Mitsubishi Eclipse. Manual — part 564
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-799
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 : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-800
DTC P0507: Idle Control System RPM Higher Than Expected
AK101629
1 2
4 5 6
3
RED
-
WHITE
RED
-
WHITE
RED
-
WHITE
RED
RED
RED
GREEN-BL
ACK
GREEN-RED
GREEN-
WHITE
BL
ACK
-YELL
OW
B-34
IDLE AIR
CONTROL (IAC)
MOTOR
BATTERY
MFI
RELAY
1
4
2
3
3
1
2
4
5
6
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
14
28
15
29
C-51 <M/T>, C-52 <A/T>
(MU803784)
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
3132 33
34 35
1
10
Idle Air Control (IAC) Motor Circuit
3 4
1 2
A-18X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-801
.
CIRCUIT OPERATION
• The idle air control motor power is supplied from
the MFI relay (terminal No. 4).
• The ECM (terminals No. 14, No. 15, No. 28, No.
29) <M/T> or PCM (terminals No. 14, No. 15, No.
28, No. 29) <A/T> drives the stepper motor by
sequentially turning "ON" the power transistors in
the ECM <M/T> or PCM <A/T> and providing
ground to the idle air control motor (terminals 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 ECM <M/T> or PCM <A/T> checks the differ-
ence 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
.
AK300084
IDLE AIR
CONTROL
MOTOR
CONNECTOR: B-34
AB
B-34 (B)
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300091
CONNECTOR: C-51 <M/T>
ECM
AF
C-51 (GR)
AK300244
CONNECTOR: C-52 <A/T>
AC
PCM
C-52 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-802
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Vehicle speed has reached 1.5 km/h (0.93 mph)
or more at least once.
• Under the closed loop idle speed control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Battery positive voltage is higher than 10 volts.
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• Intake air temperature is higher than −10°C
(14
°F).
• 60 seconds have elapsed from the start of the
previous monitoring.
• Target idle air control motor position is 0 steps.
Judgment Criteria
• Actual idle speed has continued to be higher than
the target idle speed by 200 r/min (300 r/min*) or
more for 12 seconds.
*: Specs in parentheses are applicable if the max-
imum air temperature during the previous opera-
tion was more than 45
°C (113°F).
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Idle air control motor failed.
• Open or shorted idle air control motor circuit, or
harness damage, or connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>
• Intake system vacuum leak.
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
START
CALCULATE
Ne
MONITORING
CONDITIONS
Ne = (ACTUAL-Ne) - (TARGET-Ne)
Ne: ENGINE SPEED
Ne < -100 r/min OR
> 200 r/min
HAVE 10secs PASSED?
AK204002
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