Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 278

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-311

STEP 9. Check the output voltage at fuel tank differential
pressure sensor connector D-18.
(1) Disconnect fuel tank differential pressure sensor connector

D-18.

(2) Use special tool (MB991658) to connect terminals 2 and 3

of the disconnected sensor connector and those of the
harness side connector, respectively.

(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Measure the voltage between terminal 1 and ground by

backprobing.

•

Voltage should be between 2.0 and 3.0 volts.

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

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

YES : Check connectors D-16, C-90, C-28, C-62 <M/T> or

C-59 <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-62 <M/T>

or C-59 <A/T> are in good condition, check the
harness between fuel tank differential pressure
sensor connector D-18 and ECM connector C-62 <M/
T> or PCM connector C-59 <A/T> for short circuit to
ground, then repair if necessary. Then go to Step 26.

NO : Replace the fuel tank differential pressure sensor.

Then go to Step 26.

STEP 10. Check the output circuit voltage at ECM
connector C-62 <M/T> or PCM connector C-59 <A/T>.
(1) Do not disconnect the ECM connector C-62 <M/T> or PCM

connector C-59 <A/T>.

(2) Turn the ignition switch to the "ON" position.
(3) Remove the fuel cap.
(4) Measure the voltage between terminal 93 <M/T> or terminal

92 <A/T> and ground by backprobing.

•

Voltage should be between 2.0 and 3.0 volts.

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

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

YES : Go to Step 18.
NO : Check connectors D-16, C-90, C-28, C-62 <M/T> or

C-59 <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-62 <M/T>

or C-59 <A/T> are in good condition, check the
harness between intermediate connector D-16 and
ECM connector C-62 <M/T> or PCM connector C-59
<A/T> for open circuit or damage. Then repair if
necessary. Then go to Step 26.

ACX01760AB

MB991658

FUEL TANK DIFFERENTIAL

PRESSURE SENSOR

AC002082

HARNESS SIDE
CONNECTOR

<A/T>
C-59

<M/T>
C-62

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-312

STEP 11. Check the 5-volt supply 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 42 <M/T> or terminal

46 <A/T> and ground by backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the multi-meter reading within 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 GROUP00E, 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 12.

STEP 12. 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 : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 26.

NO : Go to Step 13.

STEP 13. Check the sensor power supply line for short
circuit to ground at ECM connector C-58 <M/T> or PCM
connector C-55 <A/T>.
(1) Disconnect ECM connector C-58 <M/T> or PCM connector

C-55 <A/T> and measure at the harness side.

(2) Check for the continuity between terminal 42 <M/T> or

terminal 46 <A/T> and ground.

•

There should be 2 ohms or more.

Q: Does the multi-meter reading exceed the specified

value?
YES : Replace ECM or PCM. Then go to Step 26.
NO : Go to Step 14.

AC002083AC

HARNESS SIDE
CONNECTOR

<M/T> C-58

<A/T> C-55

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>

AC002084 AC

<M/T> C-58

<A/T> C-55

HARNESS SIDE
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-313

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>

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

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>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-314

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>

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