Mitsubishi Montero (2004+). Manual — part 340
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-847
INSPECTION PROCEDURE 5: Cranks, Won't Start
.
Cranks, Won't Start Circuit
• Refer to Ignition circuit
.
CIRCUIT OPERATION
• Refer to Ignition circuit
.
COMMENT
• In cases such as the above, the cause is proba-
bly no spark, fuel delivery, or fuel quality prob-
lems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition system.
• Malfunction of the fuel pump system.
• Malfunction of the injector system.
• Malfunction of the PCM.
• Contaminated fuel.
• 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
• MB991348: Test Harness
STEP 1. Check the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should be 8 volts or more.
Q: Is the voltage normal?
YES : Go to Step 2.
NO : Check the battery. Refer to GROUP 54A, Battery
−
Battery Check
. Then confirm that the
malfunction symptom is eliminated.
STEP 2. Check the timing belt for breaks.
Q: Is the timing belt good condition?
YES : Go to Step 3.
NO : Replace timing belt. Then confirm that the malfunction
symptom is eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-848
STEP 3. 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 the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 4.
STEP 4. 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 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.
c. Item 21: Engine Coolant Temperature Sensor.
(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.
AK302970
AB
MB991911
MB991824
MB991827
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-849
STEP 5. 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 6.
NO : Repair or replace. Then confirm that the malfunction
symptom is eliminated.
STEP 6. Check the ignition system.
(1) Connect the timing light to terminal No. 1 of the ignition coil
connector B-31, B-32 or B-34 in order.
(2) Crank the engine.
• The timing light flashes.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the timing light flash?
YES : Go to Step 7.
NO : Refer to INSPECTION PROCEDURE 30
− Ignition
Circuit System
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.
AK302970
AB
MB991911
MB991824
MB991827
AK201291
1
2
3
B-31(GR)
B-32(GR)
B-34(GR)
AB
CONNECTORS: B-31, B-32, B-34
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-850
STEP 8. Check the left bank injector.
(1) Disconnect the left bank injector connector B-11, B-33,
B-35.
(2) Measure the resistance between each injector side
connector terminal No. 1 and No. 2.
Standard value: 13
− 16 ohms [at 20°C (68°F)]
Q: Is the resistance between 13 and 16 ohms [at 20
°C
(68
°F)]?
YES : Go to Step 9.
NO : Replace the faulty injector. Then confirm that the
malfunction symptom is eliminated.
STEP 9. Check the right bank injector resistance at injector
intermediate connector B-44.
(1) Disconnect the injector intermediate connector B-44.
(2) Measure the resistance between each male connector side
terminal.
a. Measure the resistance between terminal No. 8 and No.
3 at No. 1 cylinder injector.
b. Measure the resistance between terminal No. 8 and No.
1 at No. 3 cylinder injector.
c. Measure the resistance between terminal No. 8 and No.
6 at No. 5 cylinder injector.
• Resistance should be between 13 and 16 ohms [at 20°C
(68
°F)].
Q: Is the measured resistance between 13 and 16 ohms [at
20
°C (68°F)]?
YES : Go to Step 12.
NO : Go to Step 10.
AK201292
1
2
B-11(GR)
B-35(GR)
B-33(GR)
CONNECTORS: B-11, B-33, B-35
AB
HARNESS
CONNECTORS:
COMPONENT SIDE
AKX01414AB
INJECTOR SIDE
CONNECTOR
1 2
AK200949
3
4
7
8
1
2
5
6
B-44(B)
CONNECTOR: B-44
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK201554
1
5 6 7 8
2 3 4
AB
INJECTOR INTERMEDIATE
MALE SIDE CONNECTOR
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