Mitsubishi Eclipse. Manual — part 543
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-715
OVERVIEW OF TROUBLESHOOTING
• The DTC P0453 can be set if either of the follow-
ing conditions occur:
1. Faulty fuel differential pressure sensor,
related circuit, or ECM <M/T> or PCM <A/T>.
• To check a system blockage, do a performance
test which uses a mechanical vacuum gauge and
scan tool MB991958 set on the fuel tank differen-
tial pressure sensor (TANK PRS SNSR 73.) The
mechanical gauge reading is used to verify scan
tool MB991958 reading. A comparison of the
mechanical gauge to scan tool MB991958 deter-
mines the problem in the system.
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991658: Test Harness Set
• MB991709: Test Harness Set
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-716
STEP 1. Using scan tool MB991958, check data list item 73:
Fuel Tank Differential Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Disconnect hose I from the evaporative emission canister
side, and plug the hose from which the pipes have been
disconnected.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode for item
73, Fuel Tank Differential Pressure Sensor.
• The fuel tank pressures should be −1.5 to 1.5 kPa
(
−0.443 to 0.443 inHg.)
(6) Connect an evaporative emission system pressure pump to
the fuel filler neck, and apply pressure.
• The scan tool reading should increase.
(7) Turn the ignition switch to the "LOCK" (OFF) position. Then
disconnect scan tool MB991958.
Q: Is the scan tool reading within the specified value?
YES : Go to Step 22.
NO : Go to Step 2.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
AC002072 AB
HOSE I
AC000186
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-717
STEP 2. Check the output circuit voltage at intermediate
connector D-16.
(1) Remove the rear seat cushion. (Refer to GROUP 52A, Rear
.)
(2) Remove the protector.
(3) Disconnect intermediate connector D-16.
(4) Use special tools (MB991658 and MB991709) to connect
terminals 5, 6 and 8 between connectors of the
intermediate connector respectively.
(5) Turn the ignition switch to the "ON" position.
(6) Remove the fuel cap.
(7) Measure the voltage between terminal 5 and ground.
• Voltage should be between 2.0 and 3.0 volts.
(8) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Remove the special tools and connect intermediate
connector D-16. Then go to Step 3 .
NO : Go to Step 6.
STEP 3. Check the output circuit voltage at ECM connector
C-62 <M/T> or PCM connector C-59 <A/T> by backprobing.
(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 voltage normal?
YES : Go to Step 21.
NO : Go to Step 4.
AC002079 AB
MB991709
MB991658
AC002082
HARNESS SIDE
CONNECTOR
<A/T>
C-59
<M/T>
C-62
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-718
STEP 4. Check connectors C-28, C-90, D-16 at intermediate
connector and C-62 at ECM <M/T> or C-59 at PCM <A/T>
for damage.
Q: Are the connectors in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
AC001741 AJ
CONNECTOR: C-28
AC001991
CONNECTOR: C-90
CONNECTOR
BLOCK (LH)
AI
AC001787AD
CONNECTOR: D-16
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
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