Mitsubishi 380. Manual — part 844

GENERAL DESCRIPTION

REAR SUSPENSION

34-2

GENERAL DESCRIPTION

M1341000100375

A low-mount multilink suspension system is used to
reduce road noise, making the vehicle quieter by all
suspension arms except a trailing arm connected to
the crossmembers with an elastic structure.

.

CONSTRUCTION DIAGRAM

REAR SUSPENSION DIAGNOSIS

INTRODUCTION TO REAR SUSPENSION DIAGNOSIS

M1341013100245

If the rear suspension is faulty, the vehicle will not run
straightforward or noise will occur. Incorrect wheel
alignment, malfunction of shock absorber, stabilizer
bar, coil spring, control arms or worn or out-of-bal-
ance will cause these problems.

REAR SUSPENSION DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1341013200242

Use these steps to plan your diagnostic strategy. If
you follow them thoroughly, you will be sure that you
have exhausted most of the possible ways to find a
rear suspension 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

Chart.

4. Verify malfunction is eliminated.

AC305738AB

SHOCK
ABSORBER

COIL SPRING

STABILIZER BAR

TOE CONTROL ARM
ASSEMBLY

LOWER ARM ASSEMBLY

UPPER ARM ASSEMBLY

TRAILING ARM
ASSEMBLY

REAR SUSPENSION
CROSSMEMBER

REAR SUSPENSION DIAGNOSIS

REAR SUSPENSION

34-3

SYMPTOM CHART

M1341013500276

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Squeaks or other Abnormal Noise

DIAGNOSIS

STEP 1. Check for loose rear suspension
installation bolts and nuts.

Q: Are the rear suspension installation bolts and nuts

loose?
YES :

Retighten them, and then go to Step 5.

NO :

Go to Step 2.

STEP 2. Check the condition of the shock
absorbers (worn bushings).

Q: Are the shock absorbers (bushings) in good

condition?
YES :

Go to Step 3.

NO :

Replace the faulty part, and then go to Step
5.

STEP 3. Check the upper arms and/or lower arms
and/or toe control arms for deformity or damage.

Q: Are the upper arms and/or lower arms and/or toe

control arms in good condition?
YES :

Go to Step 4.

NO :

Replace the faulty part, and then go to Step
5.

STEP 4. Check the trailing arms for deformity or
damage.

Q: Are the trailing arms in good condition?

YES :

Go to Step 5.

NO :

Replace the faulty part, and then go to Step
5.

STEP 5. Retest the system.

Q: Is the malfunction eliminated?

YES :

The procedure is complete.

NO :

Return to Step 1.

INSPECTION PROCEDURE 2: Poor Ride

DIAGNOSIS

STEP 1. Check for excessive tyre inflation
pressure.
Refer to GROUP 31, On-vehicle Service

− Tyre Infla-

tion Pressure Check

P.31-7

.

Q: Is the tyre inflation pressure correct?

YES :

Go to Step 2.

NO :

Adjust the pressure, and then go to Step 4.

STEP 2. Check the condition of the shock
absorbers (weak or broken springs).

Q: Are the shock absorbers in good condition?

YES :

Go to Step 3.

NO :

Replace the faulty part, and then go to Step
4.

SYMPTOM

INSPECTION PROCEDURE

REFERENCE PAGE

Squeaks or other abnormal noise

1

P.34-3

Poor ride

2

P.34-3

Body tilting

3

P.34-4

REAR SUSPENSION DIAGNOSIS

REAR SUSPENSION

34-4

STEP 3. Check the stabilizer bar and/or stabilizer
bar links for deformity or damage.

Q: Are the stabilizer bar and/or stabilizer bar links

deformed or damaged?
YES :

Replace the faulty part, and then go to Step

4.

NO :

Go to Step 4.

STEP 4. Retest the system.

Q: Is the malfunction eliminated?

YES :

The procedure is complete.

NO :

Return to Step 1.

INSPECTION PROCEDURE 3: Body Tilting

DIAGNOSIS

STEP 1. Check for weak or deteriorated
bushings.

Q: Are the bushings in good condition?

YES :

Go to Step 2.

NO :

Replace the faulty part, and then go to Step
5.

STEP 2. Check for weak or broken coil springs.

Q: Are the coil springs in good condition?

YES :

Go to Step 3.

NO :

Replace the faulty part, and then go to Step
5.

STEP 3. Check the upper arms and/or lower arms
and/or toe control arms for deformity or damage.

Q: Are the upper arms and/or lower arms and/or toe

control arms deformed or damaged?
YES :

Replace the faulty part, and then go to Step

5.

NO :

Go to Step 4.

STEP 4. Check the trailing arms for deformity or
damage.

Q: Are the trailing arms deformed or damaged?

YES :

Replace the faulty part, and then go to Step

5.

NO :

Go to Step 5.

STEP 5. Retest the system.

Q: Is the malfunction eliminated?

YES :

The procedure is complete.

NO :

Return to Step 1.

SPECIAL TOOLS

REAR SUSPENSION

34-5

SPECIAL TOOLS

M1341000600433

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991897
Ball joint remover

MB991113-01,
MB990635-01 or General
service tool

Knuckle and toe control
arm ball joint
disconnection

NOTE: Steering linkage
puller (MB990635 or
MB991113) is also
available to disconnect
knuckle and tie rod end
ball joint.

MB990326
Preload socket

General service tool

• Toe control arm ball

joint turning torque
check

• Stabilizer bar link ball

joint breakaway
torque check

MB990800
Ball joint dust cover
installer

MB990800-01or General
service tool

Toe control arm ball joint
dust cover installation

• A: MB991237

Spring compressor
body

• B: MB991239

Arm set

MIT221369 or general
service tool

Coil spring removal and
installation

NOTE: Spring
compressor set
(MB991832) is also
available to compress
coil spring (refer to
GROUP 33, Special
Tools

P.33-5

).

MB991680
Wrench set

• A: MB991681

Wrench

• B: MB991682

Socket

−

Shock absorber
disassembly and
assembly

AC106827

MB990326

MB990800

MB991237

A

B

MB991680

A

B