Mitsubishi Galant 9G. Manual — part 756
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-466
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) <2.4L ENGINE>
13A-467
DTC SET CONDITIONS <Circuit continuity
− open circuit and shorted high>
Logic Flow Chart
Check Conditions
• Engine is running.
Judgement 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.1 cylinder injector failed.
• Open or shorted No.1 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) <2.4L ENGINE>
13A-468
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
− How to
Cope with Intermittent Malfunctions
NO : Go to Step 2.
STEP 2. Check harness connector B-01 at No. 1 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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
M
1
2
AK303843
B-01 (GR)
CONNECTOR: B-01
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-469
STEP 3. Check the No. 1 cylinder injector.
(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 measured resistance between 10.5 and 13.5 ohms
[at 20
°C (68°F)]?
YES : Go to Step 4.
NO : Replace the No. 1 cylinder injector. Then go to Step
STEP 4. Measure the power supply voltage at No. 1
cylinder injector connector.
(1) Disconnect connector B-01 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
AK303843
B-01 (GR)
CONNECTOR: B-01
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
M
1
2
AK303843
B-01 (GR)
CONNECTOR: B-01
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK000560
1
2
B-01 HARNESS
CONNECTOR:
COMPONENT SIDE
AN
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