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 

P.13B-7

.

(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 

− Other Monitor 

P.13B-7

.

.

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