Mitsubishi Colt Ralliart. Manual — part 74

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-250

STEP 15. Check harness between A-124 (terminal
No. 1) starter connector and battery.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Replace starter.

NO :

Repair the damaged harness wire.

Inspection Procedure 6: Starting impossible (Starter operative but no initial combustion)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed ignition cir-

cuit, failed fuel feed or other faults.

PROBABLE CAUSES

• Failed battery

• Timing chain broken

• Throttle valve fouled around

• Failed ignition system

• Failed fuel system

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

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Measure battery voltage at cranking.

OK: 8 V or higher

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. With M.U.T.-III of communication.

• Confirm the communication available M.U.T. -III

and engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Check engine-ECU <M/T> or
engine-CVT-ECU <CVT> power supply,
engine control relay and ignition switch IG1
system (Refer to Inspection Procedure 23

P.13A-281

).

STEP 3. M.U.T.-III diagnosis code

Q: Is the diagnosis code set?

YES :

Inspection chart for diagnosis codes (Refer

to

P.13A-20

)

NO :

Go to Step 4 .

STEP 4. M.U.T.-III actuator test

• Item 07: Fuel pump

OK: Operating sound of fuel pump can be
heard.

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Check fuel pump system (Refer to
Inspection Procedure 24

P.13A-289

)

AK402056

1

Connector: A-124

A-124 Harness side
connector

AC

A-124

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-251

STEP 5. Check timing chain for breakage.

• Engine: Cranking

OK: Camshaft rotates.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Replace timing chain.

STEP 6. Check throttle body (throttle valve)
contamination.

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Clean throttle body (throttle valve portion)
(Refer to

P.13A-355

).

STEP 7. M.U.T.-III data list

• Item 18: Cranking signal

OK:

ON (Ignition switch: ST)
OFF (Ignition switch: ON)

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Go to Step 8 .

STEP 8. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES :

Check and repair harness between A-125

(terminal No. 1) inhibitor switch connector
and A-114 (terminal No. 39) engine-ECU
connector or engine-CVT-ECU connector.

• Check output line for open circuit and

damage.

NO :

Repair or replace the connector.

STEP 9. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-331

.

a. Item 22: Crank angle sensor

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Check crank angle sensor system (Refer to
Code No. P0

P.13A-134

).

AK402745

6

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L

AD

A-114

Connector:

A-114

Harness side connector

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

Battery

AK402055

1

Connector: A-125

A-125 Harness side
connector

AC

A-125 (B)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-252

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 injector for operating sound.

• Check injector for operating sound (Refer to

P.13A-364

).

Q: Can operating sound be heard?

YES :

Go to Step 13 .

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 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. 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-253

Inspection Procedure 7: Starting impossible (Initial combustion but no complete combustion),
starting impossible (Long time to start)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by poor ignition, incor-

rect air-fuel ratio at cranking, improper fuel pres-
sure or other faults.

PROBABLE CAUSES

• Failed battery

• 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 not in place

• Compression pressure improper

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

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. Check battery condition.

Q: Have 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. Check battery voltage.

• Measure battery voltage at cranking.

OK: 8 V or higher

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Check battery (Refer to GROUP 54A

−

Battery

− On-vehicle Service − Battery Test

P.54A-5

).

STEP 3. M.U.T.-III diagnosis code

Q: Is the diagnosis code set?

YES :

Inspection chart for diagnosis codes (Refer

to

P.13A-20

)

NO :

Go to Step 4 .

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 throttle body (throttle valve)
contamination.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Clean throttle body (throttle valve portion)
(Refer to

P.13A-355

).

STEP 6. M.U.T.-III actuator test

• Item 07: Fuel pump

OK: Operating sound of fuel pump can be
heard.

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Check fuel pump system (Refer to
Inspection Procedure 24

P.13A-289

).

STEP 7. Check air intake from intake hose and
inlet manifold.

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair.

Main

Index

Group

TOC