Mitsubishi Galant (2004+). Manual — part 1195
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-473
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. 1 cylinder injector failed.
• Open or shorted No.1cylinder injector circuit, har-
ness 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-474
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 01: No. 1 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 01, No. 1 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- 32 at intermediate
connector for damage.
Q: Is the 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 12.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-475
STEP 3. Check the No.1 cylinder injector resistance at
intermediate connector B-32.
(1) Disconnect the intermediate connector B-32.
(2) Measure the resistance between terminal No. 5 and No. 9.
• Resistance should be between 10.5 and 13.5 ohms.
Q: Is the measured resistance between 10.5 and 13.5
ohms?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check the connector B-01 at No. 1 cylinder
injector for damage.
Remove the intake manifold.
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 12.
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
1
2 3
6
7 8
4 5
9 10
AK303098
B-32
INTERMEDIATE
CONNECTOR
AB
AK303099
M
1
2
CONNECTOR: B-01
AB
B-01 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-476
STEP 5. Check the No. 1 cylinder injector B-01.
(1) Disconnect the No. 1 cylinder injector connector B-01.
(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 : Repair harness wire between intermediate connector
B-32 (terminal No. 9) and injector connector B-01
(terminal No. 1) and harness wire between No.1
cylinder injector connector B-01 (terminal No. 2)
and intermediate connector B-32 (terminal No. 5)
because of open circuit or short circuit to ground
or harness damage.
Then go to Step 12.
NO : Replace the No.1 cylinder injector. Then go to Step
12.
STEP 6. Measure the power supply voltage at intermediate
connector B-32.
(1) Disconnect the connector B-32 and measure at the female
connector side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 9 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 8.
NO : Go to Step 7.
AK303099
M
1
2
CONNECTOR: B-01
AB
B-01 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
3
4
5
8
9
1
2
6
7
10
AK203172
B-32 HARNESS
CONNECTOR:
COMPONENT
SIDE
AB
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