Mitsubishi Grandis. Manual - part 762

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-299

YES : 

Check intermediate connectors B-17 and 

C-18, and repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between C-307 (terminal No. 5) 
ignition switch connector and C-111 
(terminal No. 51) engine-ECU connector.

• Check output line for open/short 

circuit.

NO : 

Repair or replace.

STEP 9: Connector check: C-111 engine-A/T-ECU 
connector

Q: Is the check result normal?

YES : 

Check intermediate connectors B-17, and 

repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between B-111 (terminal No. 9) 
inhibitor switch connector and C-111 
(terminal No. 51) engine-A/T-ECU 
connector.

• Check output line for open/short 

circuit.

NO : 

Repair or replace.

STEP 10: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 22: Crank angle sensor 

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Check crank angle sensor system (Refer to 
Code No. P0335 

P.13A-157

).

STEP 11: Check injector for operating sound.

• Check injector for operating sound (Refer to 

P.13A-393

).

Q: Can operating sound be heard? 

YES : 

Go to Step 12 .

NO : 

Check the injector system of the defective 

cylinder.

(Refer to Code No. P0201: No. 1 injector 

system 

P.13A-115

.)

(Refer to Code No. P0202: No. 2 injector 

system 

P.13A-120

.)

(Refer to Code No. P0203: No. 3 injector 

system 

P.13A-125

.)

(Refer to Code No. P0204: No. 4 injector 

system 

P.13A-130

.)

STEP 12: Check ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Check ignition circuit system (Refer to 

Inspection Procedure 26

P.13A-355

)

STEP 13: Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel 

Pressure Test 

P.13A-383

).

Q: Is the check result normal?

YES : 

Go to Step 14 .

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

AK305632

8

9

3

4

5

1

2

6

7

10

 B-111 (B)

Connector: B-111

Harness side connector

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-300

STEP 14: Replace engine-ECU <M/T> or 
engine-A/T-ECU <A/T>

• After replacing the engine-ECU <M/T> or 

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

Inspection Procedure 7: Starting Impossible (Initial Combustion But No Complete Combustion), 
Improper Starting (Long Time to Start)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by poor ignition, 

incorrect air-fuel ratio at cranking, improper fuel 
pressure or other faults.

PROBABLE CAUSE

• Failed battery 

• Failed ignition system 

• Failed fuel system 

• Air-fuel ratio control

• Failed throttle valve control system

• Failed intake system 

• Failed exhaust gas cleaning system

• Throttle valve fouled around 

• Timing belt not in place 

• Compression pressure improper 

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1: Check battery condition.

Q: Have the battery terminal been disconnected? 

YES : 

After warm-up engine, idle for about 10 

minutes.

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 54 

− 

Battery 

− On-vehicle Service − Battery Test 

P.54A-6

).

STEP 3: MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis codes (Refer 

to 

P.13A-20

)

NO : 

Go to Step 4 .

STEP 4: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 12: Air flow sensor
b. Item 13: Intake air temperature sensor

c. Item 21: Engine coolant temperature 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: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 25: Barometric pressure sensor

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

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

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-383

).

STEP 7: MUT-III actuator test

• Item 07: Fuel pump 

OK: Operating sound of fuel pump can be 
heard.

Q: Is the check result normal?

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-301

YES : 

Go to Step 8 .

NO : 

Check fuel pump system (Refer to 
Inspection Procedure 23 

P.13A-328

).

STEP 8: Check air intake from intake hose and 
inlet manifold.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair.

STEP 9: Check injector for operating sound.

• Check injector for operating sound at engine 

cranking (Refer to 

P.13A-393

).

Q: Can operating sound be heard?

YES : 

Go to Step 10 .

NO : 

Check the injector system of the defective 

cylinder.

(Refer to Code No. P0201: No.1 Injector 

System 

P.13A-115

.) 

(Refer to Code No. P0202: No.2 Injector 

System 

P.13A-120

.) 

(Refer to Code No. P0203: No.3 Injector 

System 

P.13A-125

.) 

(Refer to Code No. P0204: No.4 Injector 

System 

P.13A-130

.) 

STEP 10. Check timing marks of timing belt.

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Align timing marks.

STEP 11: Check ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Check ignition circuit system (Refer to 
Inspection Procedure 26 

P.13A-355

).

STEP 12: Check spray condition of injector.

• Check each injector for spray condition (Refer to 

P.13A-393

).

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Replace injector.

STEP 13: 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 14 .

NO : 

Repair.

STEP 14: 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 15 .

NO : 

Replace EGR valve (stepper motor).

STEP 15: Replace engine-ECU <M/T> or 
engine-A/T-ECU <A/T>.

• After replacing the engine-ECU <M/T> or 

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

Inspection Procedure 8: Unstable Idling (Rough Idling, Hunting), Improper Idling Speed (Too High or 
too Low), Engine Stalls during Idling (Die Out)

COMMENT ON TROUBLE SYMPTOM

• Probable causes can be widely found in ignition 

system, air-fuel ratio control system, idle air 
control fuel system, etc. A sudden engine stall is 
possibly caused by poor connector contact.

PROBABLE CAUSE

• Failed ignition system

• Failed fuel system 

• Failed throttle valve control system 

• Failed intake/exhaust system

• Failed emission gas cleaning system

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

• Throttle valve body fouled 

• Timing belt out of place 

• Compression pressure improper 

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-302

DIAGNOSIS PROCEDURE

STEP 1: Check battery condition.

Q: Has the battery terminal been disconnected? 

YES : 

After warm-up engine, idle for about 10 

minutes. 

NO : 

Go to Step 2 .

STEP 2: MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-20

).

NO : 

Go to Step 3 .

STEP 3: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 12: Air flow sensor
b. Item 13: Intake air temperature sensor 

c. Item 14: Throttle position sensor (sub)

d. Item 21: Engine coolant temperature sensor 
e. Item 29: Inhibitor switch <A/T>

f. Item 77: Accelerator pedal position sensor 

(sub)

g. Item 78: Accelerator pedal position sensor 

(main)

h. Item 79: Throttle position sensor (main)

i. Item B4: Power steering fluid pressure sensor

Q: Are the check results normal?

YES : 

Go to Step 4  .

NO : 

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

STEP 4: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 25: Barometric pressure sensor

Q: Is the check results normal?

YES : 

Go to Step 5 .

NO : 

Replace engine - ECU.

STEP 5: Check air intake from intake hose and 
inlet manifold.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair.

STEP 6: Check timing marks of timing belt.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Align timing marks.

STEP 7: Check throttle body (throttle valve) 
contamination.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-383

).

STEP 8. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 11: Cylinder 1, 4 oxygen sensor (front)
b. Item 39: Cylinder 2, 3 oxygen sensor (front)

c. Item 59: Cylinder 1, 4 oxygen sensor (rear)

d. Item 69: Cylinder 2, 3 oxygen sensor (rear)

Q: Are the check results normal?

YES : 

Go to Step 9 .

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

).