Page 1448 of 1500
27-1
GROUP 27
REAR AXLE
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .27-2
REAR AXLE DIAGNOSIS . . . . . . . . .27-2
INTRODUCTION TO REAR AXLE DIAGNOSIS27-2
REAR AXLE DIAGNOSTIC
TROUBLESHOOTING STRATEGY . . . . . . 27-2
SYMPTOM PROCEDURES . . . . . . . . . . . . 27-3
SPECIAL TOOLS . . . . . . . . . . . . . . . .27-4
ON-VEHICLE SERVICE . . . . . . . . . . .27-4
WHEEL BEARING END PLAY CHECK . . . 27-4
REAR HUB ROTARY-SLIDING RESISTANCE
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-5HUB BOLT REPLACEMENT . . . . . . . . . . . . 27-5
REAR AXLE HUB ASSEMBLY . . . . .27-6
REMOVAL AND INSTALLATION . . . . . . . . 27-6
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 27-7
KNUCKLE . . . . . . . . . . . . . . . . . . . . . .27-8
REMOVAL AND INSTALLATION . . . . . . . . 27-8
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 27-9
SPECIFICATIONS . . . . . . . . . . . . . . .27-10
FASTENER TIGHTENING SPECIFICATIONS27-10
SERVICE SPECIFICATIONS . . . . . . . . . . . 27-10
Page 1449 of 1500
GENERAL DESCRIPTION
REAR AXLE27-2
GENERAL DESCRIPTIONM1271000100326
The rear axle has the following features:
The wheel bearing incorporates a unit ball bear-
ing (double-row angular contact ball bearing) for
reduced friction.
The rear wheel hub assembly combines the hub,
wheel bearing, and oil seal in a single unit for
fewer parts, better durability, improved assembly
precision, and better structural organization.
ABS rotor for detecting the wheel speeds is
press-fitted to the rear hub.
CONSTRUCTION DIAGRAM
REAR AXLE DIAGNOSIS
INTRODUCTION TO REAR AXLE DIAGNOSISM1271004100254
Noise from the rear axle may be caused by defects in
the components.
REAR AXLE DIAGNOSTIC TROUBLESHOOTING STRATEGYM1271004200273
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
rear axle fault.
1. Gather information from the customer.2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Procedures.
4. Verify malfunction is eliminated.
Page 1450 of 1500
REAR AXLE DIAGNOSIS
REAR AXLE27-3
SYMPTOM PROCEDURESM1271004400222
INSPECTION PROCEDURE 1: Abnormal Noise
DIAGNOSIS
STEP 1. Check the rear hub assembly installation bolts for
looseness.
Q: Are the rear hub assembly installation bolts loosened?
YES : Tighten the rear hub assembly installation bolts to the
specified torque 73
7 Nm (54 5 ft-lb). Then go to
St e p 4 .
NO : Go to Step 2.
STEP 2. Check the wheel bearing end play.
(1) Remove the caliper assembly, and suspend the caliper
assembly with a wire and remove the brake disc.
(2) Check the bearing's end play. Place a dial gauge against
the hub surface; then move the hub in the axial direction
and check whether or not there is end play.
Limit: 0.05 mm (0.002 inch)
Q: Is the wheel bearing end play within the limit?
YES : Go to Step 3.
NO : Replace the rear hub assembly, then go to Step 4.
STEP 3. Check the rear hub rotary-sliding resistance.
(1) Remove the caliper assembly, and suspend the caliper
assembly with a wire and remove the brake disc.
(2) Turn the hub a few times to seat the bearing.
(3) Wind a rope around the hub bolt and turn the hub by pulling
at a 90
angle with a spring balance. Measure to determine
whether or not the rotary-sliding resistance of the rear hub
is within the limit value.
Limit: 24 N (5.4 lbs)
Q: Is the rear hub rotary-sliding resistance within the limit?
YES : Go to Step 4.
NO : Replace the rear hub assembly, then go to Step 4 .
STEP 4. Retest the systems.
Q: Are abnormal noises generated?
YES : Return to Step 1.
NO : The procedure is complete.
Page 1451 of 1500
SPECIAL TOOLS
REAR AXLE27-4
SPECIAL TOOLSM1271000600525
ON-VEHICLE SERVICE
WHEEL BEARING END PLAY CHECKM1271000900474
1. Remove the caliper assembly, and suspend the caliper
assembly with a wire and remove the brake disc.
2. Check the bearing's end play. Place a dial gauge against the
hub surface; then move the hub in the axial direction and
check whether or not there is end play.
Limit: 0.05 mm (0.002 inch)
3. If the play exceeds the limit, replace the rear hub assembly.
4. After having finished the inspection, install the brake disc,
caliper assembly and tighten the caliper assembly mounting
bolts to the specified torque.
Tightening torque: 60
5 Nm (45 3 ft-lb) TOOL TOOL NUMBER AND
NAMESUPERSESSION APPLICATION
MB990767
Front hub and flange
yoke HolderMB990767-01 Hub fixing
MB991618
Hub bolt removerGeneral service tool Hub bolt removal
MB991897
Ball joint removerMB991113-1,
MB990635-01 or general
service toolBall joint disconnection
NOTE: Steering linkage
puller(MB990635 or
MB991113)is also used
to disconnect knuckle
and toe control arm ball
joint.
Page 1453 of 1500
Page 1457 of 1500
SPECIFICATIONS
REAR AXLE27-10
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONSM1271004000332
SERVICE SPECIFICATIONSM1271000300502
ITEM SPECIFICATION
Knuckle Lower arm assembly to knuckle nut 113
12 Nm (83 9 ft-lb)
Shock absorber assembly to knuckle
bolt100
10 Nm (74 7 ft-lb)
Self locking nut (toe control arm
connection)66
6 Nm (49 4 ft-lb)
Trailing arm assembly to knuckle nut 113
12 Nm (83 9 ft-lb)
Upper arm assembly to knuckle nut 113
12 Nm (83 9 ft-lb)
Rear axle hub assembly Brake caliper assembly bolt 60
5 Nm (45 3 ft-lb)
Rear hub assembly bolt 73
7 Nm (54 5 ft-lb)
ITEM LIMIT
Wheel bearing end play mm (in) 0.05 (0.002)
Rear hub rotary-sliding resistance N (lb) 24 (5.4)
Page 1484 of 1500
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION23A-25
TORQUE CONVERTER STALL TESTM1231005400362
This test measures the maximum engine speed when the
selector lever is in the "D" or "R" position and the torque con-
verter stalls. This tests the operation of the torque converter,
starter motor and one-way clutch operation, as well as the hold-
ing performance of the clutches and brakes in the transmission.
Do not let anyone stand in front of or behind the vehi-
cle while this test is performed.
1. Check the transmission fluid level and temperature. Check
the engine coolant temperature.
Transmission fluid level: At the "HOT" mark on the dipstick
Transmission fluid temperature: 70 80C
Engine coolant temperature: 80 100C
NOTE: Measures transmission fluid temperature with
diagnostic tool MB991958 (MUT-III sub assembly).
2. Check both rear wheels.
3. Pull the parking brake lever on, with the brake pedal fully
depressed.
4. Start the engine. 9 Transmission
range: N (on a
flat and straight
road)Monitor data list
No.22 and No.23
with the diagnostic
tool MB991958
(MUT-III sub
assembly)
(1) Move selector
lever to R range,
drive at constant
speed of 10 km/hThe ratio between
data list No.22 and
No.23 should be the
same as the gear
ratio when reversing.Does not
shiftInput shaft
speed sensor
system
(P.23A-55).
Output shaft
speed sensor
system
(P.23A-72).
Reverse gear
incorrect ratio
(P.23A-196).
STEP CONDITION
BEFORE
TEST/OPERATIONTEST/OPERATION STANDARD INSPECTION
ITEMINSPECTION
PROCEDURE
PA G E
Page 1485 of 1500
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION23A-26
The throttle should not be fully open for any more than
five seconds.
If you repeat the stall test when the transmission fluid
temperature is greater than 80
C, move the selector
lever to the "N" position and let the engine run at
approximately 1,000 r/min for at least one minute. Wait
until the transmission fluid temperature returns to 80
C
or less.
5. Move the selector lever to the "D" position. Fully depress the
accelerator pedal and read the maximum engine speed at
this time.
Standard value: Stall speed: 2,100
2,600 r/min
6. Move the selector lever to the "R" position. Fully depress the
accelerator pedal and read the maximum engine speed.
Standard value: Stall speed: 2,100
2,600 r/min
TORQUE CONVERTER STALL TEST JUDGMENT
RESULTS
1. Stall speed is too high in both "D" and "R" range
Malfunction of the torque converter (Slippage on the splines
of the torque converter and the input shaft)
Low line pressure
Low-reverse brake slippage and malfunction of the one-way
clutch
2. Stall speed is too high in "D" range only
Underdrive clutch slippage
3. Stall speed is too high in "R" range only
Reverse clutch slippage
4. Stall speed is too low in both "D" and "R" ranges
Malfunction of the torque converter (Slippage of the
one-way clutch)
Insufficient engine output
HYDRAULIC PRESSURE TESTSM1231005500392
The transmission fluid temperature should be between 70
80C during the test.
1. Check the transmission fluid level and temperature. Check
engine coolant temperature.
Transmission fluid level: "HOT" mark on the dipstick
Transmission fluid temperature: 70 80C
Engine coolant temperature: 80 100C
2. Raise the vehicle so that the wheels are free to turn.
