Mitsubishi 380. Manual — part 551
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-296
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• No.4 cylinder injector failed.
• Open or shorted to ground No.4 cylinder injector
circuit.
• Shorted to battery, No.4 cylinder injector circuit.
• Harness or connector damage.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness Set
• MB992044: Power Plant ECU Check Harness
STEP 1. Using diagnostic tool , check actuator test item
04: No. 4 injector.
CAUTION
To prevent damage to diagnostic tool , always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Start the engine and run at idle.
(3) Set diagnostic tool to the actuator testing mode for item 04,
No. 4 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: Does the idle vary or engine run "rough"?
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-27 at No. 4
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.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303110
M
1
2
CONNECTOR: B-27
B-27 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-297
STEP 3. Check the No. 4 cylinder injector.
(1) Disconnect the No.4 cylinder injector connector B-27.
(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. 4 cylinder injector. Then go to Step
10.
STEP 4. Measure the power supply voltage at No. 4
cylinder injector connector B-27.
(1) Disconnect connector B-27 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.
AK303110
M
1
2
CONNECTOR: B-27
B-27 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
AK303110
M
1
2
CONNECTOR: B-27
B-27 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK303111
1
2
B-27 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-298
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. 4 cylinder injector
connector B-27 (terminal No. 1) because of open
circuit or short circuit to ground.
Then go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 10.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-299
STEP 6. Check for harness damage between MFI relay
connector B-17X (terminal No. 4) and No. 4 cylinder
injector connector B-27 (terminal No. 1).
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair it. Then go to Step 10.
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
AK303110
M
1
2
CONNECTOR: B-27
B-27 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
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