Mitsubishi Colt Ralliart. Manual - part 735

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-265

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: Neutral

• 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: Neutral

• 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.13B-352

) using an oscilloscope.

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Go to Step 4 .

STEP 3. Check the trouble symptom.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU.

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 belt.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Align timing marks.

STEP 6. Check crank angle sensor sensing 
blade.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Replace crank angle sensor sensing blade.

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.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

AK402095

1

2

3

AC

A-133(DG)

Connector: A-133

Harness side 
connector

AK402097

1

2

3

AC

Connector: A-110

Harness side 
connector

A-110(B)

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-266

Inspection Procedure 15: Run On (Dieseling)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by leakage from injec-

tor.

PROBABLE CAUSES

• Failed injector

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check injector for spray condition.

• Check each injector for spray condition (Refer to 

P.13B-367

).

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Replace injector.

Inspection Procedure 16: 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, improper compression pres-
sure, or other faults.

PROBABLE CAUSES

• Failed air-fuel ratio control system

• Failed ignition system

• Failed fuel system

• Failed intake/exhaust system

• Failed exhaust gas cleaning systems

• Improper compression pressure

• Failed catalytic converter

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is the diagnosis code output?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13B-18

).

NO : 

Go to Step 2 .

STEP 2. Check injector for operating sound.

• Check injector for operating sound (Refer to 

P.13B-367

).

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.13B-92

).

(Refer to Code No. P0202: No. 2 Injector 

System 

P.13B-97

).

(Refer to Code No. P0203: No. 3 Injector 

System 

P.13B-102

).

(Refer to Code No. P0204: No. 4 Injector 

System 

P.13B-107

).

STEP 3. Check ignition timing.

• Check ignition timing (Refer to GROUP 11C − 

On-vehicle Service 

− Ignition Timing Check 

P.11C-12

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Check for offset ignition timing (Refer to 
Inspection Procedure 14 

P.13B-264

).

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-267

STEP 4. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 12: Air flow sensor
b. Item 13: Intake air temperature sensor

c. Item 21: Engine coolant temperature sensor

d. Item 25: Barometric 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.13B-18

).

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 exhaust manifold for emission 
leakage.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair.

STEP 7. Check throttle body (throttle valve) for 
contamination.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Clean throttle body (throttle valve) (Refer to 

P.13B-358

).

STEP 8. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 11: Oxygen sensor (front)
b. Item 59: Oxygen sensor (rear)

Q: Is the check result normal?

YES : 

Go to Step 9 .

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.13B-18

).

STEP 9. Check purge control solenoid valve.

• Check purge control solenoid valve (Refer to 

GROUP 17 

− Emission Control System − Evapo-

rative Emission Control System 

− Purge Control 

Solenoid Valve Check 

P.17-16

).

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Replace purge control solenoid valve.

STEP 10. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13B-358

).

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair.

STEP 11. Check positive crankcase ventilation 
valve.

• Check positive crankcase ventilation valve (Refer 

to GROUP 17 

− Emission Control System − 

Crankcase Emission Control System 

− Positive 

Crankcase Ventilation (PCV) Valve Check 

P.17-13

).

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Replace positive crankcase ventilation 
valve.

STEP 12. 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 : 

Go to Step 14 .

NO : 

Go to Step 13 .

STEP 13. Check spark plug.

• Check spark plug (Refer to GROUP 16 − Ignition 

System 

− On-vehicle Service 

P.16-35

).

Q: Is the check result normal?

YES : 

Check ignition circuit system (Refer to 

Inspection Procedure 26 

P.13B-327

).

NO : 

Replace spark plug.

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-268

STEP 14. Check compression pressure.

• Check compression pressure (Refer to GROUP 

11C 

− On-vehicle Service − Compression Pres-

sure Check 

P.11C-13

).

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair.

STEP 15. Check injector for spray condition.

• Check each injector for spray condition (Refer to 

P.13B-367

).

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Replace injector.

STEP 16. Replace catalytic converter

• After replacing the catalytic converter, re-check 

the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU.

NO : 

Check end.

Inspection Procedure 17: Battery Run Down

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed alternator, 

failed power generation control system, or other 
faults.

PROBABLE CAUSES

• Failed battery

• Alternator G terminal short-circuited

• Failed alternator

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Measure battery voltage during cranking

OK: 8 V or more

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check battery (Refer to GROUP 54A 

− 

Battery 

− On-vehicle Service − Battery Test 

P.54A-5

).

STEP 2. Connector check: A-131 alternator 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

2

1

3

4

AK402098

A-131(G)

Connector: A-131

Harness side 
connector

AC

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