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Mitsubishi Outlander GS45X. Manual - part 882

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-461

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• At least 15 seconds have passed since the last

monitor was complete.

• Engine coolant temperature is higher than 76°C

(169

°F).

• Engine speed is at between 906 and 2,500 r/min.

• Intake air temperature is higher than −10°C

(14

°F).

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• Fuel is being shut off.

• Vehicle speed is 30 km/h (19 mph) or more.

• At least 90 seconds have passed since manifold

absolute pressure sensor output voltage fluctu-
ated 1.5 volts or more.

• Battery positive voltage is higher than 10.3 volts.

• The accelerator pedal is closed.

• Volumetric efficiency is lower than 28 percent.

Start

End

Yes

Malfunction

Good

Monitoring

conditions

Measure manifold

pressure (P1)

Measure manifold

pressure (P2)

EGR valve open

P2 - P1 < P0 *

Specified

times

AK604336

P0 : Threshold value

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-462

• The ECM monitors for this condition for 3 cycles

of 2.2 seconds each during the drive cycle.

Judgement Criterion

• When the EGR valve opens to the prescribed

opening, when intake manifold pressure fluctua-
tion width is lower than 2.0 kPa (0.59 in.Hg).

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 3

P.13B-11

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

• EGR valve (stepper motor) failed.

• Open or shorted EGR valve (stepper motor) cir-

cuit, or connector damage.

• Manifold absolute pressure sensor failed.

• ECM failed.

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. Using scan tool MB991958, check data list item 8:
Manifold Absolute Pressure Sensor.

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) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

8, Manifold Absolute Pressure Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C

to 95

°C (176°F to 203°F).

• Should be between 16 − 36 kPa (4.7 − 10.6 in.Hg) at

engine idling.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Clean the EGR valve and EGR passage. Then go to

Step 2.

NO : Refer to DTC P0106

− Manifold Absolute Pressure

Sensor Circuit Range/Performance Problem

P.13B-150

, DTC P0107

− Manifold Absolute Pressure

Sensor Circuit Low Input

P.13B-156

, DTC P0108

−

Manifold Absolute Pressure Sensor Circuit High Input

P.13B-162

STEP 2. Check the EGR system
Refer to GROUP 17, Emission Control

− Exhaust Gas Recircu-

lation (EGR) System

− General Information (Exhaust Gas

Recirculation)

P.17-80

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 4.
NO : Go to Step 3.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-463

STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 3

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0401 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

. Then go to Step 4.

NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-15

STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Pattern 3

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0401 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

DTC P0421: Warm Up Catalyst Efficiency Below Threshold (bank 1)

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-464

• Accelerator pedal position sensor

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 right bank heated oxygen sensor (rear)

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

• The right bank heated oxygen sensor (rear) sig-

nal frequency divided by the right 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).

Start

Monitoring

conditions

Malfunction

Good

End

Yes

Rf > R0

Calculate average frequency

ratio (Rf = Fr/Ff) of specified times

R0: Average threshold value

AK604337

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