Mitsubishi Montero (2004+). Manual — part 254
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-503
STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− 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.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-504
DTC P0403: Exhaust Gas Reculation Control Circuit
WHITE-
BLA
C
K
WHITE-
BLA
C
K
RED
GREEN-BLA
C
K
RED
RED
GREEN-RED
BLUE-ORANGE
BLA
CK-YELLO
W
AK201148
MFI RELAY
BATTERY
3
2
1
4
3 4
1 2
B-22X
B-56
(MU802056)
2
5
3
12
19
26
1
3
4
6
EGR
VALVE
POWERTRAIN
CONTROL
MODULE (PCM)
EGR Valve Circuit
1
2 3
4
5 6
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-505
.
CIRCUIT OPERATION
• The EGR valve power is supplied from the MFI
relay (terminal No. 1).
• The PCM (terminals No. 3, No. 12, No. 19, No.
26) drives the stepper motor by sequentially turn-
ing "ON" the power transistors in the PCM and
providing ground to the idle air control motor (ter-
minal 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)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
• Manifold absolute pressure sensor
.
AK200966
EGR
VALVE
AB
B-56(GR)
CONNECTOR: B-56
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-506
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.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
START
END
MALFUNCTION
GOOD
MONITORING
CONDITIONS
WAS SURGE VOLTAGE
(> V
B
+2V) DETECTED?
NO
NO
YES
YES
AK302951
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