Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 282

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-327

STEP 14. Check the sensor power supply lines.
(1) Check all the sensor power supply lines for damage, which

flow through the harness ECM connector (terminal 42) <M/
T> or PCM connector (terminal 46) <A/T>.

Q: Is there any failure in the sensor power supply lines?

When a failure is found : Repair if necessary. (Refer to

GROUP 90, Circuit Diagrams

−

MFI System <M/T>

P.90-56

, <A/T>

P.90-66

. Then go to Step 26.)

STEP 15. Check the ground circuit voltage at ECM
connector C-58 <M/T> or PCM connector C-55 <A/T>.
(1) Do not disconnect ECM connector C-58 <M/T> or PCM

connector C-55 <A/T>.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 49 <M/T> or 57 <A/

T> and ground by backprobing.

•

Voltage should be 0.5 volts or less.

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

Q: Is the multi-meter reading below the specified value?

YES : Check connectors D-16, C-90, C-28, C-58 <M/T> or

C-55 <A/T> and repair or replace as required. Refer
to GROUP 00E, Harness Connector Inspection

P.00E-2

. If connectors D-16, C-90, C-28, C-58 <M/T>

or C-55 <A/T> are in good condition, check the
harness between intermediate connector D-16 and
ECM connector C-58 <M/T> or PCM connector C-55
<A/T> for open circuit or damage. Then repair if
necessary. Then go to Step 26.

NO : Go to Step 16.

STEP 16. Check ECM connector C-58 <M/T> or PCM
connector C-55 <A/T> for damage.
(1) Disconnect ECM connector C-58 <M/T> or PCM connector

C-55 <A/T>.

Q: Is there any failure at ECM connector C-58 <M/T> or

PCM connector C-55 <A/T>?
YES : Replace ECM or PCM. Then go to Step 26.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 26.

AC002085

HARNESS SIDE
CONNECTOR

<M/T> C-58

<A/T> C-55

AC

AC001689

CONNECTOR: C-58 <M/T>, C-55 <A/T>

ECM <M/T>
OR
PCM <A/T>

C-58
<M/T>

C-55
<A/T>

AO

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-328

STEP 17. Check the harness between fuel tank differential
pressure sensor connector D-18 and intermediate
connector D-16 for open circuit or damage.
(1) Disconnect fuel tank differential pressure sensor connector

D-18 and intermediate connector D-16.

Q: Is there any failure between fuel tank differential

pressure sensor connector D-18 and intermediate
connector D-16?
YES : Repair it. Then go to Step 26.
NO : Check connectors D-18, D-16 and repair or replace

as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. Then go to Step 26.

STEP 18. Check ECM connector C-62 <M/T> or PCM
connector C-59 <A/T> for damage.
(1) Disconnect ECM connector C-62 <M/T> or PCM connector

C-59 <A/T>.

Q: Is there any failure at ECM connector C-62 <M/T> or

PCM connector C-59 <A/T>?
YES : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 26.

NO : Go to Step 19.

AC002041AB

CONNECTOR: D-18

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

AC002549 AB

CONNECTOR: D-16

INTERMEDIATE
CONNECTOR

AC001689

CONNECTOR: C-62<M/T>, C-59 <A/T>

ECM <M/T>
OR
PCM <A/T>

C-62
<M/T>

C-59
<A/T>

AP

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-329

STEP 19. Using scan tool MB991502, check data list item
73: Fuel Tank Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Remove the fuel cap.
(4) Set scan tool MB991502 to the data reading mode for item

73, Fuel Tank Differential Pressure Sensor.

•

The fuel tank pressures should be

−

1.5 to 1.5kPa.

(5) Connect an evaporative emission system pressure pump to

the fuel filler neck, and apply pressure.

•

The scan tool reading should increase.

Q: Is the scan tool reading within the specified value?

YES : Go to Step 26.
NO : Replace the ECM or PCM. Then go to Step 26.

STEP 20. Check for clogging in the evaporator line from
hose G to hose I and from hose L to hose P.
(1) Remove the module bracket mounting bolts, and

disconnect hose G from the evaporative emission
ventilation solenoid side, and plug the hoses from which the
hoses have been disconnected.

(2) Install the EVAP pressure pump outlet hose to the fuel tank

filler neck as described in the pump manufacturer's
instructions.

(3) On the EVAP pressure pump, set the pressure/hold valve to

OPEN, and set the vent valve to CLOSED.

(4) Turn the pump timer to ON. You can reset the timer as

required. (These settings are listed under "Leak Test" in the
pump instructions.)

(5) When the hose G is unplugged, the air passes through the

hose G.

Q: Does air pass through the hose G?

YES : Go to Step 21.
NO : Go to Step 23.

AC001252

MB991502

16 PIN

AB

AC000186

AC002028 AB

HOSE G

OPEN

OPEN

CLOSED

CLOSED

Pressure
Hold

Vent

ACX01806

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-330

STEP 21. Check the vent valve module for clogging.
(1) Check the over vent valve module for clogging. (Refer to

GROUP 17

−

Vent Valve

P.17-103

.)

Q: Air there any clogs?

YES : Replace the vent valve module. Then go to Step 26.
NO : Go to Step 22.

STEP 22. Check for clogging in the evaporator line from
hose Q and hose R.
(1) Apply vacuum with a hand vacuum pump connected to

hose Q and hose R.

Q: Are there any clogs?

YES : Replace that hose. Then go to Step 26.
NO : Go to Step 23.

STEP 23. Check for clogging in the evaporator lines I.
(1) Apply vacuum with a hand vacuum pump connected to

hose I.

Q: Are there any clogs?

YES : Replace that hose. Then go to Step 26.
NO : Go to Step 24.

AC002034 AB

AC002072 AB

HOSE I

AC002033

HOSE R

AC

HOSE Q

AC002072 AB

HOSE I