Mitsubishi Eclipse. Manual - part 525

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-643

(2) Connect an evaporative emission system pressure pump to 

the leveling valve nipple.

(3) Plug the filler hose, feed pipe, return pipe and rollover valve 

nipple connected to the fuel tank.
NOTE: If these items are not securely plugged here, the 
fuel could leak in the next step.

(4) Apply pressure with the evaporative emission system 

pressure pump.

(5) In the pressurized state, check for the leak by applying soap 

water, etc. to each section.

Q: Is the fuel tank in good condition?

YES : Go to Step 16.
NO :  Replace the fuel tank, reinstall the fuel tank and fuel 

filler neck assembly. (Refer to GROUP 13C, Fuel 
Tank 

P.13C-13

.) Then go to Step 17.

AC000197

AC000198

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-644

STEP 16. Using scan tool MB991958, check evaporative 
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991958.

• With this monitor, the ECM <M/T> or PCM <A/T> auto-

matically increases the engine speed to 1,600 r/min or 
more. Check that the transaxle is set to "neutral" <M/T> 
or "P" <A/T> position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed. (Tighten until 

three clicks are heard.)

(5) Start the engine.
(6) Select "System Test," and press the "YES" key.
(7) Select "Evap Leak Mon," and press the "YES" key.
(8) During the monitor, keep the accelerator pedal at the idling 

position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjustment of the Speed Adjusting 
Screw may be needed. Refer to 

P.13B-1105

. And adjust to 

the standard value.

(9) Keep the engine speed and engine load within the specified 

range. When the monitor test starts, the "In Progress" item 
on the scan tool MB991958 will change from "NO" to "YES."

(10)Turn the ignition switch to the "LOCK" (OFF) position. Then 

disconnect scan tool MB991958.

Q: What is displayed on scan tool MB991958?

"Evap Leak Mon. Completed. Test Passed" : The 

evaporative emission system is working properly at 
this time. Then go to Step 17    .

"Evap Leak Mon. Completed. Test Failed and DTCs Set" 
: 

Replace the ECM <M/T> or PCM <A/T>. Then go to 
Step 17.

"Evap Lead Mon. discontinued. Retest again from the 
first" : The monitor was discontinued for a certain reason 

(vehicle speed input from ECM <M/T> or PCM <A/T>, 
engine speed and engine load deviating from 
specified range). Turn the ignition switch to the 
"LOCK" (OFF) position once, and recheck 
evaporative emission system monitor test.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-645

STEP 17. Test the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle  

(Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 1 

− Evaporative Emission System Leak Monitor 

P.13B-7

). 

(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0442 set?

YES : Go to Step 1.
NO :  This diagnosis is complete.

DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit

AK101615

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

2

1

BL

UE

BATTERY

MFI
RELAY

4

3

1

2

16 <M/T>
34 <A/T>

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

    B-33
MU802779

EVAPORATIVE EMISSION
PURGE SOLENOID

1

2

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

Evaporative Emission Purge Solenoid Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-646

.

CIRCUIT OPERATION

• Power to the evaporative emission purge sole-

noid power is supplied from the MFI relay (termi-
nal No. 4).

• The ECM <M/T> or PCM <A/T> controls ground 

evaporative emission purge solenoid by turning 
the power transistor in the ECM <M/T> or PCM 
<A/T> "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

emission purge solenoid drive circuit, ECM 
<M/T> or PCM <A/T> measures the surge volt-
age of the evaporative emission purge solenoid 
coil.

• The ECM <M/T> or PCM <A/T> drives the evapo-

rative emission purge solenoid. After the solenoid 
is turned off, the ECM <M/T> or PCM <A/T> will 
check if the solenoid coil produces a surge volt-
age of 2 volts or more.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after solenoid is operated 

from on to off.

.

MONITOR EXECUTION
Once per driving cycle

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK300069AB

CONNECTOR: B-33 <WITHOUT INTAKE 
MANIFOLD TUNING  SYSTEM>

EVAPORATIVE
EMISSION
PURGE
SOLENOID
VALVE

B-33 (B)

AK300077

CONNECTOR: B-33 <WITH INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

EVAPORATIVE
EMISSION PURGE
SOLENOID VALVE

B-33 (B)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X