Mitsubishi Colt Ralliart. Manual - part 733

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-257

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

• Disconnect engine-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: Neutral

• 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 .

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

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace.

AK402745

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AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

AK402745

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AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

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AK402098

A-131(G)

Connector: A-131

Harness side 
connector

AC

Main

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Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-258

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

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

age.

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair.

STEP 12. Check the trouble symptom.

Q: Does trouble symptom recur?

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

).

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 

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.

STEP 15. Check purge control solenoid valve.

• Check purge control solenoid valve (Refer to 

GROUP 17 

− Emission Control System − Evapora-

tive Emission Control System 

− Purge Control 

Solenoid Valve Check 

P.17-16

).

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Replace purge control solenoid valve.

STEP 16. 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 17 .

NO : 

Replace injector.

STEP 17. Check compression pressure.

• Check compression pressure (Refer to GROUP 

11C 

− On-vehicle Service − Compression Pressure 

Check 

P.11C-13

).

Q: Is the check result normal?

YES : 

Go to Step 18 .

NO : 

Repair.

STEP 18. Replace engine-ECU

• After engine-ECU is replaced, re-check for trou-

ble symptom.

Q: Does trouble symptom recur?

YES : 

Check for foreign matters (water, kerosene, 

etc.) in fuel and replace if necessary.

NO : 

Check end.

AK402745

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AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

2

1

3

4

AK402098

A-131(G)

Connector: A-131

Harness side 
connector

AC

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-259

Inspection Procedure 8: 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.

• Engine stall on deceleration is possibly caused by 

improper air-fuel ratio due to lack of intake air or 
failed EGR system.

PROBABLE CAUSES

• Failed ignition system

• Failed intake system

• Failed emission gas cleaning system

• Throttle valve fouled around

• 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. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

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 to Diagnosis Code 

P.13B-18

).

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. Check throttle body (throttle valve) for 
contamination.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Clean throttle body (throttle valve) (Refer to 

P.13B-358

).

STEP 5. 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 : 

Replace engine-ECU.

NO : 

Go to Step 6 .

STEP 6. 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-260

Inspection Procedure 9: Engine Does Not Revole Up

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed electronically 

controlled throttle valve system, fuel system, igni-
tion system, or other faults.

PROBABLE CAUSES

• Failed ignition system

• Failed fuel system

• Failed electronically controlled throttle valve sys-

tem

• Incorrectly installed timing belt

• 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. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

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 to Diagnosis Code 

P.13B-18

).

STEP 3. Check timing marks of timing belt.

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 

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.

STEP 6. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13B-358

).

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Repair.

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