Mitsubishi Galant. Manual — part 81

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-5

M U LTIPO R T FU EL IN JEC TIO N (M FI) D IA G N O SIS

TROUBLESHOOTING STRATEGY

M1131008500093

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to have
exhausted most of the possible ways to find an MFI
fault.
1. Gather as much information as possible about the

complaint from the customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any MFI Diagnostic Trouble

Code (DTC).

4. If you cannot verify the condition and there are no

DTCs, the malfunction is intermittent. For
information on how to cope with intermittent
malfunctions, refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How

to cope with Intermittent Malfunction

P.00-8

5. If you can verify the condition but there are no

DTCs, or the system cannot communicate with
the scan tool, refer to the trouble symptom
classification table.

6. If there is a DTC, record the number of the code,

then erase the code from the memory using the
scan tool.

NOTE: If a DTC is erased, its "freeze frame" data will
be also erased and the readiness test status will be
reset. If necessary, store the "freeze frame" data
before erasing the DTC.
7. Reconfirm the malfunction symptom and carry out

a test drive with the drive cycle pattern.

8. If DTC is set again, carry out an inspection with

the inspection procedure for diagnostic trouble
codes of that code.

9. If DTC is not set again, the malfunction is

intermittent. For information on how to cope with
intermittent malfunctions, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points

−

How to cope with Intermittent

Malfunction

P.00-8

10.After repairs are completed, conduct a road test

duplicating the complaint set conditions to confirm
the malfunction has been eliminated.

NOTE: If the powertrain control module (PCM) is
replaced, the immobilizer-ECU should be replaced
together with it. Each PCM has an individual
information for immobilizer-ECU, and the individual
information is registered in the immobilizer-ECU.

TROUBLE CODE DIAGNOSIS

M1131008600090

SERVICE ENGINE SOON/MALFUNCTION INDICATOR
LAMP
Among the on-board diagnostic items, a Service Engine Soon/
Malfunction Indicator Lamp illuminates to notify the driver of an
emission control malfunction.
However, when an irregular signal returns to normal and the
engine control module judges that it has returned to normal, the
Service Engine Soon/Malfunction Indicator Lamp is switched
off.
Moreover, when the ignition switch is turned off, the lamp is
switched off. Even if the ignition switch is turned on again, the
lamp does not illuminate until the malfunction is detected.
Immediately after the ignition switch is turned on, the Service
Engine Soon/Malfunction Indicator Lamp is lit for five seconds
to indicate that the Service Engine Soon/Malfunction Indicator
Lamp operates normally.

Items Indicated by the Service Engine Soon/Malfunction Indicator Lamp

AK000605AB

SERVICE ENGINE SOON/
MALFUNCTIONINDICATOR LAMP

DTC NO.

ITEMS

-

Powertrain control module (PCM) malfunction

P0101

Volume air flow circuit range/performance problem

P0102

Volume air flow circuit low input

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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P0103

Volume air flow circuit high input

P0107

Barometric pressure circuit low input

P0108

Barometric pressure circuit high input

P0111

Intake air temperature circuit range/performance problem

P0115

Engine coolant temperature circuit high input

P0116Engine coolant temperature circuit range/performance problem

P0117

Engine coolant temperature circuit low input

P0121

Throttle position circuit range/performance problem

P0122

Throttle position circuit low input

P0123

Throttle position circuit high input

P0128

Coolant thermostat malfunction

P0130

O

2

sensor circuit malfunction (sensor 1)

P0133

O

2

sensor circuit slow response (sensor 1)

P0134

O

2

sensor circuit no activity detected (sensor 1)

P0135

O

2

sensor heater circuit malfunction (sensor 1)

P0136O

2

sensor circuit malfunction (sensor 2)

P0139

O

2

sensor circuit slow response (sensor 2)

P0141

O

2

sensor heater circuit malfunction (sensor 2)

P0171

System too lean

P0172

System too rich

P0201

Injector circuit malfunction-cylinder 1

P0202

Injector circuit malfunction-cylinder 2

P0203

Injector circuit malfunction-cylinder 3

P0204

Injector circuit malfunction-cylinder 4

P0300

Random misfire detected

P0301

Cylinder 1 misfire detected

P0302

Cylinder 2 misfire detected

P0303

Cylinder 3 misfire detected

P0304

Cylinder 4 misfire detected

P0335

Crankshaft position sensor circuit malfunction

P0340

Camshaft position sensor circuit malfunction

P0401

Exhaust gas recirculation flow insufficient detected

P0403

Exhaust gas recirculation solenoid malfunction

P0421

Warm up catalyst efficiency below threshold (bank 1)

P0442

Evaporative emission control system leak detected

P0443

Evaporative emission control system purge control valve circuit malfunction

P0446Evaporative emission control system vent control malfunction

P0450

Evaporative emission control system pressure sensor malfunction

P0451

Evaporative emission control system pressure sensor range/performance

DTC NO.

ITEMS

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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NOTE: If the Service Engine Soon/Malfunction Indicator Lamp illuminates because of a malfunction of the
powertrain control module (PCM), transmission between scan tool MUT-II (MB991502) and the PCM is
impossible. In this case, the diagnostic trouble code (DTC) cannot be read.

NOTE: After the PCM has detected a malfunction, the Service Engine Soon/Malfunction Indicator Lamp
illuminates when the engine is next turned on and the same malfunction is re-detected.

NOTE: After the Service Engine Soon/Malfunction Indicator Lamp illuminates, it will be switched off under the
following conditions.

.

•

When the PCM monitored the power train malfunction three times* it met set condition requirements, it
detected no malfunction. *: In this case, "one time" indicates from engine start to stop.

•

For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant
temperature, etc.) are similar to those when the malfunction was first recorded.

NOTE: 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.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODE

Required Special Tool:
MB991502: Scan Tool (MUT-II)

P0455

Evaporative emission control system leak detected (Gross leak)

P0500

Vehicle speed sensor malfunction

P0506Idle control system RPM lower than expected

P0507

Idle control system RPM higher than expected

P0551

Power steering pressure sensor circuit range/performance

P0705

Transmission range sensor circuit malfunction (RPNDL input)

P0710

Transmission fluid temperature sensor circuit malfunction

P0715

Input/Turbine speed sensor circuit malfunction

P0720

Output speed sensor circuit malfunction

P0725

Engine speed input circuit malfunction

P0740

Torque converter clutch system malfunction

P0750

Shift solenoid A malfunction

P0755

Shift solenoid B malfunction

P0760

Shift solenoid C malfunction

P0765

Shift solenoid D malfunction

P1400

Manifold differential pressure sensor circuit malfunction

P1751

A/T control relay malfunction

DTC NO.

ITEMS

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.

NOTE: If Battery positive voltage is low, diagnostic trouble
codes may not be output. Be sure to check the battery and
charging system before continuing.

NOTE: If battery cable is disconnected or if the powertrain
control module (PCM) connector is disconnected, the
diagnostic trouble codes will be erased. Do not disconnect the
battery cable or PCM connector until the diagnostic trouble
codes have been recorded.

NOTE: If a DTC is erased, its "freeze frame" data will be also
erased and the readiness test status will be reset. If necessary,
store the "freeze frame" data before erasing the DTC.
1. Connect scan tool MB991502 to the data link connector.

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

3. Read the diagnostic trouble codes for MFI.

4. Refer to the DIAGNOSTIC TROUBLE CODE

CHART(

P.13A-20

).

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

then back to "ON" again.

6. Erase the diagnostic trouble code(s) using MUT-II screen

prompts.

7. Confirm that the diagnostic trouble code output is normal.

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

9. Disconnect scan tool MB991502 from the data link

connector.

PROVISIONAL DTCs [MUT-II OBD-II Test Mode

−−−−

Results (Mode 5)]

The MUT-II will display the Provisional DTCs reported by
powertrain control module (PCM) if the PCM 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 MIL will be
illuminated and a DTC will set.

MODE 6 REFERENCE TABLE

The powertrain control module (PCM) 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 PCM monitors can be confirmed. The value at the last
monitoring is output by PCM as a test result.

AC003081 AB

16 PIN

MB991502