Mitsubishi Montero Sport (2004+). Manual — part 337
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-761
INSPECTION PROCEDURE 12: When the Engine Is Hot, It Stalls at Idle (Die Out).
.
COMMENT
• In cases such as the above, the ignition system,
air/fuel mixture, idle air control motor or compres-
sion pressure may be faulty. In addition, if the
engine suddenly stalls, the cause may also be a
loose connector.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of air/fuel ratio control system.
• Malfunction of the IAC system.
• Vacuum leak.
• Improper connector contact.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?
YES : Start the engine and let it run at idle for approximate
10 minutes after engine warm up. Then, if a
malfunction occurs, go to step 2.
NO : Go to Step 2.
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)
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STEP 3. 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 should be heard.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Did you hear the operation sound?
YES : Go to Step 4.
NO : Refer to DTC P0506
− Idle Control System RPM
Lower Than Expected
, DTC P0507
− Idle
Control System RPM Higher Than
Expected
STEP 4. Using scan tool MB991958, check actuator test
items 01, 02, 03, 04, 05, 06: Injector.
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) Check following items in the actuator test. Refer to Actuator
Test Reference Table
a. Items 01, 02, 03, 04, 05, 06: Injector.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 5.
NO : Refer to DTC P0201, P0202, P0203, P0204, P0205,
P0206
− Injector Circuit
.
AK302271
1
2
3
4
5
6
HARNESS CONNECTOR:
COMPONENT SIDE
AB
CONNECTOR: A-40
A-40(B)
AK303629AB
MB991911
MB991827
MB991824
16-PIN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-763
STEP 5. Checking by operating the accelerator pedal.
Q: Does the engine stall right after the accelerator pedal is
released?
YES : Carry out the following cleaning or adjustment.
a. Refer to On-vehicle Service - Clean the throttle
valve area
NO : Go to Step 6.
STEP 6. Engine stall reproduction test.
Q: Is it easy to reproduce the engine stall?
YES : Go to Step 7.
NO : Check if the following signals change suddenly by
wiggling the circuit harness and connectors.
a. Crankshaft position sensor signal.
b. Volume airflow sensor signal.
c. Injector drive signal.
d. Primary and secondary ignition signal.
e. Fuel pump drive signal.
f. PCM power supply voltage.
Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 7. Using scan tool MB991958, check data list.
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) Check the following items in the data list. Refer to Data List
Reference Table
a. Item 13: Intake Air Temperature Sensor.
b. Item 25: Barometric Pressure Sensor.
c. Item 21: Engine Coolant Temperature Sensor.
d. Item 69: Right Bank Heated Oxygen Sensor (rear)
e. Item 39: Right Bank Heated Oxygen Sensor (front)
f. Item 59: Left Bank Heated Oxygen Sensor (rear)
g. Item 11: Left Bank Heated Oxygen Sensor (front)
h. Item 27: Power Steering Pressure Switch.
i. Item 28: A/C Switch.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 8.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-764
STEP 8. 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 10: EGR Vacuum Regulator Solenoid Valve.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 9.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 9. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of the data list. Refer to Data List
Reference Table
a. Item 39: Right Bank Heated Oxygen Sensor (front)
b. Item 11: Left Bank Heated Oxygen Sensor (front)
• Fluctuates between 0 − 0.4 volt and 0.6 − 1.0 volt while
idling after the engine has been warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 12.
NO : Go to Step 10.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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