Mitsubishi Outlander GS45X. Manual — part 988
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-885
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.
5. Connect scan tool MB991958 to the data link connector.
6. Turn the ignition switch to the ON position (But do not start
the engine).
7. Use Actuator test "item number 9" to drive the fuel pump.
Check that there is no fuel leaking from any section when
the fuel pump is operating.
8. Finish the actuator test or turn the ignition switch to the
LOCK (OFF) position.
9. Start the engine and run at idle.
10.Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 324 kPa (47 psi) at
curb idle
11.Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
12.If any of fuel pressure measured in Step 10 to 11 is out of
specification, troubleshoot and repair according to the table
below.
13.Stop the engine and observe fuel pressure gauge reading. It
is normal if the reading does not drop within 2 minutes. If it
does, observe the rate of drop and troubleshoot and repair
according to the table below. Start, then stop the engine.
(1) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(2) If pressure continues to drop with both fuel lines
squeezed closed, injector(s) are leaking.
14.Release residual pressure from the fuel pipe line. (Refer to
Fuel Pump Connector Disconnection (How To Reduce
Pressurized Fuel Lines)
.)
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after
revving
Clogged fuel filter
Replace fuel filter
Fuel leaking to return side due to
poor fuel regulator valve seating
or settled spring
Replace fuel pressure regulator
Low fuel pump delivery pressure Replace fuel pump
Fuel pressure too high
Binding valve in fuel pressure
regulator
Replace fuel pressure regulator
SYMPTOM
PROBABLE CAUSE
REMEDY
Fuel pressure drops gradually
after engine is stopped
Leaky injector
Replace injector
Leaky fuel regulator valve seat Replace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is
stopped
Check valve in fuel pump is
held open
Replace fuel pump
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-886
WARNING
To prevent a fire, cover the hose connection with
shop towels to prevent splash of fuel that could be
caused by some residual pressure in the fuel pipe
line.
15.Remove the fuel pressure gauge and special tool from the
fuel rail.
16.Fit the fuel high-pressure hose to the fuel rail.
17.Check for fuel leaks.
(1) Use scan tool MB991958 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
18.Disconnect scan tool MB991958.
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000901948
The service procedure is the same as the vehicles with 2.4L
engine (Refer to GROUP 13A, On-vehicle Service
).
FUEL TANK PUMP OPERATION CHECK
M1131002002289
The service procedure is the same as the vehicles with 2.4L
engine (Refer to GROUP 13A, On-vehicle Service
).
MULTIPORT FUEL INJECTION (MFI) RELAY
CONTINUITY CHECK
M1131050001229
Inspect the MFI relay for continuity in accordance with the chart
shown below.
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED
TO BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
1
− 3
Supplied
1
− 3
2
− 4
1
3
2
4
1
3
2
4
AK703916
MFI relay
side connector
MFI relay
side connector
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-887
FUEL PUMP RELAY CONTINUITY CHECK
M1131033001226
Inspect the fuel pump relay for continuity in accordance with
the chart shown below.
BATTERY
VOLTAGE
TERMINAL
NO. TO BE
CONNECTED
TO BATTERY
TERMINAL NO. TO
BE CONDUCTED
Supplied
6 (Connector
"A")
− 11
(Connector
"B")
1 (Connector "C")
−
1 (Connector "D")
AK700095AB
ETACS-ECU
Connector “A”
Connector “B”
Connector “D”
Connector “C”
1 2 3 4
5 6 7
8 9 10 11
131415
12
1 2
1 2
1
6
4
5
9
8
10 11
13
15
14
12
16
7
2 3
AK703917AB
Etacs-ECU side connector
Connector "D"
Connector "C"
Connector "B"
Connector "A"
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-888
INJECTOR RELAY AND THROTTLE ACTUATOR
CONTROL MOTOR RELAY CONTINUITY CHECK
M1131054700023
Inspect the Injector relay and throttle actuator control motor
relay for continuity in accordance with the chart shown below.
INTAKE AIR TEMPERATURE SENSOR CHECK
M1131002801419
1. Disconnect the mass airflow sensor connectors.
2. Measure resistance between terminals 1 and 4.
Standard value:
13
− 17 kΩ [at -20°C (-4°F)]
5.3
− 6.7 kΩ [at 0°C (32°F)]
2.3
− 3.0 kΩ [at 20°C (68°F)]
1.0
− 1.5 kΩ [at 40°C (104°F)]
0.56
− 0.76 kΩ [at 60°C (140°F)]
0.30
− 0.45 kΩ [at 80°C (176°F)]
3. If not within specifications, replace the mass airflow sensor.
4. Measure resistance while heating the sensor using a hair
dryer.
Normal condition:
5. If resistance does not decrease as heat increases, replace
the mass airflow sensor.
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED
TO BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
1
− 2
Supplied
1
− 2
3
− 4
AK703918
1
2
3
4
1
2
3
4
AB
Injector relay or
throttle actuator
control motor relay
side connector
Injector relay or throttle actuator
control motor relay side connector
TEMPERATURE
RESISTANCE (k
Ω)
Higher
Smaller
1
2
3 4
AK700097AB
Intake air temperature
sensor connector
AK700098 AB
Intake air
temperature
sensor
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