Mitsubishi Galant 9G. Manual — part 1060
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-540
.
CIRCUIT OPERATION
• The injector power is supplied from the MFI relay
(terminal No. 4).
• The PCM controls the injector by turning the
power transistor in the PCM "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is con-
trolled by the amount of continuity time the coil is
grounded by the PCM.
• A surge voltage is generated when the injectors
are driven and the current flowing to the injector
coil is shut off.
• The PCM checks this surge voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after injector is operated.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AK303115
CONNECTOR: B-26
B-26 (GR)
AB
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-541
DTC SET CONDITIONS <Circuit continuity
− open circuit and shorted low>
Logic Flow Chart
.
Check Conditions
• Engine is running.
Judgment Criteria
• The supply voltage is 3 volts or less without the
injector driving.
.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
INJ. SURGE V
<= 3 V
AK401614
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-542
DTC SET CONDITIONS <Circuit continuity
− shorted high>
Logic Flow Chart
.
Check Conditions
• Engine is running.
Judgment Criteria
• The coil current is 4 ampere or more with the
injector driving.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
− Other Monitor
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• No. 6 cylinder injector failed.
• Open or shorted No. 6 cylinder injector circuit,
harness damage, or connector damage.
• PCM failed.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
CURRENT
>= 4 A
AK401592
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-543
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness
• MB991923: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check actuator test
item 02, 04, 06: No. 6 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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for
item 06, No. 6 Injector.
(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
− How to
Cope with Intermittent Malfunctions
NO : Go to Step 2.
STEP 2. Check the harness connector B-26 at No. 6
cylinder injector 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
. Then go to Step 10.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303116
M
1
2
CONNECTOR: B-26
B-26 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
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