Mitsubishi Colt Ralliart. Manual - part 718

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-197

STEP 2. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item No. 78: Accelerator pedal position sen-

sor (main)

b. Item No. 77: Accelerator pedal position sen-

sor (sub)

Q: Are the check results normal?

YES : 

Replace engine-ECU.

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.13B-18

). 

Code No. P1238: Air Flow Sensor Trustful For Torque Monitoring

FUNCTION

• Compare the actual measurement of volumetric 

efficiency by an air flow sensor signal with volu-
metric efficiency estimated from a throttle position 
sensor (main or sub) signal.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in "ON" position.

• While engine is running.

• Throttle position sensor (main or sub) is normal.

Judgment Criteria

• The difference between volumetric efficiency esti-

mated from the throttle position sensor (main) 
and volumetric efficiency estimated from the 
throttle position sensor (sub) exceeds the speci-
fied value.

• The difference between volumetric efficiency 

(actual measurement) by the air flow sensor and 
volumetric efficiency estimated from the throttle 
position sensor (main) exceeds the specified 
value.

• The difference between volumetric efficiency 

(actual measurement) by the air flow sensor and 
volumetric efficiency estimated from the throttle 
position sensor (sub) exceeds the specified 
value.

PROBABLE CAUSES

• Failed air flow sensor

• Damage in air flow sensor circuit or loose con-

nector contact

• Failed intake air system

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is any other diagnosis code than P1238 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 No. 12: Air flow sensor

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Check air flow sensor system (Refer to 
Code No. P0100 

P.13B-31

).

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-198

Code No. P1239: Trustful Check Engine Speed

FUNCTION

• Compare the actual engine speed through the 

crank angle sensor signal trip with the assumed 
engine speed through the crank angle sensor sig-
nal pulse number after the specified period.

TROUBLE JUDGMENT

Check Condition

• While engine is running.

Judgment Criterion

• Difference is more than 500 r/min between actual 

engine speed and supposed engine speed.

PROBABLE CAUSE

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• After clearing the diagnosis code through 

M.U.T.-III, start the engine and confirm whether 
the diagnosis code is output.

Q: Diagnosis code set?

YES : 

Replace engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

Code No. P1240: Trustful Check Engine Speed <Vehicle with ASC>

FUNCTION

• The ignition timing retard request signal is abnor-

mal from ASC-ECU. 

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position. 

Judgment Criterion

• Retard request signal for ignition timing is abnor-

mal.

PROBABLE CAUSES

• Failed ASC-ECU

• Failed CAN

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is diagnosis code related with CAN communication 

displayed?
YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13B-18

).

NO : 

Go to Step 2 .

STEP 2. M.U.T.-III other system diagnosis code

• Confirm whether the diagnosis codes are output 

from ASC-ECU.

Q:  Is the diagnosis code output?

YES : 

Perform the troubleshooting of ASC (Refer 

to Group 35C 

−Troubleshooting − Diagnosis 

Code Chart 

P.35C-6

).

NO : 

Replace engine-ECU.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-199

Code No. P1241: Torque Monitoring

FUNCTION

• Compare the difference between the actual 

torque signal and the requested torque signal.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position. 

Judgment Criterion

• Difference is more than specified value between 

actual torque signal and target torque signal.

PROBABLE CAUSE

• Failed air flow sensor

• Failed accelerator pedal position sensor

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

• Failed throttle valve control servo

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Diagnosis code set?

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 No. 78: Accelerator pedal position sen-

sor (main)

b. Item No. 77: Accelerator pedal position sen-

sor (sub)

c. Item No. 12: Air flow sensor

Q: Is 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.13B-18

).

STEP 3. Check for intake of air from gaps in 
gasket, seals, etc.

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair for intake of air from gaps in gasket, 
seals, etc.

STEP 4. Check the throttle valve control servo 
itself.

• Check the throttle valve control servo itself (Refer 

to 

P.13B-368

)

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Replace the throttle body assembly.

STEP 5. Connector check: A-107 
electronic-controlled throttle valve connector 
and A-114 engine-ECU connector.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

AK402086

1

6 5 4 3 2

A-107(B)

AC

Connector: A-107

Harness side 

connector

AK402745

6

4

2

5

3

1

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L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-200

STEP 6. Check harness between A-107 (terminal 
No. 6) electronic-controlled throttle valve 
connector and A-114 (terminal No. 7) engine-ECU 
connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Check harness between A-107 (terminal 
No. 5) electronic-controlled throttle valve 
connector and A-114 (terminal No. 22) 
engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the damaged harness wire.

STEP 8. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

AK402086

1

6 5 4 3 2

A-107(B)

AC

Connector: A-107

Harness side 

connector

AK402745

6

4

2

5

3

1

9

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L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

AK402086

1

6 5 4 3 2

A-107(B)

AC

Connector: A-107

Harness side 

connector

AK402745

6

4

2

5

3

1

9

7

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10

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62

63

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66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC