2007 MITSUBISHI LANCER EVOLUTION idle

MPI -On-vehicle Service13A-139
Checking the Coil Resistance
1. Disconnect the idle speed control servo connector.
2. Measure the resistance between terminal No. 2 and either
terminal No. 1 or terminal No. 3 of the connector at the
idle speed control servo side.
Standard value: 28 - 33Ω(at 20_C)
3. Measure the resistance between terminal No. 5 and either
terminal No. 6 or terminal No. 4 of the connector at the
idle speed control servo side.
Standard value: 28 - 33Ω(at 20_C)
Operation Check
1. Remove the throttle body.
2. Remove the stepper motor.
3. Connect the special tool (test harness: MB991709) to
the idle speed control servo connector.
4. Connect the positive (+) terminal of a power supply
(approximately 6 V) to the terminals No. 2 and No. 5.
5. With the idle speed control servo as shown in the
illustration, connect the negative ( - ) terminal of the power
supply to each clip as described in the following steps,
and check whether or not a vibrating feeling (a feeling
of very slight vibration of the stepper motor) is generated
as a result of the activation of the stepper motor.
(1) Connect the negative ( - ) terminal of the power supply
to the terminals No. 1 and No. 4.
(2) Connect the negative ( - ) terminal of the power supply
to the terminals No. 3 and No. 4.
(3) Connect the negative ( - ) terminal of the power supply
to the terminals No. 3 and No. 6.
(4) Connect the negative ( - ) terminal of the power supply
to the terminals No. 1 and No. 6
(5) Connect the negative ( - ) terminal of the power supply
to the terminals No. 1 and No. 4.
(6) Repeat the tests in sequence from (5) to (1).
6. If, as a result of these tests, vibration is detected, the
stepper motor can be considered to be normal.

MPI -Throttle Body13A-143
THROTTLE BODY
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation
DUnder Cover Removal and Installation
(Refer to GROUP 51 - Front Bumper.)
DEngine Coolant Draining and Supplying
(Refer to GROUP 14 - On-vehicle Service.)
DStrut Tower Bar Removal and Installation
(Refer to GROUP 42.)DAir Hose E, Air By-pass Hose, Air Pipe C Removal
and Installation (Refer to GROUP 15 - Intercooler.)
DAccelerator Cable Adjustment (Refer to GROUP 17
- On-vehicle Service.)
2
19¶3 N·m5.0¶1.0 N·m
1
34
5 6
7
5
Removal steps
1. Accelerator cable connection
2. Throttle position sensor connector
3. Idle speed control servo connector
4. Vacuum hose connection5. Water hose connection
6. Throttle body
"AA7. Throttle body gasket
INSTALLATION SERVICE POINT
"AATHROTTLE BODY GASKET INSTALLATION
Place the gasket so that the projecting part is positioned
as shown in the illustration, and then install it between the
intake manifold and the throttle body.
Up
Towards front of vehicle

MPI -Throttle Body13A-144
DISASSEMBLY AND REASSEMBLY
2.0±0.5 N•m
5
4
16
3
2
Removal steps
"AA1. Throttle position sensor
2. Idle speed control servo
3. O-ring4. Fixed SAS
5. O-ring
6. Throttle body
INSTALLATION SERVICE POINT
"AATHROTTLE POSITION SENSOR INSTALLATION
1. Set the throttle position sensor on the throttle body as
shown in illustration (1).
2. Turn and set the throttle position sensor to the position
shown in illustration (2), connect a circuit tester across
terminal No. 2 (Throttle position sensor output) and
terminal No. 4 (earth), and measure the output voltage.
Tighten the throttle position sensor with a screw at the
position where the output voltage is at the standard value.
Standard value: 0.535 - 0.735 V
(1) (2)

ENGINE COOLING -On-vehicle Service14-9
5. Connect the special tool (MB991658) to the harness side
of the engine coolant temperature sensor connector.
6. Connect the special tool [MB991791(APS)] to the special
tool (MB991658).
7. Start the engine and let it run at idle.
NOTE
Since the resistance value of the special tool (APS)
indicates a low engine coolant temperature, engine speed
increases.
8. When the lever of the special tool (APS) is turned to
the end, check that the engine speed decreases and
the radiator fan motor rotates.
9. When the lever of the special tool (APS) is turned to
the reverse direction, check that the voltage between
terminals of the radiator fan motor connector gradually
decreases from the battery voltage to 0 V.
10. If inoperable, replace the radiator fan controller.
(Refer to P.14-15.)
11. Install the center under cover.
(Refer to GROUP 51 - Front Bumper.)
12. Connect the engine coolant temperature sensor
connector.

1. Remove the center under cover.
(Refer to GROUP 51 - Front Bumper.)
2. Insert the special tool at the back of the radiator fan
motor connector.
3. Connect the special tool to the circuit tester.
4. Start the engine and run it at idle.
5. Turn the A/C switch to the ON position and hold the
engine coolant temperature at 80_C or lower.
6. When the voltage between the terminals of the radiator
fan motor connector, the following values of (1) - (3)
can be detected at random.
(1) 0 V
(2) 8.22.6 V
(3) Battery voltage2.6 V
7. If inoperable, replace the radiator fan controller.
(Refer to P.14-15.)
8. Install the center under cover.
(Refer to GROUP 51 - Front Bumper.)
Engine coolant
temperature sensor
connector
(harness side)
MB991791(APS)
MB991658
MB991658Lever
MB991791(APS)
Radiator fan
controller
MB991222
Circuit tester
Connector
rear view

ENGINE ELECTRICAL -Charging System16-5
(6) Reconnect the negative battery cable.
(7) Connect a tachometer or the MUT-II.
(Refer to GROUP 11 - On-vehicle Service.)
(8) Leave the hood open.
(9) Start the engine.
(10)With the engine running at 2,500 r/min, turn
the headlamps and other lamps on and off
to adjust the alternator load so that the value
displayed on the ammeter is slightly above 30
A.
Adjust the engine speed by gradually
decreasing it until the value displayed on the
ammeter is 30 A. Take a reading of the value
displayed on the voltmeter at this time.
Limit: max. 0.3 V
NOTE
When the alternator output is high and the value
displayed on the ammeter does not decrease
until 30 A, set the value to 40 A. Read the
value displayed on the voltmeter at this time.
When the value range is 40 A, the limit is max.
0.4 V.(11) If the value displayed on the voltmeter is above
the limit value, there is probably a malfunction
in the alternator output wire, so check the wiring
between the alternator “B” terminal and the
battery (+) terminal (including fusible link).
If a terminal is not sufficiently tight or if the
harness has become discolored due to
overheating, repair and then test again.
(12)After the test, run the engine at idle.
(13)Turn off all lamps and the ignition switch.
(14)Remove the tachometer or the MUT-II.
(15)Disconnect the negative battery cable.
(16)Disconnect the ammeter and voltmeter.
(17)Connect the alternator output wire to the
alternator “B” terminal.
(18)Connect the negative battery cable.
OUTPUT CURRENT TEST
Charging warning lampVoltmeter
Ammeter
Ignition switch
Alternator relayLoad
Battery
Engine-ECUAlternatorFR
L
S
G
+ -+-
B

ENGINE ELECTRICAL -Charging System16-6
This test determines whether the alternator output
current is normal.
(1) Before the test, always be sure to check the
following.
DAlternator installation
DBattery (Refer to GROUP 54 - Battery.)
NOTE
The battery should be slightly discharged.
The load needed by a fully-charged battery
is insufficient for an accurate test.
DAlternator drive belt tension
(Refer to GROUP 11 - On-vehicle Service.)
DFusible link
DAbnormal noise from the alternator while
the engine is running.
(2) Turn the ignition switch to the “LOCK” (OFF)
position.
(3) Disconnect the negative battery cable.
(4) Disconnect the alternator output wire from the
alternator “B” terminal. Connect a DC test
ammeter with a range of 0 - 100 A in series
between the “B” terminal and the disconnected
output wire. (Connect the (+) lead of the
ammeter to the “B” terminal. Connect the ( - )
lead of the ammeter to the disconnected output
wire.)
Caution
Never use clips but tighten bolts and nuts
to connect the line. Otherwise loose
connections (e.g. using clips) will lead to
a serious accident because of high current.
NOTE
An inductive-type ammeter which enables
measurements to be taken without
disconnecting the alternator output wire should
be recommended.
(5) Connect a voltmeter with a range of 0 - 20 V
between the alternator “B” terminal and the
earth. (Connect the (+) lead of the voltmeter
to the “B” terminal, and then connect the ( - )
lead of the voltmeter to the earth.)
(6) Connect the negative battery cable.
(7) Connect a tachometer or the MUT-II.
(Refer to GROUP 11 - On-vehicle Service.)
(8) Leave the hood open.
(9) Check that the reading on the voltmeter is equal
to the battery voltage.
NOTE
If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the alternator “B” terminal and the battery (+)
terminal.(10)Turn the light switch on to turn on headlamps
and then start the engine.
(11) Immediately after setting the headlamps to high
beam and turning the heater blower switch to
the high revolution position, increase the engine
speed to 2,500 r/min and read the maximum
current output value displayed on the ammeter.
Limit: 70 % of normal current output
NOTE
DFor the nominal current output, refer to the
Alternator Specifications.
DBecause the current from the battery will
soon drop after the engine is started, the
above step should be carried out as quickly
as possible in order to obtain the maximum
current output value.
DThe current output value will depend on
the electrical load and the temperature of
the alternator body.
DIf the electrical load is small while testing,
the specified level of current may not be
output even though the alternator is normal.
In such cases, increase the electrical load
by leaving the headlamps turned on for
some time to discharge the battery or by
using the lighting system in another vehicle,
and then test again.
DThe specified level of current also may not
be output if the temperature of the alternator
body or the ambient temperature is too
high. In such cases, cool the alternator and
then test again.
(12)The reading on the ammeter should be above
the limit value. If the reading is below the limit
value and the alternator output wire is normal,
remove the alternator from the engine and
check the alternator.
(13)Run the engine at idle after the test.
(14)Turn the ignition switch to the “LOCK” (OFF)
position.
(15)Remove the tachometer or the MUT-II.
(16)Disconnect the negative battery cable.
(17)Disconnect the ammeter and voltmeter.
(18)Connect the alternator output wire to the
alternator “B” terminal.
(19)Connect the negative battery cable.

ENGINE ELECTRICAL -Charging System16-8
(14)If the voltage reading conforms to the value
in the voltage regulation, then the voltage
regulator is operating normally.
If the voltage is not within the standard value,
there is a malfunction of the voltage regulator
or of the alternator.
(15)After the test, lower the engine speed to the
idle speed.
(16)Turn the ignition switch to the “LOCK” (OFF)
position.(17)Remove the tachometer or the MUT-II.
(18)Disconnect the negative battery cable.
(19)Disconnect the ammeter and voltmeter.
(20)Connect the alternator output wire to the
alternator “B” terminal.
(21)Remove the special tool, and return the
connector to the original condition.
(22)Connect the negative battery cable.
Voltage Regulation Table
Standard value:
Inspection terminalVoltage regulator ambient temperature_CVoltage V
Terminal “S”-2014.2 - 15.4
2013.9 - 14.9
6013.4 - 14.6
8013.1 - 14.5
WAVEFORM CHECK USING AN ANALYZER
MEASUREMENT METHOD
Connect the analyzer special patterns pick-up to the alternator
B terminal.
STANDARD WAVEFORM
Observation Conditions
FUNCTIONSPECIAL PATTERNS
PATTERN HEIGHTVARIABLE
VARIABLE knobAdjust while viewing the wave-
form.
PATTERN SELECTORRASTER
Engine speedCurb idle speed
AlternatorSpecial
patterns
pickupAnalyzer
B terminal

ENGINE ELECTRICAL -Charging System16-9
Voltage at
alternator
B terminal0.4
0.2
0
- 0.2
- 0.4
Time
NOTE
The voltage waveform of the alternator B terminal can undulate
as shown at left. This waveform is produced when the regulator
operates according to fluctuations in the alternator load
(current), and is normal for the alternator.
In addition, when the voltage waveform reaches an
excessively high value (approximately 2 V or higher at idle),
it often indicates an open circuit due to a brown fuse between
alternator B terminal and battery, but not a defective alternator.