Mitsubishi Galant (2004+). Manual — part 1233
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-625
DTC P0403: Exhaust Gas Reculation Control Circuit
RED-
WHITE
RED-
WHITE
RED
RED-BLA
CK
RED-
WHITE
RED-
WHITE
BR
O
WN-WHITE
GRA
Y
-BLUE
BLA
CK-YELLO
W
AK302860
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
RED-
WHITE
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-626
.
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-627
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Battery positive voltage is higher than 10.3 volts.
• In a few seconds, just after ignition switch is
turned to the "ON" position from the
"LOCK"(OFF) position. (While EGR valve is ini-
tialized.)
Judgment Criteria
• The EGR valve motor coil surge voltage (battery
positive voltage +2 volts) is not detected for 3
seconds.
Check Conditions
• Battery positive voltage is higher than 10.3 volts.
• EGR valve is in operation after the engine start-
ing process is complete.
Judgment Criteria
• The EGR valve motor coil surge voltage (battery
positive voltage +2 volts) is not detected for 30
seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
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, harness damage or connector damage.
• PCM failed.
START
END
MALFUNCTION
GOOD
MONITORING
CONDITIONS
WAS SURGE VOLTAGE
(> V
B
+2V) DETECTED?
NO
NO
YES
YES
AK204017
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-628
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness Set
• MB991923: Power Plant ECU Check Harness
STEP 1. Check harness connector B-105 at EGR valve for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
1
2 3
4
5 6
AK303137AB
B-105(GR)
CONNECTOR: B-105
EGR
VALVE
BRAKE FLUID
RESERVOIR
HARNESS
CONNECTOR:
COMPONENT SIDE
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