . .
Rear Propeller Shaft 4C±48. . . . . . . . . . . . . . . . . . . . .
General Description 4C±48. . . . . . . . . . . . . . . . . . . . .
Rear Propeller Shaft and Associated Parts 4C±48
Removal 4C±49. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4C±49. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly 4C±50. . . . . . . . . . . . . . . . . . . . . . . . . .
Universal Joint Disassembly 4C±51. . . . . . . . . . . .
Inspection and Repair 4C±52. . . . . . . . . . . . . . . . . .
Universal Joint Reassembly 4C±53. . . . . . . . . . . . .
Reassembly 4C±54. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications 4C±55. . . . . . . . . . .

4C±2
DRIVE SHAFT SYSTEM
Service Precaution
WARNING: I F S O E Q U IPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED , do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
General Description
This publication contains essential removal, installation,
adjustment and maintenance procedures.
The front axle utilizes a central disconnect type front
axle/transfer case system.
The drive axles are completely flexible assemblies,
consisting of inner and outer constant velocity (CV) drive
shaft joints connected by an axle shaft.
For description of propeller shaft and universal joint, refer
to Front/Rear Propeller Shaft in this section.

4C±3 DRIVE SHAFT SYSTEM
Diagnosis
ConditionPossible causeCorrection
Oil Leak At Front AxleWorn or defective oil seal.Replace the oil seal.
Front axle housing cracked.Repair or replace.
Oil Leak At Pinion ShaftToo much gear oil.Correct the oil level.
Oil seal worn or defective.Replace the oil seal.
Pinion flange loose or damaged.Tighten or replace.
Noises In Front Axle Drive Shaft
JointBroken or worn drive shaft joints and
bellows (BJ and DOJ).Replace the drive shaft joints and
bellows.
ªClankº When Accelerating From
ªCoastºLoose drive shaft joint to output shaft
bolts.Tighten.
Damaged inner drive shaft joint.Replace.
Shudder or Vibration During
Acceleration
Excessive drive shaft joint angle.Repair.
AccelerationWorn or damaged drive shaft joints.Replace.
Sticking spider assembly (inner drive
shaft joint).Lubricate or replace.
Sticking joint assembly (outer drive
shaft joint).Lubricate or replace.
Vibration At Highway SpeedsOut of balance or out of round tires.Balance or replace.
Front end out of alignment.Align.
Noises in Front AxleInsufficient gear oil.Replenish the gear oil.
Wrong or poor grade gear oil.Replace the gear oil.
Drive pinion to ring gear backlash
incorrect.Adjust the backlash.
Worn or chipped ring gear, pinion
gear or side gear.Replace the ring gear, pinion gear or
side gear.
Pinion shaft bearing worn.Replace the pinion shaft bearing.
Wheel bearing worn.Replace the wheel bearing.
Differential bearing loose or worn.Tighten or replace.
Wanders and PullsWheel bearing preload too tight.Adjust the wheel bearing preload.
Incorrect front alignment.Adjust the front alignment.
Steering linkage loose or worn.Tighten or replace.
Steering gear out of adjustment.Adjust or replace the steering gear.
Tire worn or improperly inflated.Adjust the inflation or replace.
Front or rear suspension parts loose
or broken.Tighten or replace.
Front Wheel ShimmyWheel bearing worn or improperly
adjusted.Adjust or replace.
Incorrect front alignment.Adjust the front alignment.
Worn ball joint or bush.Replace the ball joint or bush.
Steering linkage loose or worn.Tighten or replace.
Steering gear out of adjustment.Tighten or replace.
Tire worn or improperly inflated.Replace or adjust the inflation.
Shock absorber worn.Replace the shock absorber.

4C±4
DRIVE SHAFT SYSTEM
Rear Axle Shaft
Rear Axle Shaft and Associated Parts
420RW014
Legend
(1) Brake Caliper
(2) Brake Disc
(3) Wheel Pin
(4) Axle Shaft Assembly
(5) Back Plate
(6) Parking Brake Assembly
(7) Bearing Holder(8) Bearing
(9) Retainer
(10) Snap Ring
(11) Bolt
(12) Nut
(13) Antilock Brake System (ABS) Speed Sensor (if
so equipped)
Removal
1. Raise the vehicle.
2. Remove tires and wheels. Refer to Wheel in Steering
section.3. Remove brake caliper. Use a wire to attach the brake
caliper to the frame. Refer to Disk Brakes in Brake
section.
4. Remove brake disc.
5. Remove ABS sensor (if so equipped).
6. Remove Parking brake assembly. Refer to Parking
Brakes in Brake section.