Mitsubishi Montero (2004+). Manual — part 234
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-423
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine is running.
Judgment Criteria
• Injector coil surge voltage (battery positive volt-
age + 2 volts) has not been detected for 2 sec-
onds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Injector failed.
• Open or shorted injector circuit, or loose connec-
tor.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MB991474: Test Harness
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
INJ. SURGE V < V
B
+ 2.0 V
AK302941
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-424
STEP 1. Using scan tool MB991958, check actuator test
item 01, 02, 03, 04, 05, 06: Injectors.
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for
item 01, 02, 03, 04, 05, 06, Injectors.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C (176°F to 203°F).
• The idle should become slightly rougher.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
STEP 2. Check harness connector B-44 at injector
intermediate connector for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 17.
AK302970
AB
MB991911
MB991824
MB991827
AK200949
3
4
7
8
1
2
5
6
B-44(B)
CONNECTOR: B-44
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-425
STEP 3. Check the injector resistance at injector
intermediate connector B-44.
(1) Disconnect the injector intermediate connector B-44 and
measure at the injector side.
(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.
2 at No. 2 cylinder injector.
c. Measure the resistance between terminal No. 8 and No.
1 at No. 3 cylinder injector.
d. Measure the resistance between terminal No. 8 and No.
7 at No. 4 cylinder injector.
e. Measure the resistance between terminal No. 8 and No.
6 at No. 5 cylinder injector.
f. Measure the resistance between terminal No. 8 and No.
5 at No. 6 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 6.
NO : Go to Step 4.
STEP 4. Check the injector connector for damage.
a. Check the harness connector B-01 at No. 1 cylinder injec-
tor.
b. Check the harness connector B-33 at No. 2 cylinder injec-
tor.
c. Check the harness connector B-02 at No. 3 cylinder injec-
tor.
d. Check the harness connector B-35 at No. 4 cylinder injec-
tor.
e. Check the harness connector B-03 at No. 5 cylinder injec-
tor.
f. Check the harness connector B-11 at No. 6 cylinder injector.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 17.
AK200949
3
4
7
8
1
2
5
6
B-44(B)
CONNECTOR: B-44
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01494
INJECTOR INTERMEDIATE
MALE SIDE CONNECTOR
1 2 3 4
5 6 7 8
AB
AK200960
1
2
B-03(GR)
B-11(GR)
B-35(GR)
B-33(GR)
B-02(GR)
B-01(GR)
CONNECTORS: B-01, B-02, B-03, B-11,
B-33, B-35
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-426
STEP 5. Check for open circuit and harness damage
between injector intermediate connector and injector
connector.
a. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-01
(terminal No. 1) and injector connector B-01 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 3) at
No. 1 cylinder injector.
b. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-33
(terminal No. 1) and injector connector B-33 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 2) at
No. 2 cylinder injector.
c. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-02
(terminal No. 1) and injector connector B-02 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 1) at
No. 3 cylinder injector.
d. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-35
(terminal No. 1) and injector connector B-35 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 7) at
No. 4 cylinder injector.
e. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-03
(terminal No. 1) and injector connector B-03 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 6) at
No. 5 cylinder injector.
f. Check the harness wire between injector intermediate con-
nector B-44 (terminal No. 8) and injector connector B-11
(terminal No. 1) and injector connector B-11 (terminal No. 2)
and injector intermediate connector B-44 (terminal No. 5) at
No. 6 cylinder injector.
Q: Is the harness wire in good condition?
YES : Replace the injector. Then go to Step 17.
NO : Repair it. Then go to Step 17.
AK200949
3
4
7
8
1
2
5
6
B-44(B)
CONNECTOR: B-44
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200960
1
2
B-03(GR)
B-11(GR)
B-35(GR)
B-33(GR)
B-02(GR)
B-01(GR)
CONNECTORS: B-01, B-02, B-03, B-11,
B-33, B-35
AB
HARNESS CONNECTOR:
COMPONENT SIDE
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