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Mitsubishi Space Star. Manual - part 54

MPI –

General Information

13B-3

MULTI-POINT FUEL INJECTION SYSTEM DIAGRAM

1 Oxygen sensor (front)

2 Vacuum sensor

3 Intake air temperature sensor

4 Throttle position sensor

5 Camshaft position sensor

6 Crank angle sensor

7 Engine coolant temperature sensor

8 Detonation sensor

9 Oxygen sensor (rear)

Power supply voltage

Vehicle speed sensor

A/C switch

Power steering fluid pressure switch

Vehicle speed sensor

Ignition switch – ST

Ignition switch – IG

Engine-

ECU

1 Injector

2 Purge control solenoid valve

3 Idle speed control valve

4 EGR control servo valve

Fuel pump relay

Engine control relay

A/C power relay

Engine warning lamp

Diagnosis signal

Ignition coil (power transistor)

Fan controller

2 Vacuum sensor

3 Intake air temperature sensor

3 Idle speed control valve

Air cleaner

To fuel
tank

Fuel pressure
regulator

From fuel
pump

PCV valve

Injector

EGR valve

4 Throttle position sensor

7 Engine coolant

temperature sensor

4 EGR control solenoid valve

Canister

2 Purge control

solenoid valve

1 Oxygen

sensor
(front)

9 Oxygen

sensor (rear)

6 Crank angle sensor

Catalytic
converter

Air

8 Detonation

sensor

Catalytic
converter

5 Camshaft position sensor

MPI –

Service Specifications/Special Tools

13B-4

SERVICE SPECIFICATIONS

Items

Standard value

Intake air temperature sensor resistance k

Ω

2.3 – 3.0

0.30 – 0.42

Oxygen sensor output voltage (during revving) V

0.6 – 1.0

Oxygen sensor heater resistance (at 20

Ω

Front

4.5 – 8.0

Rear

11 – 18

SPECIAL TOOLS

Tool

Number

Name

Use

MB991536

Throttle position
sensor adjustment
harness

Measurement of voltage during trouble-
shooting

MB991658

Test harness set

Measurement of voltage during trouble-
shooting

MD998464

Test harness
(4-pin, square)

Measurement of voltage during trouble-
shooting

Inspection of oxygen sensor (front)

MD998478

Test harness
(3-pin, triangle)

Measurement of voltage during trouble-
shooting

Inspection using an analyzer

MPI –

Troubleshooting

13B-5

TROUBLESHOOTING

DIAGNOSIS FUNCTION

ENGINE WARNING LAMP (CHECK ENGINE LAMP)

If an abnormality occurs in any of the following items related
to the Multipoint Fuel Injection (MPI) system, the engine
warning lamp will illuminate. If the lamp remains illuminated
or if the lamp illuminates while the engine is running, check
the diagnosis code output.
However, the warning lamp will illuminate as bulb check for
five seconds whenever the ignition switch is turned to the
ON position.

Engine warning lamp inspection items

Code No.

Diagnosis item

–

Engine-ECU

P0105

Vacuum sensor system

P0110

Intake air temperature sensor system

P0115

Engine coolant temperature sensor system

P0120

Throttle position sensor system

P0125

Feedback system

P0130

Oxygen sensor (front) system <sensor 1>

P0135

Oxygen sensor heater (front) system <sensor 1>

P0136

Oxygen sensor (rear) system <sensor 2>

P0141

Oxygen sensor heater (rear) system <sensor 2>

P0170

Abnormal fuel system

P0201

No. 1 injector system

P0202

No. 2 injector system

P0203

No. 3 injector system

P0204

No. 4 injector system

P0300

Random cylinder misfire detected

P0301

No. 1 cylinder misfire detected

P0302

No. 2 cylinder misfire detected

P0303

No. 3 cylinder misfire detected

P0304

No. 4 cylinder misfire detected

P0335

Crank angle sensor system

P0340

Camshaft position sensor system

P0403

EGR control solenoid valve system

P0420

Catalyst malfunction

P0443

Purge control solenoid valve system

P0505

Idle speed control system

Engine warning lamp
(check engine lamp)

MPI –

Troubleshooting

13B-6

NOTE
1.

If the engine warning lamp illuminates because of a malfunction of the engine-ECU, communication
between MUT-

and the engine-ECU is impossible. In this case, the diagnosis code cannot be read.

After the engine-ECU has detected a malfunction, the engine warning lamp illuminates when the engine
is next turned on and the same malfunction is re-detected. However, for items marked with a “

”

in the diagnosis code number column, the engine warning lamp illuminates only on the first detection
of the malfunction.

After the engine warning lamp illuminates, it will be switched off under the following conditions.
(1) When the engine-ECU monitored the power train malfunction three times* and met set condition

requirements, it detected no malfunction.
*:

In this case, “one time” indicates from engine start to stop.

(2) For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature, etc.)

are similar to those when the malfunction was first recorded.

Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.

METHOD OF READING AND ERASING DIAGNOSIS
CODES

Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.

DIAGNOSIS USING DIAGNOSIS 2 MODE

Switch the diagnosis mode of the engine control unit to
DIAGNOSIS 2 mode using the MUT-

Carry out a road test.

Take a reading of the diagnosis code and repair the problem
location.

Turn the ignition switch to OFF and then back to ON again.

NOTE
By turning the ignition switch to OFF, the engine-ECU will
switch the diagnosis mode from DIAGNOSIS 2 mode to
DIAGNOSIS 1 mode.

Erase the diagnosis codes.

INSPECTION USING MUT-

DATA LIST AND

ACTUATOR TESTING

Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.

After repairing, re-check using the MUT-

and check that

the abnormal input and output have returned to normal
as a result of the repairs.

Erase the diagnosis code memory.

Remove the MUT-

, and then start the engine again and

carry out a road test to confirm that the problem has
disappeared.

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