sensor MITSUBISHI LANCER EVOLUTION VI 1999 Repair Manual

MPI – Troubleshooting13-66
Terminal
No.Normal condition Check condition (Engine condition) Check item
87Idle position switchIgnition switch: ONSet throttle valve to idle
position0 – 1 V
Slightly open throttle
valve4 V or more
88Camshaft position
sensor
Engine: Cranking0.4 – 3.0 V
sensor
Engine: Idle speed0.5 – 2.0 V
89Crank angle sensorEngine: Cranking0.4 – 4.0 V
Engine: Idle speed1.5 – 2.5 V
90Air flow sensorEngine: Idle speed2.2 – 3.2 V
Engine speed: 2,000 r/min

MPI – Troubleshooting13-67
RESISTANCE AND CONTINUITY BETWEEN HARNESS SIDE CONNECTORS AND TERMINALS
Engine-ECU Harness Side Connector Terminal Arrangement
Terminal No.Inspection itemNormal condition (Check condition)
1 – 12No.1 injector2 – 3 Ω (At 20C)
14 – 12No.2 injector
2 – 12No.3 injector
15 – 12No.4 injector
3 – 12Fuel pressure control valve28 – 36 Ω (At 20C)
4 – 12Stepper motor coil (A1)28 – 33 Ω (At 20C)
17 – 12Stepper motor coil (A2)
5 – 12Stepper motor coil (B1)
18 – 12Stepper motor coil (B2)
6 – 12Secondary air control solenoid valve28 – 36 Ω (At 20C)
11 – 12Wastegate solenoid valve62 – 74 Ω (At 20C)
60 – 12Oxygen sensor heater
11 – 18 Ω (at 20C)
13 – Body earthEngine-ECU earthContinuity established (0 Ω)
26 – Body earth
72 – 92Intake air temperature sensor5.3 – 6.7 kΩ (When intake air temperature is 0C)
2.3 – 3.0 kΩ (When intake air temperature is 20C)
1.0 – 1.5 kΩ (When intake air temperature is 40C)
0.30 – 0.42 kΩ (When intake air temperature is 80C)
74 – 77High temperature sensor3 Ω or less
83 – 92Engine coolant temperature sensor5.1 – 6.5 kΩ (When coolant temperature is 0C)
2.1 – 2.7 kΩ (When coolant temperature is 20C)
0.9 – 1.3 kΩ (When coolant temperature is 40C)
0.26 – 0.36 kΩ (When coolant temperature is 80C)
87 – 92Idle position switchContinuity established (when throttle valve is at idle
position)
No continuity (when throttle valve is slightly open)
91 – Body earth–Continuity established

FRONT AXLE – General / Axle Hub and Knuckle 26-1
GROUP 26
FRONT AXLE
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 axle hub and the knuckle have been
revised.
AXLE HUB AND KNUCKLE
REMOVAL AND INSTALLATION
Caution
(1) For vehicles with AYC, be careful when handling the pole piece at the tip of the speed sensor so as
not to damage it by striking against other parts.
(2) For vehicles with AYC, be careful not to damage the rotors installed to B.J. outer race during removal
and installation of the drive shaft.
Post-installation Operation

Check the Dust Cover for Cracks or Damage by
Pushing it with Finger.
1
23
4 5 6 7
8
12 1415
1388 Nm 108 – 127 Nm
90 – 110 Nm
15 – 33 Nm177 – 275 Nm 25 Nm
25 Nm
9 Nm
103 Nm
74 –87
Nm
11 910
1610
11
Ball joint kit
Removal steps
1. Front speed sensor AYC>
A2. Caliper assembly
3. Brake disc
4. Split pin
BA5. Drive shaft nut
6. Front hub assembly
7. Dust shield
8. Connection for lower arm ball joint
9. Connection bolt for lower arm joint10. Lower arm ball joint
11. Dust cover
12. Split pin
C13. Connection for tie rod end
D14. Front drive shaft
15. Front strut mounting bolt
16. Knuckle
NOTE
Follow the conventional procedures for removal
and installation service points.

27-1
REAR AXLE
CONTENTS
GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline of Change 2. . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 2. . . . . . . . . . . . . .
LUBRICANT 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 3. . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 4. . . . . . . . . . . . .
ON-VEHICLE SERVICE
31. . . . . . . . . . . . . . .
Rear Axle Total Backlash Check 31. . . . . . . . . . .
Gear Oil Level Check 31. . . . . . . . . . . . . . . . . . . .
Gear Oil Change 32. . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Level Check 33. . . . . . . . . . . . . . . . . . . . . . . . Bleeding 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AYC Operation Check 34. . . . . . . . . . . . . . . . . . . .
Hydraulic Pressure Check 35. . . . . . . . . . . . . . . . .
Differential Carrier Oil Seal
Replacement 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel Speed Sensor Output Voltage
Measurement 37. . . . .
Action When Battery Runs Out 38. . . . . . . . . . . .
HYDRAULIC UNIT
39. . . . . . . . . . . . . . .
SENSOR RELAY
41. . . . . . . . . . . . . . .
AYC-ECU 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR AXLE – Troubleshooting 27-5
3. INSPECTION CHART FOR DIAGNOSIS CODE
Diagnosis
code No.Diagnosis itemsRef. page
12Power supply voltage (valve power supply) system (open- or short-circuit)27-6
21FR wheel speed sensor system (open- or short-circuit)27-6
22FL wheel speed sensor system (open- or short-circuit)27-6
23RR wheel speed sensor system (open- or short-circuit)27-6
24RL wheel speed sensor system (open- or short-circuit)27-6
25Wrong-diameter tire27-8
26Faulty wheel speed sensor27-9
31Steer sensor (ST-1, ST-2, ST-N) system (open-circuit)27-10
32Steer sensor (ST-N) system (short-circuit)27-10
33Steer sensor (ST-N) system27-11
34Steer sensor (ST-1, ST-2) system (short-circuit)27-11
41TPS system (open- or short-circuit)27-12
51Longitudinal acceleration sensor system (open- or short-circuit)27-12
52Longitudinal acceleration sensor27-13
56Lateral acceleration sensor system (open- or short-circuit)27-12
61Stop lamp switch system (open-circuit)27-13
65ABS monitor system (open-circuit or defective ABS)27-14
71Proportioning valve system (open- or short-circuit)27-14
72Directional control valve (right) system (open- or short-circuit)27-15
73Directional control valve (left) system (open- or short-circuit)27-16
81AYC relay system (open- or short-circuit)27-17
82Electric pump system27-18
83Electric pump system27-19

REAR AXLE – Troubleshooting 27-6
4. INSPECTION PROCEDURES FOR DIAGNOSIS CODES
Code No. 12: Power supply voltage (valve power supply)
systemProbable cause
This code is output when the AYC-ECU power supply voltage drops below, goes
beyond, a specified level.
Defective harness or connector

Defective battery

Defective AYC-ECU
NOTE
Refer to the corresponding item if any other diagnosis code is being output.
Is the battery voltage correct?NG
Replace
OK
Measure at B-96 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Voltage across 31 and body ground
OK:System voltageNGCheck the following connectors:
B-96, B-94, B-49, B-75, B-76
OK
Check the trouble symptom.
NG
Check and repair harness between
ignition switch (IG
2) and AYC-ECU. OKReplace AYC-ECU.NG
Repair
Code Nos. 21, 22, 23, 24: Wheel speed sensor systemProbable cause
This code is output if any one of three wheel speed sensors fails to provide an input
even after the other wheel exceeded 8 km/h.
Defective harness or connector

Defective ABS-ECU

Defective AYC-ECU

NG
Replace AYC-ECU.
OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.NG
Repair
OK
Check the trouble symptom.
Is an ABS diagnosis code No. 21, 22,
23, or 24 output?YESRefer to Group 35B – Troubleshooting
NO
Measure at B-95 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Turn tire at 1/2 to 1 revolution/sec.

Voltage across 6/7/8/9 and body
ground
OK:42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)OKCheck the following connector:
B-95
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95NG
RepairNG
Repair

REAR AXLE – Troubleshooting 27-7

OK
Check the wheel bearing.
NG
Check and repair the harness between
wheel speed sensor and AYC-ECU.
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19NG
Repair
OK
Measure at B-95 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Resistance across 7-20 (front, LH),
6-19 (front, RH), 9-22 (rear, LH),
and 8-21 (rear, RH).
OK:1.4 – 1.8 kΩ.NGCheck the wheel speed sensor. (Refer
to Group 35B.)
Check the installation of wheel speed
sensor.NG
Repair
OK
Check the wheel speed sensor output
voltage. (Refer to P.27-37)NGCheck the wheel speed sensor and
ABS rotor. (Refer to Group 35B.)NG
Replace
NG
Replace

REAR AXLE – Troubleshooting 27-8
Code No. 25: Wrong-diameter tireProbable cause
This code is output if the speed of any one of the four wheels exceeds a specified
level with respect to the average of the four wheel speed sensor outputs when the
steering wheel is in the straight-ahead position and the vehicle speed exceeds 20
km/h. At this time, the warning lamp does not light up.
Defective harness or connector

Defective AYC-ECU

Defective ABS-ECU

OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.NG
Repair
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95NG
Repair
OK
Check the trouble symptom.
NO
Measure at B-95 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Turn tire at 1/2 to 1 revolution/sec.

Voltage across 6/7/8/9 and body
ground.
OK:42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)OKCheck the following connector:
B-95
YES
Is ABS diagnosis code No. 15 output?YESGroup 35* – Refer to Troubleshooting
Are correct tires mounted on all four
wheels?NO
Repair
NG
Repair

NO
Repair
NOCheck and repair the harness between
wheel speed sensor and AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19NG
Repair
OK
Check wheel bearing.NG
Replace
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95NG
Repair
OK
Check wheel speed sensor output volt-
age. (Refer to p. 27-37.)NGCheck wheel speed sensor and ABS
rotor. (Refer to Group 35B.)
YES
Check Wheel speed sensor for instal-
lation.NG
Repair
Are correct tires mounted on all four
wheels?
NG
Replace

REAR AXLE – Troubleshooting 27-9
Code No. 26: Wheel speed sensor system (faulty output
signal)Probable cause
This code is output if the speed of one of the four wheels exceeds a specified level
when the vehicle speed is 20 km/h or more. At this time, the warning lamp is turned
on.
Defective harness or connector

Defective AYC-ECU

Defective ABS-ECU

OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.NG
Repair
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95NG
Repair
OK
Check the trouble symptom.
NO
Measure at B-95 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Turn tire at 1/2 to 1 revolution/sec.

Voltage across 6/7/8/9 and body
ground.
OK:42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)NGCheck the following connector:
B-95
Is ABS diagnosis code No. 15 output?YESRefer to Group 35B – Troubleshooting
NG
Repair

NG
Check and repair the harness between
wheel speed sensor and AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19NG
Repair
OK
Check wheel bearing.NG
Replace
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95NG
Repair
OK
Check wheel speed sensor output volt-
age. (Refer to P.27-37.)NGCheck wheel speed sensor and ABS
rotor. (Refer to Group 35B.)
Check wheel speed sensor for installa-
tion.NG
Repair
NG
Replace

REAR AXLE – Troubleshooting 27-10
Code No. 31: Steer sensor (ST-1, ST-2, ST-N) systemProbable cause
This code is output when any of the steer sensors ST-1, ST-2, and ST-N is open-circuited
or the steer sensor ground wire is open-circuited.
Defective steer sensor

Defective harness or connector

Defective AYC-ECU
OK
Replace the steer sensor.
NG
Check the harness between steer sen-
sor and AYC-ECU.NG
Repair
NG
Check and repair the harness between
speed sensor and AYC-ECU.
OK
Check the trouble symptom.
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-65, B-98NG
Repair
NG: Voltage remains
at 4 V or more.
Measure at B-98 steer sensor connec-
tor.

Disconnect the connector and
measure at the harness side.

Continuity across 3 and body
ground
OK:ConductingNGCheck the following connectors:
B-98, B-50NG
Repair
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
Measure at B-95 AYC-ECU connector.

Connector connected.

Ignition switch: ON

Voltage across 4/5/17 and body ground.
OK:The voltage alternates between about
3 V and about 0.5 V when the steering
wheel is turned.OKCheck the following connector:
B-95NG
Repair
NG: Voltage alternates
between 4 V or
more and 0.5 V.NG: Voltage
remains
at 0 V.
Code No. 32: Steer sensor (ST-N) systemProbable cause
This code is output when the steering wheel is considered to be turned 40 or more
as determined with ST-1 and ST-2 with ST-N ON (LOW voltage).
Defective steer sensor

Defective harness or connector

Defective AYC-ECU
OK
Replace the steer sensor.
NG
Check the harness between steer sen-
sor and AYC-ECU.NG
Repair
OK
Replace AYC-ECU.
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the trouble symptom.
NG
Measure at B-95 AYC-ECU connector.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Turn steering wheel about 90 in
either direction from the straight-
ahead position.

Voltage across 17 and body
ground.
OK:No continuityNGCheck the following connectors:
B-95, B-65, B-98NG
Repair
Measure at B-95 AYC-ECU connector.

Connector connected.

Ignition switch: ON

Turn steering wheel about 90 in
either direction from the straight-
ahead position.

Voltage across 17 and body
ground.
OK:The voltage increases from
about 0.5 V or less to about
3 V.OKCheck the following connector:
B-95NG
Repair