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 

P.13A-20

).

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 

P.13A-130

).

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 

P.16-35

).

Q: Is the check result normal?

YES : 

Check ignition circuit system (Refer to 

Inspection Procedure 28 

P.13A-320

).

NO : 

Replace spark plug.

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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 

P.13A-20

).

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 

P.13A-348

) 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

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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 

P.00-13

).

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 

P.00-13

).

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 

P.13A-364

).

Q: Is the check result normal?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Replace injector.

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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 

P.13A-20

).

NO : 

Go to Step 2 .

STEP 2. Check injector for operating sound.

• Check injector for operating sound (Refer to 

P.13A-364

).

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 

system 

P.13A-89

). 

 (Refer to, Code No. P0202: No. 2 injector 

system 

P.13A-94

). 

 (Refer to, Code No. P0203: No. 3 injector 

system 

P.13A-99

). 

 (Refer to, Code No. P0204: No. 4 injector 

system 

P.13A-104

). 

STEP 3. Check ignition timing.

• Check ignition timing (Refer to GROUP 11A − 

On-vehicle Service 

− Ignition Timing Check 

P.11A-9

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Check for offset ignition timing (Refer to 
Inspection Procedure 16 

P.13A-267

).

STEP 4. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

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 

P.13A-20

).

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 

P.13A-355

).

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