Mitsubishi Galant (2004+). Manual — part 916
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-481
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.3 cylinder injector failed.
• Open or shorted No.3 cylinder injector circuit,
harness damage or connector damage.
• PCM failed.
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
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
INJ. SURGE V
< V
B
+ 2.0 V
AK302031
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-482
STEP 1. Using scan tool MB991958, check actuator test
item 03: No.3 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 03 No. 3 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 harness connector B-03 at No. 3 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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
M
1
2
AK303849
B-03 (GR)
CONNECTOR: B-03
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-483
STEP 3. Check the No. 3 cylinder injector.
(1) Disconnect the No. 3 cylinder injector connector B-03.
(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 measured resistance between 10.5 and 13.5 ohms
[at 20
°C (68°F)]?
YES : Go to Step 4.
NO : Replace the No. 3 cylinder injector. Then go to Step
10.
STEP 4. Measure the power supply voltage at No. 3
cylinder injector connector.
(1) Disconnect connector B-03 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.
M
1
2
AK303849
B-03 (GR)
CONNECTOR: B-03
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
M
1
2
AK303849
B-03 (GR)
CONNECTOR: B-03
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK000560
1
2
B-03 HARNESS
CONNECTOR:
COMPONENT SIDE
AP
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-484
STEP 5. Check harness connector B-17X at MFI relay for
damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MFI relay connector
B-17X (terminal No. 4) and No. 3 cylinder injector
connector B-03 (terminal No. 1). Then go to Step
10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 10.
STEP 6. Check for harness damage between MFI relay
connector B-17X (terminal No. 4) and No. 3 cylinder
injector connector B-03 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair it. Then go to Step 10.
AK303806
2
1
3
4
AB
CONNECTOR: B-17X
B-17X
RELAY BOX
TRIANGLE
MARK
HARNESS CONNECTOR:
COMPONENT SIDE
AK303806
2
1
3
4
AB
CONNECTOR: B-17X
B-17X
RELAY BOX
TRIANGLE
MARK
HARNESS CONNECTOR:
COMPONENT SIDE
M
1
2
AK303849
B-03 (GR)
CONNECTOR: B-03
AB
HARNESS CONNECTOR:
COMPONENT SIDE
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