Mitsubishi Galant 9G. Manual — part 782
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-570
STEP 1. Using the oscilloscope, check the camshaft
position sensor.
(1) Disconnect the camshaft position sensor connector B-106,
and connect test harness special tool (MB991709) between
the separated connectors. (All terminals should be
connected.)
(2) Connect the oscilloscope probe to the camshaft position
sensor side connector terminal No. 2.
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. 104.
(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 2.
NO : Go to Step 4.
STEP 2. Check harness connector B-106 at camshaft
position sensor 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 20.
AK303863
1
2
3
AB
CONNECTOR: B-106
B-106 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK102976AB
1 2 3
CAMSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
MB991709
AK301961 AB
2 ENGINE REVOLUTIONS
NORMAL WAVEFORM
5V
AK303863
1
2
3
AB
CONNECTOR: B-106
B-106 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-571
STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?
YES : Replace the PCM. Then go to Step 20.
NO : 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
.
STEP 4. Check harness connector B-106 at camshaft
position sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 20.
STEP 5. Measure the sensor supply voltage at camshaft
position sensor connector B-106.
(1) Disconnect the connector B-106 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 and ground.
• Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 10.
NO : Go to Step 6.
AK303863
1
2
3
AB
CONNECTOR: B-106
B-106 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK303863
1
2
3
AB
CONNECTOR: B-106
B-106 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01421AF
B-106 HARNESS
CONNECTOR:
COMPONENT SIDE
3 2 1
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-572
STEP 6. Measure the sensor supply voltage at PCM
connector B-22 by using power plant ECU check harness
special tool MB991923.
(1) Disconnect the all PCM connectors and connect power
plant ECU check harness special tool MB991923 between
the separated connectors.
(2) Disconnect the camshaft position sensor connector B-106.
(3) Turn the ignition switch to the "ON" position.
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
AK202956
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-573
(4) Measure the voltage between terminal No. 104 and ground
by backprobing.
• Voltage should be between 4.9 and 5.1 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 7.
NO : Go to Step 8.
STEP 7. Check harness connector B-22 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between camshaft position
sensor connector B-106 (terminal No. 2) and PCM
connector B-22 (terminal No. 104) because of open
circuit. Then go to Step 20.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 20.
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AK202946AB
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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