Mitsubishi Montero Sport (2004+). Manual — part 331
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-737
INSPECTION PROCEDURE 6: Fires Up and Dies.
.
COMMENT
• In such cases as the above, the cause is usually
improper air/fuel mixture. It is possible, though
less likely, that the spark plugs are generating
sparks but the sparks are weak.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of the injector system.
• Contaminated fuel.
• Poor compression.
• Malfunction of the PCM.
• Malfunction of the immobilizer system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should remain greater than 8 volts while the
engine is cranked.
Q: Dose the voltage remain greater than 8 volts while the
engine is cranked?
YES : Go to Step 2.
NO : Refer to GROUP 54, Battery
− Battery Check
.
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 3.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-738
STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to
Actuator Test Reference Table
a. Item 07: Fuel Pump.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 4.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List
Reference Table
a. Item 21: Engine Coolant Temperature Sensor.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 5.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK303629AB
MB991911
MB991827
MB991824
16-PIN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-739
STEP 5. Check the engine start-ability.
Depress the accelerator pedal slightly, and start the engine.
Q: Is the start ability good?
YES : Go to Step 6.
NO : Go to Step 7.
STEP 6. Check the idle air control (IAC) motor operation
sound.
(1) Check that the engine coolant temperature is 20
°C (68°F)
or below.
NOTE: If necessary, you can disconnect the engine coolant
temperature sensor connector and connect the harness
side of the connector to another engine coolant temperature
sensor that is at 20
°
C (68
°
F) or below.
(2) Check that the operation sound of the IAC motor can be
heard after the ignition is switched to the "ON" position (but
without starting the engine).
• An operation sound is heard.
Q: Did you hear the operation sound?
YES : Carry out the following cleaning or adjustment.
a. Refer to On - vehicle Service - Clean the
throttle valve area
NO : Refer to DTC P0506
− Idle Control System RPM
Lower Than Expected
, DTC P0507
− Idle
Control System RPM Higher Than
Expected
STEP 7. Check the ignition timing.
(1) Check the ignition timing at cranking.
Standard value: 5
° BTDC ± 3°
Q: Is the ignition timing normal?
YES : Go to Step 8.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
AK302271
1
2
3
4
5
6
HARNESS CONNECTOR:
COMPONENT SIDE
AB
CONNECTOR: A-40
A-40(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-740
STEP 8. Measure the right bank injector resistance at
injector intermediate connector A-04.
(1) Disconnect the injector intermediate connector A-04.
(2) Measure the resistance between each male connector side
terminal.
a. Measure the resistance between terminal No. 8 and No.
3 when measuring No. 1 cylinder injector
b. Measure the resistance between terminal No. 8 and No.
2 when measuring No. 2 cylinder injector
c. Measure the resistance between terminal No. 8 and No.
1 when measuring No. 3 cylinder injector
d. Measure the resistance between terminal No. 8 and No.
7 when measuring No. 4 cylinder injector
e. Measure the resistance between terminal No. 8 and No.
6 when measuring No. 5 cylinder injector
f. Measure the resistance between terminal No. 8 and No.
5 when measuring No. 6 cylinder injector
• Resistance should be between 13 and 16 ohms [at 20°C
(68
°F)].
Q: Is the resistance normal?
YES : Go to Step 11.
NO : Go to Step 9.
AK200014
7
2 1
6 5
4 3
8
CONNECTOR: A-04
AB
FEMALE SIDE
CONNECTOR
A-04(B)
AK000542
6
3 4
7 8
1 2
5
INJECTOR
INTERMEDIATE
CONNECTOR
AB
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