Mitsubishi Grandis. Manual - part 763

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-303

STEP 9. Perform voltage measurement at C-111 
engine-ECU <M/T> connector or engine-A/T-ECU 
<A/T> connector.

• Measure engine-ECU <M/T> or engine-A/T-ECU 

<A/T> terminal voltage.

• Engine: Idling after warm-up

• Transmission: Neutral <M/T> or P range <A/T>

• Radiator fan: Not operating

• Voltage between terminal No. 45 and earth.

OK: Switching the headlamps to ON from 
OFF causes the voltage to increase.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Go to Step 10 .

STEP 10. Connector check: C-111 engine-ECU 
<M/T> connector or engine-A/T-ECU <A/T> 
connector and B-119 alternator connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

35

36

37

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39

40

41

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44

45

46

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49

52

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58

50

51

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

52

53

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58

50

51

AK300990

2

1

3

4

AC

B-119 (GR)

Connector: B-119

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-304

STEP 11. Check harness between C-111 (terminal 
No. 45) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector and B-119 
(terminal No. 1) alternator connector.

NOTE: Before checking harness, check intermediate 
connector B-17, and repair if necessary.

• Check output line for open/short circuit and 

damage.

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair.

STEP 12. Replace alternator

• After alternator is replaced, re-check for trouble 

symptom.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU <M/T> or 

engine-A/T-ECU <A/T>.

NO : 

Check end.

STEP 13.Check spark plug

Q: Is the check result normal?

YES : 

Go to Step 14 .

NO : 

Replace spark plug.

STEP 14. Check ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Check ignition circuit system (Refer to 
Inspection Procedure 26 

P.13A-355

).

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.17-62

)

Q: Is the check result normal?

YES : 

Go to Step 16 .

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.17-65

].

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-393

).

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 

Pressure Check 

P.11A-13

).

Q: Is the check result normal?

YES : 

Go to Step 19 .

NO : 

Repair.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

51

AK300990

2

1

3

4

AC

B-119 (GR)

Connector: B-119

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-305

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

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

<A/T> is replaced, re-check for trouble symptom.

Q: Does trouble system persist?

YES : 

Check for foreign matters (water, kerosene, 

etc.) in fuel and replace if necessary.

NO : 

Check end.

Inspection Procedure 9: The Engine Stalls when Starting the Car (Pass Out)

COMMENT ON TROUBLE SYMPTOM

• Engine stall on starting is possibly caused by 

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

PROBABLE CAUSE

• Failed ignition system

• Failed intake system

• Failed emission gas cleaning system

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

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-20

).

NO : 

Go to Step 2 .

STEP 2. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

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 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.17-65

].

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Replace EGR valve (stepper motor).

STEP 4. Check air intake from intake hose and 
inlet manifold.

Q: Is the check result normal? 

YES : 

Go to Step 5 .

NO : 

Repair.

STEP 5. Check ignition coil spark.

Q: Is the check result normal? 

YES : 

Replace engine-ECU <M/T> or 

engine-A/T-ECU <A/T>.

NO : 

Check ignition circuit system (Refer to 
Inspection Procedure 26 

P.13A-355

).

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 system or 
other faults.

PROBABLE CAUSE

• Failed throttle valve control system

• Failed ignition system

• Failed emission control system

• Throttle valve fouled 

• Failed engine-ECU <M/T>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-306

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-20

).

NO : 

Go to Step 2 .

STEP 2. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

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 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.17-65

].

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Replace EGR valve (stepper motor).

STEP 4. Check throttle body (throttle valve 
portion) for contamination.

Q: Is the check result normal? 

YES : 

Go to Step 5 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-383

).

STEP 5. Check ignition coil spark.

Q: Is the check result normal? 

YES : 

Replace engine-ECU <M/T> or 

engine-A/T-ECU <A/T>.

NO : 

Check ignition circuit system (Refer to 
Inspection Procedure 26 

P.13A-355

).

Inspection Procedure 11: Engine Does Not Revole Up

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed fuel system, 

throttle valve opening control system ignition 
system or other faults.

PROBABLE CAUSE

• Failed ignition system

• Failed fuel system

• Failed throttle valve opening control system

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-20

).

NO : 

Go to Step 2 .

STEP 2. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

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 ignition coil spark.

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Check ignition circuit system (Refer to 
Inspection Procedure 26 

P.13A-355

).