Mitsubishi 380. Manual — part 566
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-356
DIAGNOSIS
Required Special Tools:
• Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MD998478: Test Harness (3pin, triangle)
• MB992044: Power Plant ECU Check Harness
STEP 1. Using diagnostic tool , check data list item 02:
Crankshaft Position Sensor.
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 data reading mode for item 02,
Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the
diagnostic tool should match.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor 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.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-357
STEP 2. Using the oscilloscope, check the crankshaft
position sensor.
(1) Disconnect the crankshaft position sensor connector B-119,
and connect the test harness special tool (MD998478)
between the separated connectors.
(2) Connect the oscilloscope probe to crankshaft position
sensor connector terminal No. 2 (black clip of special tool).
NOTE: When measuring with the ECU side connector, dis-
connect the all ECU connectors and connect check harness
special tool (MB992044) between the separated connec-
tors. then connector the oscilloscope probe to the check
harness connector terminal No. 23.
(3) Start the engine and run at idle.
(4) Check the waveform.
• The waveform should show a pattern similar to the illus-
tration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 3.
NO : Go to Step 5.
AK303123
1
2
3
CRANKSHAFT
POSITION
SENSOR
AB
CRANKSHAFT
SPROCKET
CONNECTOR: B-119
B-119 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK102979AB
MD998478
1 2
3
CRANKSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
AK302211
5V
NORMAL WAVEFORM
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-358
STEP 3. Check harness connector B-119 at the crankshaft
position sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 18.
STEP 4. Using diagnostic tool , check data list item 02:
Crankshaft Position Sensor.
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) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool to the data reading mode for item 02,
Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the
diagnostic tool should match.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor 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 : Then go to Step 5.
AK303123
1
2
3
CRANKSHAFT
POSITION
SENSOR
AB
CRANKSHAFT
SPROCKET
CONNECTOR: B-119
B-119 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI)
13A-359
STEP 5. Check harness connector B-119 at the crankshaft
position sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 18.
AK303123
1
2
3
CRANKSHAFT
POSITION
SENSOR
AB
CRANKSHAFT
SPROCKET
CONNECTOR: B-119
B-119 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
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