Mitsubishi Colt Ralliart. Manual — part 76

Q: Is the check result normal?

YES :

Check ignition circuit system (Refer to

Inspection Procedure 28

)

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) Check

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

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

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

Q: Is the check result normal?

YES :

Check ignition circuit system (Refer to

Inspection Procedure 28

)

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) Check

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

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

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

Q: Is the check result normal?

YES :

Check ignition circuit system (Refer to

Inspection Procedure 28

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) Check

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

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

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

Q: Is the check result normal?

YES :

Check ignition circuit system (Refer to

Inspection Procedure 28