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Mitsubishi Lancer Evolution IX. Manual - part 616

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-147

ECU backup
power supply

Any time

System voltage

Pressure sensor Ignition switch: ON

0.5

− 1.5 V

Steering wheel
sensor <ST-1>

Ignition switch: ON

Steering wheel: Turn
slowly

− 2 V ⇔ 2.5 − 4.5 V

flushing

Steering wheel
sensor <ST-2>

Ignition switch: ON

Steering wheel: Turn
slowly

− 2 V ⇔ 2.5 − 4.5 V

flushing

Idle switch

Ignition switch: ON

Accelerator pedal: Full
closed

1 V or less

Accelerator pedal:
Depress

4.5

− 5.0 V

Parking brake
switch

Ignition switch: ON

Parking brake lever: Pull 1 V or less
Parking brake lever:
Release

System voltage

Stop lamp switch Ignition switch: ON

Brake pedal: Depress

System voltage

Brake pedal: Release

1 V or less

TPS

Ignition switch: ON

Accelerator pedal: Full
closed

0.5

− 0.7 V

Accelerator pedal: Full
throttle

4.5

− 5.5 V

ACD mode
indicator lamp
<TARMAC>

Ignition switch: ON

ACD mode indicator lamp
position: TARMAC

0 V

ACD mode indicator lamp
position: Except for
above

Approx.10.5 V

ECU earth

Any time

1 V or less

Pressure sensor
power supply

Ignition switch: OFF

1 V or less

Ignition switch: ON

Approx.5.0 V

Steering wheel
sensor <ST-N>

Ignition switch: ON

Steering wheel: Neutral

− 2 V

Steering wheel: Turn from
the neutral position

2.5

− 4.5 V

ACD mode
switch

Ignition switch: ON

Switch: Press

System voltage

Switch: Release

0 V

ABS monitor

With ABS not active

System voltage

With ABS active

1.5 V or less

ACD mode
indicator lamp
<SNOW>

Ignition switch: ON

ACD mode indicator lamp
position: SNOW

0 V

ACD mode indicator lamp
position: Except for
above

Approx.10.5 V

Terminal
No.

Check item

Check condition

Normal state

TROUBLESHOOTING <M/T>

MANUAL TRANSMISSION (FF)

22A-148

TROUBLESHOOTING <M/T>

INTRODUCTION

M1221006900701

The manual transmission can exhibit any of the fol-
lowing symptoms: noise or vibration is generated, oil
leaks, shifting gears is hard or troublesome, or the
transmission jumps out of gear.
The causes of these symptoms could come from:
incorrect mounting, the oil level may be low, or a
component of the transmission may be faulty.

TROUBLESHOOTING STRATEGY

M1221007000626

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
manual transmission 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.

SYMPTOM CHART

M1221007100612

ACD mode
indicator lamp
<GRAVEL>

Ignition switch: ON

ACD mode indicator lamp
position: GRAVEL

0 V

ACD mode indicator lamp
position: Except for
above

Approx.10.5 V

Terminal
No.

Check item

Check condition

Normal state

Trouble symptom

Inspection
procedure No.

Reference page

Noise, vibration

Oil leaks

Hard shifting

Jumps out of gear

TROUBLESHOOTING <M/T>

MANUAL TRANSMISSION (FF)

22A-149

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Noise, vibration

DIAGNOSIS

STEP 1. Check the idle speed.

Q: Does the idle speed meet the standard values?

YES :

Go to Step 2.

NO :

Refer to GROUP 11A

− On-vehicle Service,

Idle Speed Check

P.11A-10

STEP 2. Check whether the transmission and
engine mount is loose or damaged.

Q: Are the transmission and engine mount loose or

damaged?
YES :

Tighten or replace the part. Then go to Step

NO :

Go to Step 3.

STEP 3. Check that the oil level is up to the lower
edge of the filler plug hole.

Q: Is the oil level up to the lower edge of the filler plug

hole?
YES :

Go to Step 4.

NO :

Refill DIA QUEEN SUPER MULTI GEAR
75W

−85W (GL−4) or exact equivalent. Then

go to Step 7.

STEP 4. Check for the specified oil.

Q: Is the specified oil DIA QUEEN SUPER MULTI

GEAR 75W

−85W (GL−4) or exact equivalent?

YES :

Go to Step 5.

NO :

If in doubt, replace the oil. Refer to

P.22A-152

. Then go to Step 7.

STEP 5. Remove the transmission. Check the
axial play of the input and output shafts.

Q: Does the axial play of the input and output shafts

meet the standard value?
YES :

Go to Step 6.

NO :

Adjust the axial play of the input and output
shafts. Then go to Step 7.

STEP 6. Disassemble the transmission. Check
the gears for wear and damage.

Q: Are the gears worn or damaged?

YES :

Replace the gears. Go to Step 7.

NO :

Go to Step 7.

STEP 7. Retest the systems.

Q: Is the noise or vibration still there?

YES :

Return to Step 1.

NO :

The procedure is complete.

AC102278AO

Filler plug

Transmission oil

Filler plug hole

TROUBLESHOOTING <M/T>

MANUAL TRANSMISSION (FF)

22A-150

INSPECTION PROCEDURE 2: Oil leaks

DIAGNOSIS

STEP 1. Visual check.
Raise the vehicle, and check for oil leaks. If oil leak is
difficult to locate, steam clean the transmission and
drive the vehicle for at 10 minutes. Then check the
leak again.

Q: Is the oil leak(s) found?

YES :

Go to Step 2.

NO :

Check for the oil leaks around the engine.
Then go to Step 4.

STEP 2. Visual check at the clutch housing.

Q: Do oil leaks appear around the joint between the

engine and the clutch housing?
YES :

Remove the transmission. Check the input

shaft oil seal, and replace if necessary.
Then go to Step 4.

NO :

Go to Step 3.

STEP 3. Check the oil seal or O-ring for damage.

Q: Is the oil seal or O-ring damaged?

YES :

Replace the oil seal or the O-ring. Then go

to Step 4.

NO :

Go to Step 4.

STEP 4. Retest the system.

Q: Is the oil still leaking?

YES :

Return to Step 1.

NO :

The procedure is complete.

INSPECTION PROCEDURE 3: Hard shifting

DIAGNOSIS

STEP 1. Check the transmission control

Q: Are the shift cable and the select cable in good

condition?
YES :

Go to Step 2.

NO :

Repair or replace the shift cable and the
select cable. Refer to

P.22A-157

. Then go

to Step 7.

STEP 2. Check the transmission oil.

Q: Is the oil dirty?

YES :

Replace the oil. Refer to

P.22A-152

. Then

go to Step 7.

NO :

Go to Step 3.

STEP 3. Check the clutch system.

Q: Is the clutch system normal?

YES :

Go to Step 4.

NO :

Repair or replace the clutch system. Refer
to GROUP 21B

− Clutch

P.21B-3

. Then go

to Step 7.

STEP 4. Remove and disassemble the
transmission. Check the control housing.

Q: Is the control housing in good condition?

YES :

Go to Step 5.

NO :

Repair or replace the control housing. Refer
to GROUP 22B

− Transmission

P.22B-11

Then go to Step 7.

STEP 5. Check for poor meshing of worn
synchronizer ring and gear cone.

Q: Is poor meshing or worn synchronizer ring and

gear cone found?
YES :

Repair or replace the synchronizer ring and

gear cone. Then go to Step 7.

NO :

Go to Step 6.

STEP 6. Check the synchronizer spring for
weakness.

Q: Is the synchronizer spring weak?

YES :

Replace the synchronizer spring. Then go

to Step 7.

NO :

Go to Step 7.

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