2007 MITSUBISHI LANCER EVOLUTION idle

MPI -Troubleshooting13A-121
IDLE SPEED CONTROL SERVO (STEPPER MOTOR)
Measurement Method
1. Disconnect the idle speed control servo connector, and
connect the special tool (test harness: MB991709) in
between.
2. Connect the analyzer special patterns pickup to the idle
speed control servo-side connector terminal No. 1,
terminal No. 3, terminal No. 4 and terminal No. 6
respectively.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal No. 4, connection terminal No. 5,
connection terminal No. 17, and connection terminal No.
18 respectively.
Standard Wave Pattern
Observation conditions
FunctionSpecial patterns
Pattern heightHigh
Pattern selectorDisplay
Engine conditionWhen the engine coolant temperature is 20_C or below, turn the ignition switch from “LOCK”
(OFF) position to “ON” position (without starting the engine).
While the engine is idling, turn the A/C switch to ON.
Immediately after starting the warm engine
Standard wave pattern
Stepper
motor
control
signal
wave
pattern(V)
30
20
10The wave pattern
appears for an
instant, but soon
disappears.Point B
Coil reverse electromotive
force (Approx. 3×10 V)Point A
Induced electromotive force
from the motor turning
Time
Special
patterns
pickupAnalyzer

MPI -On-vehicle Service13A-126
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
1. Remove the air intake hose from the throttle body.
2. Spray cleaning fluid on a clean cloth.
3. Wipe off the dirt around the throttle valve with the cloth
sprayed with cleaning fluid.
Caution
(1) Do not spray the cleaning fluid directly to the
throttle valve.
(2) Make sure the cleaning fluid does not enter the
motor from the bypass line. Also make sure it
does not enter the sensor through the shaft.
(3) Be careful not to rub off the molybden applied
around the throttle valve shaft.
4. Attach the air intake hose.
5. Adjust the basic idle speed. (Refer to P.13A-127.)
THROTTLE POSITION SENSOR ADJUSTMENT
1. Connect the MUT-IIto the diagnosis connector.
When not using the MUT-II, proceed as follows:
(1) Disconnect the throttle position sensor connector, and
connect the special tool (test harness: MB991536)
between the disconnected connector taking care not
to confuse the terminal to be connected.
(2) Connect digital voltmeter between the terminal No.
2 and the terminal No. 4 of the throttle position sensor
connector.
2. Turn the ignition switch to “ON” position (but do not start
the engine).
3. Check the output voltage of the throttle position sensor.
Standard value: 535 - 735 mV
Throttle valve molybdenum
application section15 mm
15 mm
Equipment side connectorThrottle
position
sensor
Throttle
body
MB991536
Throttle position sensor

MPI -On-vehicle Service13A-127
4. If not within the standard value, loosen the throttle position
sensor mounting bolts. Then rotate the sensor body to
adjust.
5. Turn the ignition switch to “LOCK” (OFF) position.
6. Remove the MUT-II. If the MUT-IIis not used, remove
the special tool, and then connect the throttle position
sensor connector.
7. If a diagnosis code is displayed, erase the diagnosis code
by using the MUT-IIor disconnect the negative battery
cable from the battery terminal and then leave it for at
least ten seconds. After that, reconnect the battery cable,
and then let the engine run at idle for approximately 10
minutes.
BASIC IDLE SPEED ADJUSTMENT
NOTE
(1) The basic idling speed has been adjusted by the
speed adjusting screw by the manufacturer, and there
should usually be no need for readjustment.
(2) If the adjustment has been changed by mistake, the
idle speed may become too high or the idle speed
may drop too low when loads from components such
as the A/C are placed on the engine. If this occurs,
adjust by the following procedure.
(3) The adjustment, if made, should be made after first
confirming that the spark plugs, the injectors, the idle
speed control servo, the compression pressure, etc.,
are all normal.
1. Before inspection and adjustment, set the vehicle to the
pre-inspection condition.
2. Connect the MUT-IIto the diagnosis connector (16-pin).
NOTE
When the MUT-IIis connected, the diagnosis control
terminal should be earthed.
3. Start the engine and run at idle.
4. Select the item No. 30 of the MUT-IIActuator test.
NOTE
This holds the idle speed control servo at the basic step
to adjust the basic idle speed.
5. Check the basic idle speed.
Standard value: 850±100 r/min
NOTE
(1) The engine speed may be 20 to 100 r/min lower
than indicated above for a new vehicle [driven
approximately 500 km or less], but no adjustment
is necessary.
(2) If the engine stalls or the engine speed is low even
though the vehicle has been driven approximately
500 km or more, it is probable that deposits are
adhered to the throttle valve, so clean it. (Refer to
P.13A-126.)

MPI -On-vehicle Service13A-128
6. If not within the standard value range, turn the speed
adjusting screw to make the necessary adjustment.
7. Press the MUT-IIclear key, and release the idle speed
control servo from the Actuator test mode.
NOTE
Unless the idle speed control servo is released, the
Actuator test mode will continue 27 minutes.
8. Turn the ignition switch to “LOCK” (OFF) position.
9. Disconnect the MUT-II.
10. Start the engine again and let it run at idle speed for
approximately 10 minutes; check that the idling condition
is normal.
FUEL PRESSURE TEST
1. Release residual pressure from the fuel pipe line to prevent
fuel gush out. (Refer to P.13A-125.)
2. Disconnect the high-pressure fuel hose at the delivery
pipe side.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
3. Remove the union joint and bolt from the special tool
(adapter hose) and instead attach the special tool (hose
adapter) to the adapter hose.
4. Install the special tool (for measuring the fuel pressure)
that was set up in step 3.

(1) Install the special tool (for measuring the fuel pressure)
between the high-pressure fuel hose and the delivery
pipe.
(2) Install the fuel pressure gauge set (special tool) on
the special tool (for measuring the fuel pressure)
putting the gasket between them.
(3) Connect the lead wire of the fuel pressure gauge
set (special tool) to the power supply (cigarette lighter
socket) and to the MUT-II.
MB991637
Gasket
MD998709
MD998742
High-pressure
fuel hose
Delivery
pipe

MPI -On-vehicle Service13A-129

(1) Install the fuel pressure gauge on the special tool
(for measuring the fuel pressure) putting a suitable
O-ring or gasket between them.
(2) Install the special tool which was set up in step (1)
between the high-pressure fuel hose and the delivery
pipe.
5. Connect the MUT-IIto the diagnosis connector.
6. Turn the ignition switch to “ON” position. (But do not start
the engine.)
7. Select “Item No. 07” from the MUT-IIActuator test to
drive the fuel pump. Check that there are no fuel leaks
from any parts.
8. Finish the actuator test or turn the ignition switch to “LOCK”
(OFF) position.
9. Start the engine and run at idle.
10. Measure fuel pressure while the engine is running at
idle.
Standard value: Approximately 230 kPa at cerb idle
11. Disconnect the vacuum hose from the fuel pressure
regulator and measure fuel pressure with the hose end
closed by a finger.
Standard value: 289 - 309 kPa at cerb idle
12. Check to see that fuel pressure at idle does not drop
even after the engine has been raced several times.
13. Racing the engine repeatedly, hold the fuel return hose
lightly with fingers to feel that fuel pressure is present
in the return hose.
NOTE
If the fuel flow rate is low, there will be no fuel pressure
in the return hose.Fuel pressure gauge set
O-ring or gasket
MD998709
MD998742
High-pressure
fuel hose
Delivery
pipe

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

MPI -On-vehicle Service13A-134
THROTTLE POSITION SENSOR CHECK
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between the throttle position
sensor side connector terminal No. 1 and terminal No.
4.
Standard value: 3.5 - 6.5 kΩ
3. Measure the resistance between the throttle position
sensor side connector terminal No. 2 and terminal No.
4.
Normal condition:
Throttle valve slowly open
until fully open from the idle
positionChanges smoothly in
proportion to the opening
angle of the throttle valve
4. If the resistance is outside the standard value, or if it
doesn’t change smoothly, replace the throttle position
sensor.
NOTE
For the throttle position sensor adjustment procedure,
refer to P.13A-90.
OXYGEN SENSOR CHECK

1. Disconnect the oxygen sensor connector and connect
the special tool (test harness: MB998464) to the connector
on the oxygen sensor side.
2. Make sure that there is continuity (4.5 - 8.0Ωat 20_C)
between terminal No. 1 and terminal No. 3 on the oxygen
sensor connector.
3. If there is no continuity, replace the oxygen sensor.
4. Warm up the engine until engine coolant is 80_C or higher.
Equipment side connector
Throttle
bodyThrottle
position
sensor
Oxygen
sensor
(front)
Equipment
side connector
1
32
4
Oxygen
sensor
(front)
equipment
side
conenctor
MD998464 BlueRed

MPI -On-vehicle Service13A-138
RESISTOR (FOR INJECTOR) CHECK
1. Disconnect the resistor connector.
2. Measure the resistance between each terminal.
Standard value:
Measurement terminalResistanceΩ
1-35.8 - 6.2 (at 20_C)
4-3
5-3
6-3
IDLE SPEED CONTROL SERVO (STEPPER
MOTOR) CHECK
Checking the Operation Sound
1. Check that the engine coolant temperature is 20_Cor
below.
NOTE
Disconnecting the engine coolant temperature sensor
connector and connecting the harness-side of the
connector to another engine coolant temperature sensor
that is at 20_C or below is also okay.
2. Check that the operation sound of the stepper motor
can be heard after the ignition is switched “ON” position.
(but without starting the engine.)
3. If the operation sound cannot be heard, check the stepper
motor’s activation circuit.
If the circuit is normal, it is probable that there is a
malfunction of the stepper motor or of the engine-ECU.
Resistor
(for injector)
Fuel pump relay 3
1
42
53
6
Equipment
side connector
Idle speed control
servo (stepper motor) 1
42
53
6