Mitsubishi Colt Ralliart. Manual - part 75

 

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Mitsubishi Colt Ralliart. Manual - part 75

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-254

STEP 8. Check injector for operating sound.

• Check injector for operating sound at engine 

cranking (Refer to 

P.13A-364

).

Q: Can operating sound be heard?

YES : 

Go to Step 9 .

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 9. Check timing marks of timing chain.

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Align timing marks.

STEP 10. 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 12 .

NO : 

Go to Step 11 .

STEP 11. 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.

STEP 12. Check spray condition of injector.

• Check each injector for spray condition (Refer to 

P.13A-364

).

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Replace injector.

STEP 13. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13A-355

).

Q: Is the check result normal?

YES : 

Go to Step 14 .

NO : 

Repair.

STEP 14. Check compression pressure.

• Check compression pressure (Refer to GROUP 

11A 

− On-vehicle Service − Compression Pres-

sure Check 

P.11A-12

).

Q: Is the check result normal?

YES : 

Go to Step 15 <CVT> , go to Step 16 <M/T> 

.

NO : 

Repair.

STEP 15. Check EGR valve (stepper motor) itself.

• Check EGR valve (stepper motor) itself [Refer to 

GROUP 17 

− Emission Control System − 

Exhaust Gas Recirculation (EGR) System 

− EGR 

Valve (stepper motor) Check 

P.17-20

].

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Replace EGR valve (stepper motor).

STEP 16. Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

• After replacing the engine-ECU <M/T> or 

engine-CVT-ECU <CVT>, re-check the trouble 
symptoms. 

Q: Does trouble symptom persist?

YES : 

Check for foreign matters (water, kerosene, 

etc.) in fuel and replace if necessary. 

NO : 

Check end.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-255

Inspection Procedure 8: Unstable idling (Rough idling, Hunting), improper idling speed (Too high or 
too low), engine stalls during idling (Die out)

COMMENT ON TROUBLE SYMPTOM

• Probable causes can be widely found in ignition 

system, air-fuel ratio control system, idle air con-
trol fuel system, etc. A sudden engine stall is pos-
sibly caused by poor connector contact.

PROBABLE CAUSES

• Failed ignition system

• Failed fuel system 

• Failed air-fuel ratio control system

• Failed intake/exhaust system

• Failed exhaust gas cleaning system

• Throttle valve fouled around

• Timing chain out of place 

• Compression pressure improper 

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. Check battery condition.

Q: Has the battery terminal been disconnected? 

YES : 

Carry out the learning procedure for the 

idling (Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

Learning Procedure for Idling in MPI Engine 

P.00-21

).

NO : 

Go to Step 2 .

STEP 2. 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 3 .

STEP 3. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 13: Intake air temperature sensor 
b. Item 14: Throttle position sensor (sub)

c. Item 21: Engine coolant temperature sensor 

d. Item 25: Barometric pressure sensor
e. Item 32: Manifold absolute pressure sensor

f. Item 77: Accelerator pedal position sensor 

(sub)

g. Item 78: Accelerator pedal position sensor 

(main)

h. Item 79: Throttle position sensor (main)

Q: Are the check results normal?

YES : 

Go to Step 4 .

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 4. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 29: Inhibitor switch
b. Item 67: Stop lamp switch

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 timing marks of timing chain.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Align timing marks.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-256

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

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-355

).

STEP 8. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

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

Q: Are the check results 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.13A-20

).

STEP 9. Perform voltage measurement at A-114 
engine-ECU connector or engine-CVT-ECU 
connector.

• Disconnect engine-ECU connector or 

engine-CVT-ECU connector, and connect Special 
Tool Power Plant ECU Check Harness 
(MB991987), and then measure the voltage on 
the check connector.

• Engine: Idling after warm-up

• Transmission: P range

• Radiator fan: Not operating

• Voltage between terminal No. 64 and earth.

OK: Switching the headlamps to ON from 
OFF causes the voltage to increase 0.2 

 3.5 

V.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Go to Step 10 .

AK402745

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L

AE

A-114

Connector: 

A-114

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

A-114 Special tool power plant ECU check 
harness

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-257

STEP 10. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector and 
A-131 alternator connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace the connector.

STEP 11. Check harness between A-114 (terminal 
No. 64) engine-ECU connector or 
engine-CVT-ECU connector and A-131 (terminal 
No. 1) alternator connector.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair the damaged harness wire.

STEP 12. Check the trouble symptom.

Q: Does trouble symptom persist?

YES : 

Replace alternator.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

AK402745

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L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side 
connector

AK402745

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4

2

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3

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L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side 
connector

Main

Index

Group

TOC

 

 

 

 

 

 

 

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