Mitsubishi Lancer Evolution 7. Manual — part 209
MPI -
On-vehicle Service
13A-135
5. Use the jumper wire to connect terminal No. 1 of the
oxygen sensor connector to the battery (+) terminal and
terminal No. 3 to the battery (-) terminal.
Caution
Be very careful when connecting the jumper wire;
incorrect connection can damage the oxygen sensor.
6. Connect a digital voltage meter between terminal No.
2 and terminal No. 4.
7. While repeatedly racing the engine, measure the oxygen
sensor output voltage.
Standard value:
Engine
Oxygen sensor
output voltage
Remarks
When
racing the
engine
0.6 - 1.0 V
If you make the air/fuel ratio
rich by racing the engine
repeatedly, a normal oxy-
gen sensor will output a
voltage of 0.6 - 1.0 V.
8. If the sensor is defective, replace the oxygen sensor.
NOTE
For removal and installation of the oxygen sensor, refer
to GROUP 15 - Exhaust Pipe and Main Muffler.
<Oxygen sensor (rear)>
1. Disconnect the oxygen sensor connector and connect
the special tool (test harness set) to the connector on
the oxygen sensor side.
2. Make sure that there is continuity (11 - 18 Ω at 20_C)
between terminal No. 3 and terminal No. 4 on the oxygen
sensor connector.
3. If there is no continuity, replace the oxygen sensor.
NOTE
(1) If the MUT-II does not display the standard value
although no abnormality is found by the above
mentioned continuity test and harness check, replace
the oxygen sensor (rear).
(2) For removal and installation of the oxygen sensor,
refer to GROUP 15 - Exhaust Pipe and Main Muffler.
MD998464
Blue
Black
Red
White
Jumper
wire
Oxygen
sensor
(rear)
MB991223
Equipment side connector
MPI -
On-vehicle Service
13A-136
INJECTOR CHECK
OPERATION SOUND CHECK
Using a sound scope, check the operation sound of the injector
(“chh” sound) during idling and cranking.
Check that the operation sound increases when the speed
increases.
Caution
The sound of other injectors operating may be heard
even when the injector being checked is not operated.
NOTE
If no operation sound is heard, check the injector drive circuit.
If the circuit is normal, the injector or engine-ECU may be
faulty.
Measurement of Resistance between Terminals
1. Remove the injector connector.
2. Measure the resistance between terminals.
Standard value: 2 - 3 Ω (at 20_C)
3. Install the injector connector.
Checking the Injection Condition
1. Following the steps below, bleed out the residual pressure
within the fuel pipe line to prevent flow of the fuel. (Refer
to P.13A-96.)
2. Remove the injector.
3. Arrange the special tool (injector test set), adaptor, fuel
pressure regulator and clips as shown in the illustration
below.
MPI -
On-vehicle Service
13A-137
MB991607
High-pressure fuel hose
MD998741
MD998706
Return hose
Battery
Injector
Fuel pressure regulator
Clip
(MB991608)
4. Connect the MUT-II to the diagnosis connector.
5. Turn the ignition switch to “ON” position. (But do not start
the engine.)
6. Select “Item No. 07” from the MUT-II Actuator test to
drive the fuel pump.
7. Activate the injector and check the atomized spray
condition of the fuel.
The condition can be considered satisfactory unless it
is extremely poor.
8. Stop the actuation of the injector, and check for leakage
from the injector’s nozzle.
Standard value: 1 drop or less per minute
9. Activate the injector without activating the fuel pump; then,
when the spray emission of fuel from the injector stops,
disconnect the special tool and restore it to its original
condition.
10. Disconnect the MUT-II.
High-pressure
fuel hose
Battery
Injector
Return hose
MPI -
On-vehicle Service
13A-138
RESISTOR (FOR INJECTOR) CHECK
1. Disconnect the resistor connector.
2. Measure the resistance between each terminal.
Standard value:
Measurement terminal
Resistance Ω
1 - 3
5.8 - 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_C or
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
4
2
5
3
6
Equipment
side connector
Idle speed control
servo (steppermotor)
1
4
2
5
3
6
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