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
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
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
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-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
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
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
].
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
).
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
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
NO :
Go to Step 2 .
STEP 2. MUT-III data list
• Refer to Data List Reference Table
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
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
].
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
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
NO :
Go to Step 2 .
STEP 2. MUT-III data list
• Refer to Data List Reference Table
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
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
].
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
).
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
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
NO :
Go to Step 2 .
STEP 2. MUT-III data list
• Refer to Data List Reference Table
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
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
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