Mitsubishi Galant 9G. Manual — part 777
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-550
DTC SET CONDITIONS <Circuit continuity>
Logic Flow Chart
Check Conditions
• Engine is being cranked.
Judgment Criteria
• Crankshaft position sensor output voltage has not
changed (no pulse signal is input) for 2 seconds.
.
START
MONITORING
CONDITIONS
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
OUTPUT SIGNAL
CHANGES
CONTINUOUS
FAILURE FOR 2secs
AK302034
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-551
DTC SET CONDITIONS <Range/Performance problem
− alignment>
Logic Flow Chart
Check Conditions, Judgment Criteria
• Normal signal pattern has not been input for cyl-
inder identification from the crankshaft position
sensor signal and camshaft position sensor sig-
nal for 2 seconds.
.
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:)
• Crankshaft position sensor failed.
• Open or shorted crankshaft position sensor cir-
cuit, or harness damage, or connector damage.
• PCM failed.
START
END
YES
NO
NO
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR
2secs
EXPECTED STATE
OF THE SENSOR
MONITORING
CONDITIONS?
YES
NO
AK302035
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-552
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 data list item 22:
Crankshaft Position Sensor.
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 data reading mode for item
22, Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the scan
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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-553
STEP 2. Using the oscilloscope, check the crankshaft
position sensor.
(1) Disconnect the crankshaft position sensor intermediate
connector B-119 and connect the test harness special tool
(MB991658) between the separated connectors.
(2) Connect the oscilloscope probe to terminal No. 2 of the
crankshaft position sensor side connector.
NOTE: When measuring with the PCM side connector, dis-
connect the all PCM connectors and connect check har-
ness special tool (MB991923) between the separated
connectors. Then connect the oscilloscope probe to the
check harness connector terminal No. 103.
(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.
STEP 3. Check harness connector B-119 at the crankshaft
position sensor intermediate connector 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
. Then go to Step 22.
AK303860
1
2
3
AB
CONNECTOR: B-119
B-119 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK302199
1 2 3
AB
MB991658
OSCILLOSCOPE
CRANKSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR
AK301956
5V
NORMAL WAVEFORM
AB
AK303860
1
2
3
AB
CONNECTOR: B-119
B-119 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
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