Mitsubishi Galant 9G. Manual — part 1086
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-644
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.
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
.
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
.
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 3.
NO : Go to Step 2.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-645
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
, DTC P0107
− Manifold Absolute Pressure
Sensor Circuit Low Input
, DTC P0108
−
Manifold Absolute Pressure Sensor Circuit High Input
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
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0401 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-646
DTC P0403: Exhaust Gas Reculation Control Circuit
RED-
WHITE
RED-
WHITE
RED
RED-BLA
C
K
RED-
WHITE
RED-
WHITE
BR
O
W
N-WHITE
GRA
Y
-BLUE
BLA
CK-YELLO
W
AK400915
MFI RELAY
BATTERY
1
2
4
3
B-17X
B-105
(MU802056)
5
2
142
136
130
124
1
3
4
6
EXHAUST GAS
RECIRCULATION (EGR)
VALVE
POWERTRAIN
CONTROL
MODULE (PCM)
EGR Valve Circuit
1
2 3
4
5 6
B-23
1
2
3
4
121 122 123 124 125 126 127
128 129 130 131 132 133
134 135 136 137 138 139 140
141 142 143 144 145 146
147 148 149 150 151 152 153
TO PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-647
.
CIRCUIT OPERATION
• The EGR valve power is supplied from the MFI
relay (terminal No. 4).
• The PCM (terminals No. 124, No. 130, No. 136,
No. 142) drives the stepper motor by sequentially
turning "ON" the power transistors in the PCM
and providing ground to the idle air control motor
(terminal No. 1, No. 3, No. 4, No. 6).
.
TECHNICAL DESCRIPTION
• To judge if there is open circuit in the EGR valve
(stepper motor) drive circuit, PCM measure the
surge voltage of the EGR valve motor coil.
.
DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after stepper motor is oper-
ated on to off.
.
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 position sensor
.
AK303136AB
B-105(GR)
CONNECTOR: B-105
EGR
VALVE
BRAKE FLUID
RESERVOIR
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
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