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Mitsubishi Eclipse. Manual - part 129

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-9

HOW TO CONNECT THE SCAN TOOL (MUT-III)

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON"

position.
NOTE: When the special tool MB991824 is energized, spe-
cial tool MB991824 indicator light will be illuminated in a
green color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting the scan tool MB991958 is the
reverse of the connecting sequence, making sure that the
ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODE

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

AK300810

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-10

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "MFI" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code"
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.

PROVISIONAL DTCs [SCAN TOOL MB991958
OBD-II Test Mode

− Results (Mode 7)]

The scan tool will display the Provisional DTCs reported by
engine control module (ECM) <M/T> or powertrain control
module (PCM) <A/T> if the ECM <M/T> or PCM <A/T> detects
some malfunction for "Misfire", "Fuel System" and "Compre-
hensive" monitoring during a SINGLE Driving Cycle. The
intended use of this data is to assist the technician after a vehi-
cle repair, and after clearing diagnostic information, by report-
ing 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 MIL will be illumi-
nated and a DTC will set.

MODE 6 REFERENCE TABLE

The engine control module (ECM) <M/T> or powertrain control module (PCM) <A/T> monitors the condition
of emission control system.
By selecting MODE 6 using scan tool, Test Result and Limit Value (minimum) *1 or (maximum) *2 about the
main items of emission control system which ECM <M/T> or PCM <A/T> monitors can be confirmed. The
value at the last monitoring is output by ECM <M/T> or PCM <A/T> as a test result.

AK300810

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-11

NOTE:

*1: The test fails if test value is less than this value.
*2: The test fails if test value is greater than this value.

TEST
ID

MONITORING
ITEM

SIMPLE TECHNICAL DESCRIPTION INDICATION OF

SCAN TOOL

CONVERSION
COEFFICIENT IN
USING GENERAL
SCAN TOOL

Catalyst
monitor

ECM <M/T> or PCM <A/T> monitors
the deterioration of catalyst by the
output frequency ratio between
heated oxygen sensor (front) and
heated oxygen sensor (rear).

Catalyst Frequency
Ratio
Test Result and Limit
Value (max.)

× 0.0039

EGR monitor

ECM <M/T> or PCM <A/T> monitors
the operation of EGR system by the
pressure difference of intake manifold
between before and after introduction
of EGR using the manifold absolute
pressure sensor.

EGR Monitor
Pressure Value
Test Result and Limit
Value (min.) kPa

× 0.43 kPa

Evaporation
leak monitor
(Small leak)

ECM <M/T> or PCM <A/T> monitors
the leak of fuel evaporation gas by the
reduction of vacuum in tank after
appointed time using the fuel tank
differential pressure sensor after
making the fuel tank and the fuel line
vacuum.

EVAP Leak Mon. 1
mm Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Gross leak)

EVAP Leak Mon.
Gross Pressure Value
Test Result and Limit
Value (min.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Very small
leak)

EVAP Leak Mon. 0.5
mm Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

Heated oxygen
sensor (front)
monitor
(Rich/Lean
switching)

ECM <M/T> or PCM <A/T> monitors
the deteriorated condition of the
heated oxygen sensor (front) by
checking the lean/rich switching
frequency of the heated oxygen
sensor (front).

HO2S B1 SENSOR1
Rich/Lean switching
Count
Test Result and Limit
Value (min.)

× 1count

Heated oxygen
sensor (rear)
monitor
(Voltage)

ECM<M/T> or PCM<A/T> checks the
output voltage of the heated oxygen
sensor (rear) in order to monitor
whether the heated oxygen sensor
(rear) output is stuck.

HO2S B1 SENSOR2
Change in Volt
Test Result and Limit
Value (min.)

× 19.5 mV

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-12

DIAGNOSTIC BY DIAGNOSTIC TEST MODE II
(INCREASED SENSITIVITY)

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
NOTE: When mode II is selected with scan tool MB991958
(MUT-III sub assembly), the Malfunction Indicator Lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) will light when
the engine control module (ECM) <M/T> or powertrain control
module (PCM) <A/T> first detects the trouble (Note that this is
only for emission-related trouble). At the same time, the rele-
vant diagnostic trouble codes will be registered. In respect to
the comprehensive component electrical 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 symptom and the confirmation
after completing repairs can be reduced. To return to the nor-
mal mode I after mode II has been selected once, the ignition
switch must be turned "OFF" once or mode I must be rese-
lected with scan tool MB991958 (MUT-III sub assembly). 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 scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Change the diagnostic test mode of the ECM <M/T> or PCM

<A/T> 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 scan tool MB991958 from the data link

connector.

AK300810

MB991911

16-PIN

MB991827

MB991824

Content .. 127 128 129 130 ..