Mitsubishi Galant (2004+). Manual — part 1208
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-525
.
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-526
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:)
• 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
INJ. SURGE V < V
B
+ 2.0 V
AK204052
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-527
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
NO : Go to Step 2.
STEP 2. Check the 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
Connector Inspection
. 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-528
STEP 3. Check the No. 6 cylinder injector.
(1) Disconnect the No.6 cylinder injector connector B-26.
(2) Measure the resistance between injector side connector
terminal No. 1 and No. 2.
Standard value: 10.5
− 13.5 ohms [at 20°C (68°F)]
Q: Is the resistance between 10.5 and 13.5 ohms [at 20
°C
(68
°F)]?
YES : Go to Step 4.
NO : Replace the No. 6 cylinder injector. Then go to Step
10.
STEP 4. Measure the power supply voltage at No. 6
cylinder injector connector B-26.
(1) Disconnect connector B-26 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Go to Step 5.
AK303116
M
1
2
CONNECTOR: B-26
B-26 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
AK303116
M
1
2
CONNECTOR: B-26
B-26 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK303117
1
2
B-26 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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