Mitsubishi Colt Ralliart. Manual - part 76

 

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Mitsubishi Colt Ralliart. Manual - part 76

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-258

STEP 13. 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 15 .

NO : 

Go to Step 14 .

STEP 14. 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 15. Check purge control solenoid valve 
itself.

• Check purge control solenoid valve itself (Refer 

to GROUP 17 

− Emission Control System − 

Evaporative Emission Control System 

− Purge 

Control Solenoid Valve Check 

P.17-16

)

Q: Is the check result normal?

YES : 

Go to Step 16 <CVT> , go to Step 17 <M/T> 

.

NO : 

Replace purge control solenoid valve.

STEP 16. 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) Chec

P.17-20

].

Q: Is the check result normal?

YES : 

Go to Step 17 .

NO : 

Replace EGR valve (stepper motor).

STEP 17. Check injector for spray condition.

• Check each injector for spray condition (Refer to 

P.13A-364

).

Q: Is the check result normal?

YES : 

Go to Step 18 .

NO : 

Replace injector.

STEP 18. 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 19 .

NO : 

Repair.

STEP 19. Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

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

<CVT> is replaced, re-check for trouble symp-
tom.

Q: Does trouble system 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-259

Inspection Procedure 9: The engine stalls when starting the car (Pass out)

COMMENT ON TROUBLE SYMPTOM

• Engine stall on starting is possibly caused by mis-

fire due to failed spark plug, improper air-fuel 
ratio at accelerator pedal depression or other 
faults. 

PROBABLE CAUSES

• Failed ignition system

• Failed intake system

• Failed exhaust gas cleaning system

• Air drawn in from gaps in gasket, seals, etc.

• 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. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 14: Throttle position sensor (sub)
b. Item 77: Accelerator pedal position sensor 

(sub)

c. Item 78: Accelerator pedal position sensor 

(main)

d. Item 79: Throttle position sensor (main)

Q: Are the check results normal?

YES : 

Go to Step 3 .

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 3. Check air intake from intake hose and 
inlet manifold.

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Repair.

STEP 4. 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 6 <CVT> , replace engine-ECU 

<M/T>.

NO : 

Go to Step 5 .

STEP 5. 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 6. 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) Chec

P.17-20

].

Q: Is the check result normal? 

YES : 

Replace engine-CVT-ECU.

NO : 

Replace EGR valve (stepper motor).

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-260

Inspection Procedure 10: The engine stalls when decelerating

COMMENT ON TROUBLE SYMPTOM

• Engine stall on deceleration is possibly caused by 

insufficient air intake, improper air-fuel ratio due 
to failed exhaust gas recirculation (EGR) system 
<CVT> or other faults.

PROBABLE CAUSES

• Failed electronically controlled throttle valve sys-

tem

• Failed ignition system

• Failed emission control system

• Throttle valve fouled around

• 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. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 14: Throttle position sensor (sub)
b. Item 77: Accelerator pedal position sensor 

(sub)

c. Item 78: Accelerator pedal position sensor 

(main)

d. Item 79: Throttle position sensor (main)

Q: Are the check results normal? 

YES : 

Go to Step 3 .

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 3. Check throttle body (throttle valve 
portion) for contamination.

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-355

).

STEP 4. 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 6 <CVT> , Replace engine-ECU 

<M/T>.

NO : 

Go to Step 5 .

STEP 5. 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 6. 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) Chec

P.17-20

].

Q: Is the check result normal? 

YES : 

Replace engine-CVT-ECU.

NO : 

Replace EGR valve (stepper motor).

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-261

Inspection Procedure 11: Engine does not revolve up

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed fuel system, 

electronically controlled throttle valve system 
ignition system or other faults.

PROBABLE CAUSES

• Failed ignition system

• Failed fuel system

• Failed electronically controlled throttle valve sys-

tem

• Timing chain not in place

• 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. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 14: Throttle position sensor (sub)
b. Item 77: Accelerator pedal position sensor 

(sub)

c. Item 78: Accelerator pedal position sensor 

(main)

d. Item 79: Throttle position sensor (main)

Q: Are the check results normal?

YES : 

Go to Step 3 .

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 3. Check timing marks of timing chain.

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Align timing marks.

STEP 4. 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 6 .

NO : 

Go to Step 5 .

STEP 5. 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 6. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13A-355

).

Q: Is the check result normal?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Repair.

Main

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TOC

 

 

 

 

 

 

 

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