power steering MITSUBISHI LANCER EVOLUTION 2007 Service Owner's Manual

MPI -Troubleshooting13A-46
Code No. P0551 Power steering fluid pressure switch
systemProbable cause
Range of Check
DIntake air temperature is - 10_C or higher.
DBarometric pressure is 76 kPa or more.
DEngine coolant temperature is 30_C or more.
DRepeat the *1 drive and *2 stop ten times or more.
*1: Engine speed is 2500 r/min or higher, volumetric efficiency is 55 % or higher and
vehicle speed is 5 km/h or higher for 4 seconds or more.
*2: Vehicle speed is 1.5 km/h or lower.
Set Conditions
DPower steering fluid pressure switch remains on.DPower steering fliud pressure switch failed
DOpen or short circuit in the power steering fluid
pressure switch circuit or loose conector contact
DMulfunction of engine-ECU
NG
OKOK
NGCheck the following connectors:
C-122, C-136
NG
OKNG
OK
Check the harness between the
power steering fluid pressure switch
and engine-ECU.
DCheck for short-circuit of the
output cable.Repair Repair
OKIntermittent malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
OK
Measure at the A-48 power steering
fluid pressure switch connector.
DDisconnect the connector to
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal No. 1
and earth
OK:System voltageNGMeasure at the C-122 engine-ECU
connector.
DMeasure the engine-ECU terminal
voltage.
DIgnition switch: ON
DVoltage between terminal No. 37
and earth
OK:System voltage
OK
NG
Replace the engine-ECU.
MUT-IIData list
DNo. 27: Power steering fluid pressure switch (Refer to
P.13A-103.)
OK
Check the following connector:A-48NG
Repair
NG
Repair OK
Check the following connector:
C-126, C-136
Check and repair the harness
between the power steering fluid
pressure switch and engine-ECU.
DCheck for disconnection of the
output cable.
Replace the engine-ECU.
OK
NG
MUT-IIData list
DNo. 27: Power steering fluid
pressure switch (Refer to
P.13A-103.)Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
Measure at the C-122 engine-ECU connector.
DMeasure the engine-ECU terminal voltage.
DEngine: Idling
DVoltage between terminal No. 37 and earth
DSteering wheel: Stationary state
OK:System voltage
DSteering wheel: Steered state
OK:1 V or less
OK
Replace the power steering fluid
pressure switch.Repair
Check the following connector:
C-122NG
Repair
Check the following connector:C-122
Check the harness between the
power steering fluid pressure switch
and engine-ECU.
DCheck for damage of the output
cable.OK
Repair NG

MPI -Troubleshooting13A-63
Inspection Procedure 8
Unstable idling (Rough idling, hunting), inappropriate
idling speed (High or low idling speed), engine stalls (Die
out) during idling
Probable cause
Causes shown on right are suspected.DIdle speed control system malfunction
DAir/fuel ratio control system malfunction
DIgnition system malfunction
DFuel system malfunction
DIntake and exhaust system malfunction
DExhaust gas purifier system malfunction
DThrottle valve malfunction
DTiming belt malfunction
DImproper compression pressure
DEngine-ECU malfunction
OK
To the next page
OK
MUT-IIData list
DNo. 11: Oxygen sensor (front) (Refer to P.13A-102.)NGCheck the Code No. P0130: Oxygen sensor (front) system.
(Refer to P.13A-24.)
OK
Check the throttle body (throttle valve section) for contamination.NGClean the throttle body (throttle valve section).
(Refer to P.13A-126.)
OK
Check the air intake from the intake hose and intake manifold.NG
Repair
OK
Check the timing marks on the timing belt.NGAlign the timing marks on the timing belt.
OK
MUT-IIData list
DNo. 27: Power steering fluid pressure switch
(Refer to P.13A-103.)NGCheck the Power steering fluid pressure switch system. (Refer to
P.13A-51, PROCEDURE FOR DAIGNOSIS CODE P0551)
OK
MUT-IIData list
DNo. 45: Idle speed control servo position (Refer to P.13A-105.)NGCheck the Idle speed control servo (stepper motor) system. (Refer
to P.13A - 49 PROCEDURE FOR DIAGNOSIS CODE P0505)
NO
MUT-IIData list
DNo. 12: Air flow sensor
DNo. 13: Intake air temperature sensor
DNo. 14: Throttle position sensor
DNo. 21: Engine coolant temperature sensor
DNo. 25: Barometric pressure sensor
(Refer to P.13A-102.)

Proceed to OK if all service data values are correct.
Proceed to NG if there is even one abnormal service data value.NGRefer to inspections for diagnosis code of sensor showing abnormal
service data. (Refer to P.13A-12.)
NO
MUT-IISelf-Diag code
DIs a diagnosis code output?YESINSPECTION CHART FOR DIAGNOSIS CODE
(Refer to P.13A-12.)
Has the battery terminal been disconnected recently?YESAfter warming up the engine, idle for approximately 10 minutes.

MPI -Troubleshooting13A-104
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
25Barometric
pressure
Ignition switch: ONAltitude: 0 m101 kPaCode No.
P0105
13A-15
pressure
sensor
Altitude: 0 m95 kPa
P0105
Altitude: 0 m88 kPa
Altitude: 0 m81 kPa
27Power
steering
fluidEngine: Idle operationSteering wheel
stationaryOFFCode No.
P055113A-46
fluid
pressure
switchSteering wheel turningON
28A/C switchEngine: Idle operation
(When A/C switch isA/C switch: OFFOFFProcedure
No. 2613A-92
(WhenA/Cswitchis
ON, A/C compressor
should be operating.)A/C switch: ONON
No.26
34Air flow
sensorEngine: After
warm-upIdle operationONCode No.
P010013A-13
sensor
reset
signal
warm up
3,000 r/minOFF
P0100
37Volumetric
efficiency
DEngine coolant
temperature:
Idle operation15 - 35%--
efficiencytemperature:
85 - 95_C
DLightningand
2,500 r/min15 - 35%
DLightning and
accessories:
OFFExcessive
accellerationAccording to ac-
celeration, volu-
metric efficiency
is increased.
41Injectors*1Engine: CrankingWhen engine coolant
temperature is 0_C
(injection is carried out
for all cylinders simulta-
neously)25 - 37 ms--
When engine coolant
temperature is 20_C15 - 22 ms
When engine coolant
temperature is 80_C4.2 - 6.3 ms
Injectors*2DEngine coolant
temperature:
80–95_C
Engine: Idle operation1.5 - 2.7 ms--
80–95_C
DLamps, electric
cooling fan and
allaccessories:
2,500 r/min1.2 - 2.4 ms
allaccessories:
OFF
DTransmission:
Neutral
When engine is sud-
denly racedIncreases

MPI -Troubleshooting13A-111
Terminal No.Normal condition Check condition (Engine condition) Check item
37Power steering fluid
pressure switchEngine: Idling after
warming upWhen steering wheel
is stationarySystem voltage
When steering wheel
is turned1 V or less
38Engine control relayIgnition switch: “LOCK” (OFF)System voltage
Ignition switch: “ON”1 V or less
39Fuel pump relay 3While engine is idling, suddenly depress the
accelerator pedal.Temporarily rises slightly
from 1 V or less.
41Alternator FR
terminalDEngine: After warm-up, idle operation
DRadiator fan: Not operating
DHead lamp: OFF→ON
DStop lamp: OFF→ON
DRear deffogger switch: OFF→ONVoltage decrease
44Intercooler water
spray switch (Auto)DIgnition switch: “ON”
DIntercooler water spray switch: ON1 V or less
DIgnition switch: “ON”
DIntercooler water spray switch: OFFSystem voltage
45A/C switchEngine: Idle operationTurn the A/C switch
OFF0.5 V or less
DA/C switch: ON
DA/C setting
temperature
When room tem-
perature is 25_C
or more: Max
Cool
When room tem-
perature is 25_C
or less: Max. HotSystem voltage
53Secondary air control
solenoid valveIgnition switch: “ON”System voltage
54Oxygen sensor
heater(Rear)
Engine: Idling after warming up1 V or less
heater(Rear)
Engine speed: 5,000r/minSystem voltage
55Intercooler water
sprayrelay
Ignition switch: “ON”System voltage
spray relay
Ignition switch: “LOCK” (OFF)1 V or less
58Tachometer signalEngine speed: 3,000r/min0.3 - 3.0 V
60Oxygen sensor
heater(front)
Engine: Idling after warming up1 V or less
heater(front)
Engine speed: 5,000r/minSystem voltage
71Ignition switch - STEngine: Cranking8 V or more

MPI -On-vehicle Service13A-131
COMPONENT LOCATION
NameSymbolNameSymbol
A/C relayJFuel pump relay 1, 2Q
A/C switchTFuel pump relay 3H
Air flow sensor (integrated intake air tempera-
ture sensor and barometric pressure sensor)OFuel pump resistorH
Camshaft position sensorNIdle speed control servo (stepper motor)G
Crank angle sensorKIgnition coil (integrated power transister)M
Detonation sensorEInjectorC
Diagnosis connectorSOxygen sensor (front)L
EGR control solenoid valveDOxygen sensor (rear)X
Engine control relayIPower steering fluid pressure switchA
Engine coolant temperature sensorNResistor (for injector)H
Engine warning lamp (check engine lamp)RSecondary air control solenoid valveD
Engine-ECUUThrottle position sensorG
Fan motor relayJVehicle speed sensorF
Fuel pressure control solenoid valveBWaste gate solenoid valveP
ABCDEFGHIJK
LMNOP
QRSTU

ENGINE ELECTRICAL -Ignition System16-36
12
3
8.8±1.0 N·m
4 5
6 7
8.8±1.0 N·m49±9 N·m
49±9 N·m40±5 N·m 12±2 N·m
22±4 N·m
22±4 N·m
12±2 N·m
22±4 N·m
Removal steps
1. Power steering oil pressure switch
connector
2. Heat protector
AA"3. Power steering oil pump, bracket and
oil reservoir assembly4. Power steering oil pump bracket
5. Crank angle sensor connector
6. Crank angle sensor
7. Connector bracket
REMOVAL SERVICE POINT
AA"POWER STEERING OIL PUMP, BRACKET AND
OIL RESERVOIR ASSEMBLY REMOVAL
Remove the power steering oil pump, bracket and oil reservoir
assembly with the hose attached from the bracket.
NOTE
Tie the removed oil pump with a rope and set aside where
they cannot hinder the removal of the power steering oil pump
bracket.

MANUAL TRANSMISSION - Troubleshooting 22A-6
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis
code No.Diagnosis itemsReference page
12Power supply voltage (valve power supply) systemopen circuit or short-circuit22A-8
13Fail-safe relay system open circuit or short-circuit22A-8
21Wheel speed sensor systemopen circuit or short-circuit22A-9
22Wheel speed sensor systemopen circuit or short-circuit22A-9
23Wheel speed sensor systemopen circuit or short-circuit22A-9
24Wheel speed sensor systemopen circuit or short-circuit22A-9
25Wrong-diameter tire22A-11
26Wheel speed sensor (faulty output signal)22A-13
31Steering wheel sensor systemopen circuit or short-circuit22A-15
32Steering wheel sensor systemshort-circuit22A-16
33fixed22A-16
34Steering wheel sensor systemshort-circuit or output
fixed22A-17
41TPS systemopen circuit or ground22A-18
42short-circuit22A-18
45Pressure sensor systemopen circuit or ground22A-19
46open earth22A-19
47abnormal power supply22A-20
51Longitudinal G sensor systemopen circuit or short-circuit22A-21
52defective sensor22A-22
56Lateral G sensor systemopen circuit or short-circuit22A-23
57defective sensor22A-24
61Stop lamp switch systemopen circuit22A-25
62ACD mode switch systemstuck22A-26
63Parking brake switch systemshort-circuit or not re-
turned to original position22A-27
65ABS monitor systemopen circuit or defective
ABS22A-28
71Proportional valve systemopen circuit or short-circuitRefer to
GROUP27B
72Directional control valve systemopen circuit or short-circuit
GROUP27B.
73Directional control valve systemopen circuit or short-circuit
74Proportional valve systemopen circuit or short-circuit22A-29

MANUAL TRANSMISSION - Troubleshooting 22A-11
Code No.25 Wrong-diameter tireProbable cause
Code No.25 is output as wrong-diameter tire when one of the four vehicle
speeds is outside the range of specified values in respect to the average of the
four vehicle speed sensors, when the vehicle speed is above 20 km/h with the
steering wheel in the straight ahead position.
However the warning lamp does not light up.DTire fault
DWheel speed sensor fault
DRotor fault
DWheel bearing fault
DHarness or connector fault
DABS-ECU fault
D4WD-ECU fault

OK NG
OK
Check the following connector:C-44
NG→Repair
Check the following connectors:
C-44, B-123
C-44, C-147, B-123
NG→Repair OKYES
OK
OK
Check the wheel speed sensor and rotor.
(Refer to GROUP 35B - Wheel Speed Sensor.)
NG→Repair
Check the wheel speed sensor output voltage. (Refer to
GROUP 35B - On-vehicle Service.)OK
Check the wheel speed sensor installation.
NG→Repair
NG
OK
Check the wheel beearing. (Refer to GROUP 26 - On-vehicle
Service, and GROUP 27B - Rear Hub Assembly.)
NG→Repair
OK
Check the following connectors:
B-123, A-03, A-37, D-10, D-04, D-30,
C-146, C-111, C-128, A-43
B-123, A-03, A-37, D-10, D-04, D-30,
C-146, C-111, C-128, C-136
NG→Repair NG
MUT-IIData List
DNo.01 Vehicle speed sensor
DNo.02 Vehicle speed sensor
DNo.03 Vehicle speed sensor
DNo.04 Vehicle speed sensor
OK:The speed meter display and MUT-IIdisplay match.
OK→Intermittent malfunction (Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Measure at 4WD-ECU connector C-44.
DMeasure the ECU terminal voltage.
DIgnition switch: ON
DRotate the tire corresponding to the measured terminal by
one and a half to one rotate per second.
(1) Voltage between terminal 9 and body earth
(2) Voltage between terminal 6 and body earth
(3) Voltage between terminal 7 and body earth
(4) Voltage between terminal 8 and body earth
OK:Changes by 0 V↔5V.
MUT-IIData List
DNo.01 Vehicle speed sensor
DNo.02 Vehicle speed sensor
DNo.03 Vehicle speed sensor
DNo.04 Vehicle speed sensor
OK:The speed meter display and MUT-IIdisplay match.
NG→Replace the 4WD-ECU.
OK→Intermittent malfunction (Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions)
Refer to GROUP 35B - Troubleshooting. (Refer to Diagnosis
Code No.11, 12, 13, 14, 21, 22, 23, and 24.)
Are all four wheels mounted to normal tires?
NO→Repair
Check the harness between the ABS-ECU and each wheel
speed sensor.
DCheck for open circuit and ground of the output line.
DCheck for open circuit and damage of the earth line.
NG→Repair
OK
Check the harness between the 4WD-ECU and
ABS-ECU.
DCheck for open circuit, ground and damage of
the power line.
NG→RepairOK

MANUAL TRANSMISSION - Troubleshooting 22A-15
Code No.31 Steering wheel sensor
systemProbable cause
Code No.31 is output when open circuit or short circuit of the steering wheel
sensor output line (ST-1, ST-2, or ST-N) occurs.DSteering wheel sensor fault
DHarness or connector fault
D4WD-ECU fault
OK NG NO
OK
MUT-IIData List
DNo.21 Steering wheel sensor
voltage
DNo.22 Steering wheel sensor
voltage
DNo.23 Steering wheel sensor
voltage
OK:Refer to P.22A-35 (Data
List Reference Table).
OK→Intermittent malfunction (Refer
to GROUP 00 - Points to Note for
Intermittent Malfunctions)
Check the following connector:C-43
NG→Repair YES
MUT-IIDiagnosis Code
DAre the ABS Diagnosis Code
Nos.81, 82, 83 output?
MUT-IIData List
DNo.21 Steering wheel sensor voltage
DNo.22 Steering wheel sensor voltage
DNo.23 Steering wheel sensor voltage
OK:Refer to P.22A-35 (Data List Reference Table).
NG→Replace the 4WD-ECU.
OK→Intermittent malfunction (Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions)
NG (No change from 0 V or
from above 4.5 V)
Measure at 4WD-ECU connector C-43.
DMeasure the ECU terminal voltage.
DIgnition switch: ON
(1) Voltage between terminal 33 and earth (Steering wheel
sensor )
(2) Voltage between terminal34and earth (Steering wheel
sensor )
(3) Voltage between terminal44 andearth (Steering wheel
sensor )
OK:When the steering wheel is turned, changes at
approx. 1.5 V – 3.5 V.
(1) NG
NG (Changes at 1 V
- 4.5 V or more)
OK
Check the harness between the steering wheel sensor and
ignition switch.
DCheck for open circuit, ground and damage of the power
line.
NG→Repair
Check the following connectors:C-230, C-102, C-209,
C-210
NG→Repair
OKOK
Check the following connectors:
C-230, C-128, C-43
C-230, C-43
NG→Repair
OK
Check the harness between 4WD-ECU and steering
wheel sensor.
DCheck for open circuit, short circuit, and damage of
the output line.
NG→Repair
Replace the steering wheel sensor.
Replace the Steering wheel sensor.
OK
OK
Check the following connector:
C-230
NG→RepairNG
Measure at Steering wheel sensor
connector C-230.
DDisconnect the connector and
measure at the harness side.
DIgnition switch: ON
DVoltage between terminal 2 and
earth
OK:System voltage
DResistance between terminal 3
and body earth
OK:2Ωor less
OK
Check the following connectors:
C-230, C-102, C-209, C-210
NG→Repair
Check the harness between the
ignition switch and steering wheel
sensor.
DCheck for open circuit and
damage on power line.
NG→Repair
(2) NG
OK
Check the harness between the steering wheel sensor and
body earth.
DCheck for open circuit and damage of the earth line.
NG→Repair
Check the following connector:C-230, C-08
NG→Repair
Measure at steering wheel sensor connector C-230.
DDisconnect the connector and measure at the
harness side.
DIgnition switch: ON
(1) Voltage between terminal 2 and earth
OK:System voltage
(2) Resistance between terminal 3 and body earth
OK:2Ωor less

MANUAL TRANSMISSION - Troubleshooting 22A-36
Item
no.Normal conditions Check condition Check item
19Pressure sensor power
supplyIgnition switch: ONApprox.5 V
20Valve power supplyIgnition switch: ONSystem voltage
21Steering wheel sensor
voltage Ignition switch: ONSteering wheel: Turn1 - 2 V and 2.5 - 4.5 V
are displayed alter-
nately.
22Steering wheel sensor
voltage Ignition switch: ONSteering wheel: Turn1 - 2 V and 2.5 - 4.5 V
are displayed alter-
nately.
23Steering wheel sensor
ltSTN
Ignition switch: ONSteering wheel: Neutral1-2Vg
voltage
g
Steering wheel: Turn2.5 - 4.5 V
51Idle switchIgnition switch: ONAccelerator pedal: Full
closedON
Accelerator pedal: PressOFF
52Steering wheel sensor
STN
Ignition switch: ONsteering wheel: NeutralONg

g
Steering wheel: Turn from
the neutral positionOFF
53Steering wheel sensor
Ignition switch: ONSteering wheel: Turn slowlyON and OFF are dis-
played alternaltely.
54Steering wheel sensor
Ignition switch: ONSteering wheel: Turn slowlyON and OFF are dis-
played alternately
55Steering wheel sensor
learning Perform actual drivingSteering wheel sensor neu-
tral position learning exe-
cutedON
Steering wheel sensor neu-
tral position learning unex-
ecutedOFF
56Stop lamp switchIgnition switch: ONBrake pedal: DepressONppg
Engine: StoppedBrake pedal: ReleaseOFF
57Motor monitorElectric pump motor is currently operatingON
Electric pump motor is currently not operatingOFF
58Oil pressure stateElectric pump motor is currently operatingLOWp
Electric pump motor is currently not operatingHIGH
59Directional valve
Ri ht
AYC clutch right side is currently operatingON
AYC clutch right side is currently not operatingOFF
60Directional valve
Lft
AYC clutch left side is currently operatingON
AYC clutch left side is currently not operatingOFF
61ABS monitorABS is currently operatingON
ABS is currently not operatingOFF
62Parking brake switchIgnition switch: ONParking brake lever: PullONgg
Engine:StoppedParking brake lever: Re-
leaseOFF
63ACD mode switchIgnition switch: ONACD mode switch: PressONg
Engine:StoppedACD mode switch: ReleaseOFF