Mitsubishi Colt Ralliart. Manual — part 78
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-266
Inspection Procedure 15: Knocking
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed detonation
control, improper thermal value of spark plug or
other faults.
PROBABLE CAUSES
• Defective detonation sensor
• Failed detonation control system
• Failed ignition system
• Defective spark plug
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Remove all injector connector.
• At the engine start, check each spark plug pro-
duces a spark
Q: Is the check result normal?
YES :
Check detonation sensor system (Refer to
Inspection Code No. P0325
NO :
Go to Step 3 .
STEP 3. Check spark plug.
• Check spark plug (Refer to GROUP 16 − Ignition
System
− On-vehicle Service − Spark Plug Check
and Cleaning
Q: Is the check result normal?
YES :
Check ignition circuit system (Refer to
Inspection Procedure 28
NO :
Replace spark plug.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-267
Inspection Procedure 16: Ignition timing offset
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed crank angle
sensor, failed camshaft position sensor, improper
installed timing belt or other faults.
PROBABLE CAUSES
• Failed crank angle sensor
• Failed camshaft position sensor
• Improperly installed timing belt
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Perform output wave pattern
measurement of crank angle sensor and
camshaft position sensor (Using an
oscilloscope).
Crank Angle Sensor
• Use special tool test harness (MB991658) to con-
nect A-133 crank angle sensor intermediate con-
nector, and measure at pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal No. 2 and earth.
Camshaft Position Sensor
• Use special tool test harness (MB991709) to con-
nect A-110 camshaft position sensor connector,
and measure at pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal No. 2 and earth.
OK: Output waveform timings of both sen-
sors are the same as the check procedure
(Refer to
) using an oscilloscope.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Go to Step 4 .
AK402016
1
2
3
AC
Connector: A-133
A-133 (B)
A-133 Harness side
connector
1
2
3
AK402009
Connector: A-110
AC
A-110 (B)
A-110 Harness side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-268
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
STEP 4. Check crank angle sensor and camshaft
position sensor mounted conditions.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
STEP 5. Check timing marks of timing chain.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Align timing marks.
STEP 6. Check crank shaft sensing blead.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Replace crank shaft sensing blead.
STEP 7. Check camshaft position sensing
cylinder.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Replace camshaft position sensing cylinder.
STEP 8. Replace crank angle sensor.
• After replacing the crank angle sensor, re-check
the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Go to Step 9 .
NO :
Check end.
STEP 9. Replace camshaft position sensor.
• After replacing the camshaft position sensor,
re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Inspection Procedure 17: Run on (dieseling)
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by leakage from injec-
tor.
PROBABLE CAUSES
• Failed injector
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. Check injector for spray condition.
• Check each injector for spray condition (Refer to
).
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Replace injector.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-269
Inspection Procedure 18: Odor, white smoke, black smoke, and high-concentration CO/HC during
idling
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by improper air-fuel
ratio, deteriorated catalyst, failed ignition system,
failed fuel system, failed compression pressure or
other faults.
PROBABLE CAUSES
• Failed air-fuel ratio control system
• Failed ignition system
• Failed fuel system
• Failed intake and exhaust system
• Failed exhaust gas cleaning system
• Failed compression pressure
• Failed catalytic converter
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Check injector for operating sound.
• Check injector for operating sound (Refer to
).
Q: Can operating sound be heard?
YES :
Go to Step 3 .
NO :
Check the injector system of the defective
cylinder.
(Refer to, Code No. P0201: No. 1 injector
(Refer to, Code No. P0202: No. 2 injector
(Refer to, Code No. P0203: No. 3 injector
(Refer to, Code No. P0204: No. 4 injector
).
STEP 3. Check ignition timing.
• Check ignition timing (Refer to GROUP 11A −
On-vehicle Service
− Ignition Timing Check
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check for offset ignition timing (Refer to
Inspection Procedure 16
STEP 4. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 13: Intake air temperature sensor
b. Item 21: Engine coolant temperature sensor
c. Item 25: Barometric pressure sensor
d. Item 32: Manifold absolute pressure sensor
Q: Are the check results normal?
YES :
Go to Step 5 .
NO :
Perform the diagnosis code classified check
Procedure for the sensor that has shown an
abnormal data value (Refer to Inspection
Chart for Diagnosis Code
STEP 5. Check air intake from intake hose and
inlet manifold.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair.
STEP 6. Check for emission leakage from
exhaust manifold.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
STEP 7. Check throttle body (throttle valve
portion) for contamination.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Clean throttle body (throttle valve portion)
(Refer to
).
Main
Index
Group
TOC
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