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Mitsubishi Outlander GS45X. Manual - part 883

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-465

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Replace the right bank side catalytic converter.
(1) Replace the catalytic converter.
(2) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 4

P.13B-11

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0421 set?

YES : Replace the ECM. When the ECM is replaced,

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

NO : The inspection is complete.

DTC P0431: Warm Up Catalyst Efficiency Below Threshold (bank 2)

TECHNICAL DESCRIPTION

• The signal from the rear heated oxygen sensor

differs from the front heated oxygen sensor,
because the catalytic converter purifies exhaust
gas. When the catalytic converter has deterio-
rated, the signal from the front heated oxygen
sensor becomes similar to the rear heated oxy-
gen sensor.

• The ECM compares the output of the front and

rear heated oxygen sensor signals.

DESCRIPTIONS OF MONITOR METHODS

Front and rear heated oxygen sensor rich/lean

switching frequencies are nearly equal.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Heated oxygen sensor (front) monitor

• Heated oxygen sensor (rear) monitor

• Heated oxygen sensor (front) heater monitor

• Heated oxygen sensor (rear) heater monitor

• Heated oxygen sensor (front) inactive monitor

• Heated oxygen sensor offset voltage monitor

• Misfire monitor

• Fuel system monitor

• Air/fuel ratio feedback monitor

Sensor (The sensor below is determined to be

normal)

• Mass airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

• Accelerator pedal position sensor

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-466

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine speed is lower than 3,500 r/min.

• Accelerator pedal is depressed.

• Mass airflow is between 14 and 41 g/sec.

• More than 3 seconds have elapsed after the

above-mentioned three conditions have been
met.

• Intake air temperature is higher than −10°C

(14

°F).

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• Under the closed loop air/fuel ratio control.

• Vehicle speed is 1.5 km/h (1.0 mph) or more.

• The ECM monitors for this condition for 5 cycles

of 12 seconds each during the drive cycle.

• Short-term fuel trim is higher than −25 percent

and lower than +25 percent.

• The cumulative mass airflow is higher than 1,638

Judgement Criteria

• When the left bank heated oxygen sensor (rear)

signal frequency is divided by the left bank
heated oxygen sensor (front) signal frequency,
the average is more than 0.7.

• The left bank heated oxygen sensor (rear) signal

frequency divided by the left bank heated oxygen
sensor (front) signal frequency is more than 0.2.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 4

P.13B-11

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )

• Catalytic converter deteriorated (Exhaust leak).

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

Start

Monitoring

conditions

Malfunction

Good

End

Yes

Rf > R0

Calculate average frequency

ratio (Rf = Fr/Ff) of specified times

R0: Average threshold value

AK604337

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-467

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Replace the left bank side catalytic converter.
(1) Replace the catalytic converter.
(2) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 4

P.13B-11

(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0431 set?

YES : Replace the ECM. When the ECM is replaced,

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

NO : The inspection is complete.

DTC P0441: Evaporative Emission Control System Incorrect Purge Flow

TECHNICAL DESCRIPTION

• ECM detects a stuck open condition of evapora-

tive emission purge solenoid valve and a stuck
closed condition of evaporative emission ventila-
tion solenoid valve by pressure change in fuel
tank.

• Stuck open evaporative emission purge solenoid

valve is judged through monitoring leak of evapo-
rative emission system.

• Stuck closed evaporative emission ventilation

solenoid valve is judged after 20 seconds from
end of monitoring leak of evaporative emission
system, or of usual operation of evaporative
emission purge solenoid from ON to OFF.

DESCRIPTIONS OF MONITOR METHODS

Fuel tank pressure decreases largely during

purge-cut.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Fuel tank pressure sensor monitor

Sensor (The sensor below is determined to be

normal)

• Not applicable

AK900147

B-07 (B)

Connector: B-07

Evaporative emission
purge solenoid

AK700418

Evaporative emission
ventilation solenoid

Spare tire

D-116 (B)

Connector: D-116

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-468

DTC SET CONDITION

Logic Flow Chart

Check Conditions

• ON duty cycle of the evaporative emission purge

solenoid is 0 percent.

• Engine is running.

• 20 seconds have elapsed since the duty cycle of

the evaporative emission purge solenoid has
turned to 0 percent.

Judgement Criterion

• The pressure in the fuel tank is −1,961 kPa

(

−0.58 in.Hg) or less for 0.1 second.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 5

P.13B-11

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )

• Evaporative emission purge solenoid failed.

• Evaporative emission ventilation solenoid failed.

• ECM failed.

• Purge line or vapor line seal is leaking.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

AK604338

Good

Malfunction

End

Fuel-tank pressure

< -1.96kPa (-0.58 in. Hg)

Reverting pressure

detected during

evap. monitor?

Start

Yes

Continuous

failure for 100msec

Monitoring conditions for

malfunction detection?

Monitoring conditions for

pass judgement?

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