1999 MITSUBISHI LANCER EVOLUTION VI Workshop Manual

REAR AXLE – On-vehicle Service 27-37
WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT
1. Lift up the vehicle and release the parking brake.
2. Disconnect the AYC-ECU harness connector and take
measurements on the harness side connector.
Caution
Insert the probe from the harness side with the double
lock of the connector unlocked. Inserting it to the
terminal side could result in poor contact.
3. Turn the wheel to be tested at about 1/2 to one
revolution/sec. and check for the output voltage using
a circuit tester (AC mV range) or oscilloscope.
Terminal nos.
Front LHFront RHRear LHRear RH
7698
20192221
Output voltage:
When circuit tester is used: 70 mV or more
When oscilloscope is used: 200 mVp-p or more
(4) If the output voltage is lower than the above value, it
is probably attributable to the following faults. Check or
replace the wheel speed sensor as necessary.

Excessive clearance between the pole piece and rotor
of the wheel speed sensor

Defective wheel speed sensor
Waveform Check Using Oscilloscope
Check the harness and connector of the wheel speed sensor
for connection. Then, use an oscilloscope to check for output
voltage waveform of each sensor as follows.
Start the engine and monitor the sensor by turning the wheel;
for a driving wheel, let it turn by shifting into the 1st gear
and for a driven wheel turn it manually at a constant speed.
NOTE
(1) Waveform may be observed by actually running the
vehicle.
(2) The output voltage is low when the wheel speed remains
low and builds up as the wheel speed increases.
AYC-ECU connector harness side
When turned manually
At idle (5 to 6 km/h)
1st gear

REAR AXLE – On-vehicle Service 27-38
Waveform Observation Points
SymptomProbable causeAction
Waveform amplitude is too small, or no
waveform.Defective wheel speed sensorReplace sensor.
Waveform amplitude varies greatly. (No
problem ifthe smallest amplitude is 100
Excessive axle hub lateral and radial runoutReplace hub.
problem if the smallest amplitude is 100
mV or more)Poor AYC-ECU groundingRepair.
Noise on waveform or disturbed
waveform
Open-circuited sensorReplace sensor.
waveform
Open-circuited harnessRepair harness.
Improperly mounted wheel speed sensorCorrect sensor installation.
Missing or collapsed ABS rotor toothReplace ABS rotor.
Caution
Since the wheel speed sensor cable follows the movement of the front or rear suspension, it
may be open-circuited only when the vehicle is run on rough roads and not on ordinary road.
The wheel speed sensor output voltage waveform should therefore be checked also by rocking
the sensor harness so that driving on rough roads may be simulated.
ACTION WHEN BATTERY RUNS OUT
When the engine is started using a booster cable where the
battery has completely run down and you attempt to start
the vehicle without waiting for the battery to recover a certain
charge, the engine can misfire and you just cannot start to
move it. In such cases, charge the battery sufficiently; or,
remove the AYC fusible link from the engine compartment
relay box to make AYC inactive before attempting to start
the vehicle. When the fusible link is removed, the AYC warning
lamp lights up. After the battery has been recharged, fit the
fusible link back again and start the engine to ensure that
the AYC warning lamp is off.AYC fusible link

REAR AXLE – Hydraulic Unit 27-39
HYDRAULIC UNIT
REMOVAL AND INSTALLATION
Caution
(1) When connecting the return hose and suction hose, do not apply lubricant.
(2) No foreign matter should be allowed in the hydraulic piping and joints.
Pre-removal Operation

Trunk Side Trim Removal

Hydraulic Piping Fluid DrainingPost-installation Operation

Hydraulic Piping Fluid Filling and Bleeding
(Refer to P.27-32, 34.)

Trunk Side Trim Installation
1 23 45
6
7 8 9
10 11 12
1314
12 Nm
4
12 Nm
18 Nm
12 Nm
12 Nm 18 Nm
34 Nm
34 Nm
Removal steps
1. Dust guard
2. Suction hose and return hose con-
nection
3. Hydraulic unit hose assembly con-
nection
4. Hydraulic unit and bracket assem-
bly mounting bolt
C5. Hydraulic unit and bracket assem-
bly
A6. Hydraulic unit7. Hydraulic unit bracket
8. AYC harness
9. Hydraulic unit bracket
10. Hydraulic unit hose assembly
B11. Return hose
B12. Suction hose
A13. Grommet
14. Oil reservoir

REAR AXLE – Hydraulic Unit 27-40
REMOVAL SERVICE POINTS
AHYDRAULIC UNIT REMOVAL
Should the hydraulic unit be discarded, drill a hole in the
accumulator at the illustrated position beforehand in order
to release the inside gas.
Caution
(1) The hydraulic unit has its accumulator filled with a
high pressure gas. Never throw it into a fire. Also,
never attempt to disassemble, press, weld or melt
it.
(2) When drilling a hole in the accumulator, be sure to
wear safety goggles since drill chips may blow out
together with the gas.
INSTALLATION SERVICE POINTS
AGROMMET INSTALLATION
On the vehicle mounted with a sunroof, mount the drain pipe
to the grommet as illustrated.
BSUCTION HOSE / RETURN HOSE INSTALLATION
Fit the suction hose and return hose to the nipple of hydraulic
unit as illustrated.
CHYDRAULIC UNIT AND BRACKET ASSEMBLY
INSTALLATION
Hook the hydraulic unit bracket hook to the rear floor side
member and install the hydraulic unit and bracket assembly
mounting bolt.Grommet
Drain pipe
25 ± 5 mm
Nipple
Suction hose and
return hose15 mm
Hook
Rear floor side member

REAR AXLE – Sensor Relay 27-41
SENSOR RELAY
REMOVAL AND INSTALLATION
Caution: SRS
For vehicles with SRS, before removal of air bag module and clock spring, refer to GROUP 52B
– Service Precautions and Air Bag Module and Clock Spring.
12
3
4
Steer sensor removal steps

Steering wheel and column cover
A1. Steer sensorAcceleration sensor and AYC relay
removal
2. Longitudinal acceleration sensor
3. Lateral acceleration sensor
4. AYC relay
NOTE
For the wheel speed sensor, refer to GROUP 35B.
REMOVAL SERVICE POINT
ASTEER SENSOR REMOVAL
Remove the steer sensor from the column switch.
Caution
(1) A photocoupler is used as the steer sensor. Use care
not to allow dust or grease to be on the sensor.
(2) Do not bend or dirty with grease the slit plate on
the column switch side.Slit plate
Steer sensor

REAR AXLE – Sensor Relay / AYC-ECU27-42
INSPECTION
1. LONGITUDINAL AND LATERAL ACCELERATION
SENSOR CHECK
Refer to GROUP 35B – Acceleration Sensor.
2. AYC RELAY CONTINUITY CHECK
Battery voltageTerminal No.
1345
When not energized
When energized
AYC-ECU
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Front Floor Console Removal and Installation
5 Nm
AYC-ECU
5 Nm

FRONT SUSPENSION – General / Lower Arm 33A-1
GROUP 33A
FRONT SUSPENSION
GENERAL
OUTLINE OF CHANGE

The installation method of the ball joint between the knuckle and the lower arm has been changed,
and accordingly the removal and installation procedures of the lower arm have been revised.

LOWER ARM
REMOVAL AND INSTALLATION
Caution
The part marked with * should be first temporarily tightened, then torqued to specification with the vehicle
on the ground in unloaded condition.
Post-installation Operation

Push the Dust Cover of the Lower Arm and Stabilizer Link Ball Joint with a Finger to Check for Possible Cracks or Damage.

Wheel Alignment Check and Adjustment
1
2
3
4
5
6
39 Nm
106 Nm*
5
98 – 118 Nm
74 – 87 Nm88 Nm
137 Nm
Removal steps
1. Stabilizer link mounting nut
2. Bolt
3. Stabilizer bracket
A4. Bushing assembly
5. Lower arm assembly6. Lower arm bracket assembly
NOTE
Follow the conventional procedures for installation service
points.

NOTES