Mitsubishi Montero (2002-2004). Manual — part 752
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SYMPTOM PROCEDURES
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INSPECTION PROCEDURE 19: Surge.
.
COMMENT
• Defective ignition system, abnormal air/fuel ratio,
the electronic control throttle valve system failed,
etc. are suspected.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of air/fuel ratio control system.
• Malfunction of the electronic control throttle valve
system.
• Malfunction of the EGR system.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 "ON" position.
Q: Is DTC set?
YES : Refer to GROUP 13A, Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Using scan tool MB991502, check actuator test
items 01, 02, 03, 04, 05, 06: Injector.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to GROUP
13A, Actuator Test Reference Table
.
a. Item 01, 02, 03, 04, 05, 06: Injector.
(3) Turn the ignition switch to the "ON" position.
Q: Is the actuator operating properly?
YES : Go to Step 3.
NO : Refer to GROUP 13A, DTC P0201, P0202, P0203,
P0204, P0205, P0206
.
STEP 3. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service
− Ignition Timing
Check
Q: Is the ignition timing normal?
YES : Go to Step 4.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
ACX01539
16-PIN
MB991502
AC
ACX01539
16-PIN
MB991502
AC
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SYMPTOM PROCEDURES
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STEP 4. Using scan tool MB991502, check data list and
actuator test.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 GROUP
13A, 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).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 5.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 5. Using scan tool MB991502, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of data list. Refer to GROUP 13A,
Data List Reference Table
a. Item 39: Right Bank Heated Oxygen Sensor (front).
b. Item 11: Left Bank Heated Oxygen Sensor (front).
• Voltage should fluctuate between 0 − 0.4 volts and 0.6 −
1.0 volts 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 7.
NO : Go to Step 6.
ACX01539
16-PIN
MB991502
AC
ACX01539
16-PIN
MB991502
AC
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SYMPTOM PROCEDURES
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STEP 6. Check the fuel pressure.
Refer to GROUP 13A, On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Vacuum leak.
• Broken intake manifold gasket.
• Broken air intake hose.
• Broken vacuum hose.
• Positive crankcase ventilation valve does
not operate.
b. Injector clogged.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 7. Check the fuel pressure.
Refer to GROUP 13A, On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil, spark plugs, spark plug
cables.
b. Check the EGR system.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
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SYMPTOM PROCEDURES
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INSPECTION PROCEDURE 20: Knocking
.
COMMENT
• Incase such as the above, the cause is probably
that the detonation control is defective or the heat
value of the spark plug is inappropriate.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Defective knock sensor.
• Incorrect heat value of the spark plug.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using the scan tool MB991502, read the
diagnostic trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 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 GROUP 13A, Diagnostic Trouble Code Chart
NO : Go to Step 2.
STEP 2. Check the ignition timing.
(1) The ignition timing should retard more when knock sensor
connector B-09 is disconnected than when it is connected.
Q: When the knock sensor connector B-09 was
disconnected, was the ignition timing delayed?
YES : Check the following items, and repair or replace the
defective items.
a. Check the spark plugs.
b. Fuel quality, octane level.
c. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is
eliminated.
NO : Refer to GROUP 13A, DTC P0325
− Knock Sensor
Circuit
ACX01539
16-PIN
MB991502
AC
AK200961
1
2
CONNECTOR: B-09
B-09(GR)
KNOCK
SENSOR
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
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