Mitsubishi Galant (2004+). Manual - part 1232

 

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Mitsubishi Galant (2004+). Manual - part 1232

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-621

STEP 20. 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 − Procedure 6 − 

Other Monitor 

P.13B-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

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

DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

.

TECHNICAL DESCRIPTION

• When the EGR valve (stepper motor) is actuated 

from the fully closed position toward the open 
position while the engine is running, EGR gas 
flows.

• The PCM checks how the EGR gas flow signal 

changes.

.

DESCRIPTIONS OF MONITOR METHODS
Small manifold pressure change during exhaust gas 

recirculation (EGR) operation from closed to 
open.

.

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)

• EGR stepper motor 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

• Manifold absolute pressure sensor

• Accelerator pedal position sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-622

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• At least 14 seconds have passed since the last 

monitor was complete.

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Engine speed is at between 970 and 1,650 r/min.

• Intake air temperature is higher than −10°C 

(14

°F).

• Barometric pressure is higher than 76 kPa (22.4 

in.Hg).

• 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 throttle valve is closed.

• Volumetric efficiency is lower than 29 percent.

• The PCM monitors for this condition for 3 cycles 

of 1.8 seconds each during the drive cycle.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

MEASURE MANIFOLD

PRESSURE (P1)

MEASURE MANIFOLD

PRESSURE (P2)

EGR VALVE OPEN

P2 - P1 < P0 *

SPECIFIED TIMES

AK204016

P0 : THRESHOLD VALUE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-623

Judgement Criteria

• 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 − 

Procedure 5 

− Exhaust Gas Recirculation (EGR) 

System Monitor 

P.13B-5

.

.

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

• Contaminated EGR valve and EGR passage.

• EGR valve (stopper motor) failed.

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

cuit, or connector damage.

• Manifold absolute pressure sensor failed.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check the EGR system

Refer to GROUP 17, Emission Control System 

− Exhaust Gas 

Recirculation (EGR) System 

− General Information 

P.17-91

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 3.
NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, check data list item 95: 
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 

95, 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 3.

NO :  Refer to DTC P0106 

− Manifold Absolute Pressure 

Sensor Circuit Range/Performance Problem 

P.13B-68

, DTC P0107 

− Manifold Absolute Pressure 

Sensor Circuit Low Input 

P.13B-82

, DTC P0108 

− 

Manifold Absolute Pressure Sensor Circuit High Input 

P.13B-94

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-624

STEP 3. 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 − Procedure 5 − 

Exhaust Gas Recirculation (EGR) System Monitor 

P.13B-5

.

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

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

 

 

 

 

 

 

 

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