Mitsubishi Montero Sport (2004+). Manual — part 309
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-649
STEP 12. Check for harness damage between MFI relay
connector C-59 (terminal No. 1) and idle air control motor
connector A-40 (terminals No. 2, No. 5).
Q: Is the harness wire in good condition?
YES : Go to Step 13.
NO : Repair it. Then go to Step 14.
STEP 13. Check for harness damage between idle air
control motor connector A-40 and PCM connector C-89.
a. Idle air control motor connector A-40 (terminal No. 1) and
PCM connector C-89 (terminal No. 14).
b. Idle air control motor connector A-40 (terminal No. 3) and
PCM connector C-89 (terminal No. 28).
c. Idle air control motor connector A-40 (terminal No. 4) and
PCM connector C-89 (terminal No. 15).
d. Idle air control motor connector A-40 (terminal No. 6) and
PCM connector C-89 (terminal No. 29).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
AK200023
2 1
3
4
CONNECTOR: C-59
AB
C-59
HARNESS
CONNECTOR:
COMPONENT
SIDE
AK200476
1
2
3
4
5
6
AB
CONNECTOR: A-40
A-40(B)
HARNESS
CONNECTOR:
COMPONENT
SIDE
AK200476
1
2
3
4
5
6
AB
CONNECTOR: A-40
A-40(B)
HARNESS
CONNECTOR:
COMPONENT
SIDE
AK103914
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
CONNECTOR: C-89
C-89(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-650
STEP 14. 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
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0506 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-651
DTC P0507: Idle Control System RPM Higher than Expected
WHITE-
BLA
CK
WHITE-
BLA
CK
WHITE-
BLA
CK
RED
RED
RED
GREEN-BLA
CK
GREEN-BLUE
GREEN
GREEN-RED
AK200194
Idle Air Control (IAC) Motor Circuit
2
3
4
FUSIBLE LINK (12)
1
12
2
5
17
18
6
4
3
1
MFI
RELAY
14
28
15
29
IDLE AIR
CONTROL
(IAC) MOTOR
POWERTRAIN CONTROL MODULE (PCM)
C-59
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-14
10
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24
25
26 27 28 29
31 32 33
34 35
1
C-89
(MU803784)
2
4 5 6
3
1
A-40
JOINT
CONNECTOR (5)
1
2
3
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-652
.
CIRCUIT OPERATION
• The idle air control (IAC) motor power is supplied
from the MFI relay (terminal No. 1).
• The PCM (terminals No. 14, No. 15, No. 28, No.
29) 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-
minals No. 1, No. 3, No. 4, No. 6).
.
TECHNICAL DESCRIPTION
• The amount of air taken in during idling is regu-
lated by the opening and closing of the servo
valve located in the air passage that bypasses
the throttle body.
• If there is a malfunction of the IAC system, the
actual engine speed will not be identical to the
target engine speed.
• The PCM checks the difference between the
actual engine speed and the target engine speed.
.
DESCRIPTIONS OF MONITOR METHODS
Difference between actual and target idle speed is
over the specified value.
.
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)
• Misfire monitor
• Exhaust gas recirculation (EGR) system monitor
• Fuel system 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
.
AK200029 AB
CONNECTOR: A-40
IDLE AIR CONTROL MOTOR
A-40(B)
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK103911AB
CONNECTOR: C-14
C-14
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
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