Mitsubishi Outlander XL. Manual — part 326
DTC SET CONDITIONS
Logic Flow Chart
ZK603435
Start
Off-idling condition
Idling condition?
F1 = 0
Off-idling condition
Yes
No
F2 = F2 + 1
End
No
Malfunction
F1 > 20
F2 > 8
FTPS output Voltage Fluctuation
> 0.2v
No
Yes
Yes
F1 = F1 + 1
Good
Logic Flow Chart
No
Yes
Yes
No
Yes
No
AA00
Check Conditions
⦆
Throttle valve is closed.
⦆
Vehicle speed is 1.5 km/h (0.93 mph) or less.
Judgement Criteria
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-499
DIAGNOSTIC TROUBLE CODE PROCEDURES
⦆
If the voltage signal from the fuel tank differential
pressure sensor changes by 0.2 volt or more, DTC
P0451 will set. The code may also set if a sudden
pressure fluctuation occurs twenty times while the
engine is idling, and then four consecutive times
during normal driving.
NOTE:
If the number of sudden pressure
fluctuations does not reach twenty during any
one period of engine idling, or if the ignition
switch is turned OFF, the counter will reset to
zero.
NOTE:
The conditions for deviating from idling
operation are as follows:
⦆
Vehicle speed is 50 km/h (31 mph) or greater.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-ll Drive Cycle -
Pattern 16 P.13Ab-8.
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 P0451 can be set by a faulty fuel tank
differential pressure sensor or related circuit, or
ECM failure.
⦆
To check for system blockage, do a performance
test which uses a mechanical vacuum gauge and
scan tool MB991958 set on the fuel tank differential
pressure sensor (TANK PRS SNSR 73). 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
13Ab-500
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
STEP 1. Using scan tool MB991958, check data list item 52:
Fuel Tank Differential Pressure Sensor.
ZC501967
AC404789
ZC501968
MB991824
MB991827
MB991910
Data link
connector
AA00
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.
(1)
Connect scan tool MB991958 to the data link connector.
ZK603402
Hose C
Plug
AA00
(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 2050 to 2950 mV.
ZK603403AA00
(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 2,050 and 2,950 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 P.00-15).
NO:
Go to Step 2.
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-501
DIAGNOSTIC TROUBLE CODE PROCEDURES
STEP 2. Check harness connector B-11 at ECM and harness
connector D-19 at fuel tank differential pressure sensor for
damage.
Q:Is the harness connector in good condition?
YES:
Then go to Step 3.
NO:
Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection P.00E-2. Then go to Step 7.
STEP 3. Measure the 5-volt reference signal at fuel tank
differential pressure sensor connector D-19.
(1)
Remove the second seat assembly (Refer to GROUP 52A,
Second Seat Assembly P.52A-21).
ZK603415
Floor inspection lid (LH)
AA00
(2)
Remove the floor inspection lid (LH).
(3)
Disconnect fuel tank differential pressure sensor connector
D-19.
(4)
Turn the ignition switch to the "ON" position.
ZK603416
1
2
3
AA00
D-19 Harness
connector:
component side
(5)
Measure the voltage between terminal 3 and ground.
⦆
The voltage should measure between 4.9 and 5.1 volts.
(6)
Turn the ignition switch to the "LOCK" (OFF) position.
Q:Is the measured voltage between 4.9 and 5.1 volts?
YES:
Go to Step 5.
NO:
Go to Step 4.
STEP 4. Measure the 5-volt reference signal at ECM
connector B-11 by using check harness special tool
MB992110.
ECM
ZK603234AA00
Body side harness
MB992110
(1)
Disconnect all ECM connectors. Connect the power plant
ECU check harness special tool MB992110 between the
separated connectors.
(2)
Turn the ignition switch to the "ON" position.
(3)
Remove the fuel cap.
13Ab-502
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
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