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Mitsubishi 380. Manual - part 479

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-8

HOW TO PERFORM ACTUATOR TEST

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

CAUTION

To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
1. Connect diagnostic tool to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "System select."

4. Choose "MPI" from the System List.

5. Select "Actuator Test."

6. Choose an appropriate item and select the "OK" button(tick).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-9

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

CAUTION

2. Turn the ignition switch to the "ON" position.

3. Select "CAN bus diagnosis" from the start-up screen.

4. Ensure Model & Class details are correctly entered. Refer to

MUTT III Operaters Manual if in doubt.

NOTE: If details are not correct for vehicle ensure "erase"
button is used to delete incorrect details prior to entering the
correct details.

5. Enter correct vehicle details.

6. Select the "OK" button.

7. When the optional equipment screen is displayed, choose

the one which the vehicle is fitted with, and then select the
"OK" button.

8. "CAN Bus Diagnosis" screen is diplayed. Press the check

button to commence diagnosis. the configuration screen will
be displayed, showing any errors in "RED".

PROVISIONAL DTCs [MUT-III EOBD Test Mode -
Results (Mode 7)]

The diagnostic tool (MUT-III sub assembly) will display the
Provisional DTCs reported by ENGINE-ECU if the
ENGINE-ECU detects some malfunction for "Misfire", "Fuel
System" and "Comprehensive" monitoring during a SINGLE
Driving Cycle. The intended use of this data is to assist the
technician after a vehicle repair, and after clearing diagnostic
information, by reporting test result after a SINGLE Driving
Cycle. Note that the test results reported by this mode do not
necessarily indicate a faulty component/system. If test results
indicate a failure after ADDITIONAL (consecutive) driving, then
the Check Engine Warning Lamp) will be illuminated and a
DTC will set.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-10

DIAGNOSTIC BY DIAGNOSTIC TEST MODE II
(INCREASED SENSITIVITY - Where Applicable)

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

CAUTION

To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .

NOTE: When mode II is selected with , the Check Engine
Warning Lamp will light when the Engine-ECU first detects the
trouble (Note that this is only for emission-related trouble). At
the same time, the relevant diagnostic trouble codes will be
registered. In respect to the comprehensive component electri-
cal faults (opens/shorts), the time for the diagnostic trouble
code to be registered after the fault occurrence is four seconds
→ one second. Therefore, the confirmation of the trouble symp-
tom and the confirmation after completing repairs can be
reduced. To return to the normal mode I after mode II has been
selected once, the ignition switch must be turned "OFF" once
or mode I must be reselected with . The diagnostic trouble
code, system readiness test status and freeze frame data, etc.,
will be erased when mode I is returned to, so record these
before returning to mode I.
1. Connect diagnostic tool to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Change the diagnostic test mode of the Engine-ECU to

DIAGNOSTIC TEST MODE II (INCREASED SENSITIVITY).

4. Road test the vehicle.

5. Read the diagnostic trouble code and repair the

malfunctioning part.

6. Turn the ignition switch to the "LOCK" (OFF) position.

7. Disconnect diagnostic tool from the data link connector.

ON-BOARD DIAGNOSTICS

The Engine-ECU monitors the input/output signals (some signals all the time and others under specified con-
ditions) of the ENGINE-ECU. When a malfunction continues for a specified time or longer after the irregular
signal is initially monitored, the ENGINE-ECU judges that a malfunction has occurred. After the
ENGINE-ECU first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted
and the same malfunction is re-detected. However, for items marked with a "*", a diagnostic trouble code is
recorded on the first detection of the malfunction. The diagnostic results can be read out with a diagnostic
tool. The diagnostic results are memorized even if the ignition key is turned off or battery terminals are dis-
connected. In addition, the diagnostic trouble code can also be erased by turning the ignition switch to ON
and sending the diagnostic trouble code erase signal from diagnostic tool to the ENGINE-ECU.

NOTE: If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble code
is memorized. In this case, send the diagnostic trouble code erase signal to the ENGINE-ECU in order to
erase the diagnostic memory. The diagnostic items are all indicated sequentially from the smallest code num-
ber.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-11

EOBD- DRIVE CYCLE

All kinds of diagnostic trouble codes (DTCs) can be monitored by carrying out a short drive according to the
following three drive cycle patterns. In other words, doing such a drive regenerates any kind of trouble which
involves illuminating the Check Engine Warning Lamp and verifies the repair procedure has eliminated the
trouble [the Check Engine Warning Lamp is no longer illuminated].

CAUTION

Two technicians should always be in the vehicle when carrying out a test.

NOTE: Check that the diagnosis trouble code (DTC) is not output before driving the EOBD- drive cycle. Erase
the DTC if it has been output.

DRIVE CYCLE PATTERN LIST

PROCEDURE

MONITOR ITEM

DIAGNOSTIC TROUBLE
CODE (DTC)

Catalytic converter monitor

P0421, P0431

Heated oxygen sensor monitor

P0133, P0139, P0153,
P0159

Other monitor

Main components

P0106, P0107, P0108,
P0134, P0154, P0300,
P0301, P0302, P0303,
P0304, P0305, P0306,
P0506, P0507

Sensors and switches

P0101, P0102, P0103,
P0111, P0112, P0113, P0116,
P0117, P0118, P0125,
P0335, P0340, P0461

Wire breakage and short
circuit

P0130, P0131, P0132,
P0135, P0136, P0137,
P0138, P0140, P0150,
P0151, P0152, P0155,
P0156, P0157, P0158,
P0160, P0161, P0201,
P0202, P0203, P0204,
P0205, P0206, P0443

Content .. 477 478 479 480 ..