Mitsubishi Eclipse. Manual — part 235
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-433
DTC SET CONDITIONS <Rationality-alignment>
Logic Flow Chart
.
Check Conditions
• Engine speed is higher than 50 r/min.
Judgment Criteria
• Camshaft position sensor output voltage has not
changed (no pulse signal is input) for 2 seconds.
.
START
END
YES
NO
NO
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 2secs
EXPECTED STATE
OF THE SENSOR
MONITORING
CONDITIONS?
YES
NO
AK301447
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-434
DTC SET CONDITIONS <Circuit countinuity>
Logic Flow Chart
.
Check Conditions
• Engine speed is higher than 50 r/min.
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-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Camshaft position sensor failed.
• Camshaft position sensing cylinder.
• Open or shorted camshaft position sensor circuit,
or harness damage or connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>
DIAGNOSIS
Required Special Tool:
• MB991709: Test Harness Set
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
OUTPUT SIGNAL
CHANGES
CONTINUOUS
FAILURE FOR 2secs
MONITORING
CONDITIONS?
YES
NO
AK301448
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-435
STEP 1. Using the oscilloscope, check the camshaft
position sensor.
(1) Disconnect the camshaft position sensor connector B-09,
and connect test harness special tool (MB991709) in
between. (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 ECM or PCM side con-
nector, connect an oscilloscope probe to terminal No. 88
<M/T> or terminal No. 56 <A/T>.
(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 connector B-09 at camshaft position
sensor for damage.
Q: Is the 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 19.
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 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?
YES : Replace the ECM or PCM. Then go to Step 19.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
AK102976AB
1 2 3
CAMSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
MB991709
AK103570 AB
2 ENGINE REVOLUTIONS
NORMAL WAVEFORM
5V
AK300411
1
2
3
B-09 (B)
AB
CONNECTOR: B-09
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-436
STEP 4. Check connector B-09 at camshaft position
sensor for damage.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 19.
STEP 5. Measure the sensor supply voltage at camshaft
position sensor connector B-09.
(1) Disconnect the connector B-09 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 4.8 and 5.2 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES : Go to Step 10.
NO : Go to Step 6.
AK300411
1
2
3
B-09 (B)
AB
CONNECTOR: B-09
HARNESS CONNECTOR:
COMPONENT SIDE
AK300411
1
2
3
B-09 (B)
AB
CONNECTOR: B-09
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01421AL
B-09 HARNESS
CONNECTOR:
COMPONENT SIDE
3 2 1
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