Mitsubishi Outlander GS45X. Manual — part 896
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-517
.
CIRCUIT OPERATION
• The ECM (terminal No. 114) supplies a 5-volt ref-
erence signal to the fuel tank differential pressure
sensor (terminal No. 3). The fuel tank differential
pressure sensor (terminal No. 2) is grounded
through the ECM (terminal No. 113).
• The fuel tank differential pressure sensor (termi-
nal No. 1) returns a voltage signal to the ECM
(terminal No. 112) that is proportional to the pres-
sure in the fuel tank.
.
TECHNICAL DESCRIPTION
• The ECM monitors the fuel tank differential pres-
sure sensor output voltage.
• The ECM determines whether the fuel tank differ-
ential pressure sensor signal voltage is within
normal operating parameters.
.
DESCRIPTIONS OF MONITOR METHODS
• Compare purge solenoid status with fuel tank dif-
ferential pressure sensor output voltage.
.
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)
• Evaporative emission purge solenoid monitor
• Evaporative emission ventilation solenoid monitor
• Fuel temperature sensor monitor
• Fuel level sensor monitor
Sensor (The sensors below are determined to be
normal)
• Mass airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
• Accelerator pedal position sensor
.
AK704189
Fuel tank differential
pressure sensor
D-19
Connector: D-19
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-518
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
Judgement Criteria
• The fuel tank differential pressure sensor output
voltage remains 0.2 volt or less for 5 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Connector damage.
• Harness damage.
• Fuel tank differential pressure sensor failed.
• ECM failed.
.
OVERVIEW OF TROUBLESHOOTING
• DTC P0452 can be set by a faulty fuel tank differ-
ential pressure sensor or related circuit, or ECM
failure.
AK704187
No
End
No
No
Malfunction
Good
No
Start
Monitoring
conditions
Output voltage
< 0.2v
Output voltage
> 4.8v
Yes
Yes
Yes
Yes
Continuous
failure for 5 secs
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-519
• To check for 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 (52: Fuel tank differential
PRS. SNSR). The mechanical gauge reading is
used to verify scan tool MB991958 reading. A
comparison of the mechanical gauge with the
reading on scan tool MB991958 will locate a
problem in the system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
• MB992110: Power Plant ECU Check Harness
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-520
STEP 1. Using scan tool MB991958, check data list item 52:
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 C from the evaporative emission canister,
and plug the hose.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.
• Item 52, Fuel Tank Differential Pressure Sensor.
• The fuel tank pressure reading on the scan tool
should be 1,500 to 3,500 mV.
(6) Connect the evaporative emission system pressure pump
(Miller number 6872A) to the fuel tank filler tube by using
fuel tank adapter (MLR-8382) and pressurize the fuel tank.
• The fuel tank pressure reading should increase.
(7) Turn the ignition switch to the "LOCK" (OFF) position. Then
disconnect scan tool MB991958.
(8) Remove the evaporative emission system pressure pump
(Miller number 6872A) and the fuel tank adapter
(MLR-8382), and reinstall the fuel cap.
(9) Connect hose C to the evaporative emission canister.
Q: Is the fuel tank pressure between 1,500 and 3,500 mV?
YES : It can be assumed that this malfunction is intermittent
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
).
NO : Go to Step 2 .
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
AK704159
Hose C
Plug
AB
AK704160
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