Mitsubishi Montero (2004+). Manual — part 225
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-387
STEP 9. Check harness connector B-33, B-35, B-11 at left
bank injector for damage.
Q: Is the harness connector in good condition?
YES : Then go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 16.
STEP 10. Check the left bank injector.
(1) Remove the intake manifold.
(2) Disconnect the left bank injector connector.
(3) Measure the resistance between 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 : Repair harness wire between injector intermediate
connector and left bank injector connector because of
harness damage. Then go to Step 16.
NO : Replace the injector. Then go to Step 16.
AK201292
1
2
B-11(GR)
B-35(GR)
B-33(GR)
CONNECTORS: B-11, B-33, B-35
AB
HARNESS
CONNECTORS:
COMPONENT SIDE
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-388
STEP 11. Check harness connector D-132 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 16.
STEP 12. Check for harness damage between left bank
injector connector and PCM connector.
a. Check the harness wire between injector connector B-33
(terminal No. 2) and PCM connector D-132 (terminal No. 9)
at No. 2 cylinder injector.
b. Check the harness wire between injector connector B-35
(terminal No. 2) and PCM connector D-132 (terminal No. 2)
at No. 4 cylinder injector.
c. Check the harness wire between injector connector B-11
(terminal No. 2) and PCM connector D-132 (terminal No.
25) at No. 6 cylinder injector.
Q: Is the harness wire in good condition?
YES : Go to Step 13.
NO : Repair it. Then go to Step 16.
STEP 13. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 16.
NO : Go to Step 14.
AK200938
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
AK201292
1
2
B-11(GR)
B-35(GR)
B-33(GR)
CONNECTORS: B-11, B-33, B-35
AB
HARNESS
CONNECTORS:
COMPONENT SIDE
AK200938
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-389
STEP 14. Check for entry of foreign matter (water,
kerosene, etc.) into fuel.
Q: Are there any abnormalities?
YES : Replace the fuel. Then go to Step 16.
NO : Go to Step 15.
STEP 15. Replace the left bank injector.
(1) Replace the left bank injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 2 −
Fuel Trim Monitor
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0174 set?
YES : Replace the PCM. Then go to Step 16.
NO : The inspection is complete.
STEP 16. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 2 −
Fuel Trim Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0174 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0175: System too Rich (bank 2)
.
Fuel Trim Circuit
• Refer to DTC P0201 − P0206, Injector Circuit.
.
CIRCUIT OPERATION
• Refer to DTC P0201 − P0206, Injector Circuit.
.
TECHNICAL DESCRIPTION
• If a malfunction occurs in the fuel system, the fuel
trim value becomes too small.
• The PCM checks whether the fuel trim value is
within a specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank air/fuel learning value (long time fuel trim)
and air/fuel feedback integral value (short time
fuel trim) are too rich.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Misfire monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
AK201292
1
2
B-11(GR)
B-35(GR)
B-33(GR)
CONNECTORS: B-11, B-33, B-35
AB
HARNESS
CONNECTORS:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-390
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Volume airflow sensor output frequency is higher
than 100 Hz.
Judgment Criteria
• Long-term fuel trim has continued to be lower
than
−12.5 percent for 5 seconds.
or
• Short-term fuel trim has continued to be lower
than
−7.4 percent for 5 seconds.
Check Conditions
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is higher than 77°C
(171
°F).
• Volume airflow sensor output frequency is lower
than 100 Hz.
Judgment Criteria
• Long-term fuel trim has continued to be lower
than
−12.5 percent for 5 seconds.
or
• Short-term fuel trim has continued to be lower
than
−12.5 percent for 5 seconds.
K
LRN
: LONG-TERM TRIM
K
I
: SHORT-TERM TRIM
K0 : MAXIMUM LIMIT OF LONG-TERM TRIM
K1 : MAXIMUM LIMIT OF SHORT-TERM TRIM
K2 : MINIMUM LIMIT OF LONG-TERM TRIM
K3 : MINIMUM LIMIT OF SHORT-TERM TRIM
START
MONITORING
CONDITIONS
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
K
LRN
> K0
MALFUNCTION
GOOD
K
LRN
< K2
K
I
< K3
K
I
> K1
CONTINUOUS FAILURE
FOR 5secs
AK302938
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