Mitsubishi Grandis. Manual — part 715
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-111
STEP 12. 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
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Replace purge control solenoid valve.
STEP 13. Fuel pressure measurement.
• Fuel pressure measurement (Refer to Fuel
Pressure Test
).
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Repair.
Code No. P0173: Abnormal Fuel System (cylinder 2, 3)
OPERATION
• Refer to Code No. P0202 No. 2 Injector System
.
• Refer to Code No. P0203 No. 3 Injector System
.
FUNCTION
• If the fuel system goes out of order, the fuel
correction value will become larger.
• The engine-ECU <M/T> or engine-A/T-ECU
<A/T> checks whether the fuel trim value is within
a specified range.
TROUBLE JUDGMENT
Check Condition
• In learning the air-fuel ratio
Judgment Criteria
• Long-term fuel trim has continued to be +12.5 %
or higher for 10 seconds.
Or
• Long-term fuel trim has continued to be -12.5 %
or lower for 10 seconds.
PROBABLE CAUSE
• Failed intake air temperature sensor
• Failed air flow sensor
• Failed purge control solenoid valve
• Failed injector
• Air drawn in from gaps in gasket, seals, etc.
• Failed engine coolant temperature sensor
• Failed barometric pressure sensor
• Exhaust leak
• Incorrect fuel pressure
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. MUT-III diagnosis code
Q: Is any other diagnosis code than P0173 output?
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 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 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: MUT-III data list
• Refer to Data List Reference Table
a. Item 25: Barometric pressure sensor
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
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
).
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-112
STEP 5. Check for intake of air from intake hose
and inlet manifold.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair.
STEP 6. Check for leakage of exhaust emission
from exhaust manifold.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
STEP 7. Connector Check: Injector connector
a. B-102 (No. 2 injector connector).
b. B-104 (No. 3 injector connector).
Q: Are the check results normal?
YES :
Go to Step 8 .
NO :
Repair or replace.
STEP 8. Check No.2 and No.3 injector itself.
• Check No.2 and No.3 Injector itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Replace injector.
STEP 9. Connector check: B-15X engine control
relay connector and C-110 engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace.
AK300978
M
1
2
B-102 (GR)
B-104 (GR)
AI
Harness side connector
Connectors: B-102, B-104
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK305618AB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-113
STEP 10. Check harness between B-15X engine
control relay connector and injector connector.
a. Check intermediate connector C-116, and repair
if necessary. If intermediate connector is normal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-102
(terminal No. 1) No. 2 injector connector.
b. Check intermediate connector C-116, and repair
if necessary. If intermediate connector is normal,
check harness between B-15X (terminal No. 1)
engine control relay connector and B-104
(terminal No. 1) No. 3 injector connector.
• Check power supply line for damage.
Q: Are the check results normal?
YES :
Go to Step 11 .
NO :
Repair or replace.
STEP 11. Check harness between injector
connector and C-110 engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.
a. Check harness between B-102 (terminal No. 2)
No. 2 injector connector and C-110 (terminal No.
5) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
b. Check harness between B-104 (terminal No. 2)
No. 3 injector connector and C-110 (terminal No.
14) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
Q: Are the check results normal?
YES :
Go to Step 12 .
NO :
Repair.
AK300978
M
1
2
B-102 (GR)
B-104 (GR)
AI
Harness side connector
Connectors: B-102, B-104
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300978
M
1
2
B-102 (GR)
B-104 (GR)
AI
Harness side connector
Connectors: B-102, B-104
AK305618AB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-114
STEP 12. 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
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Replace purge control solenoid valve.
STEP 13. Fuel pressure measurement.
• Fuel pressure measurement (Refer to Fuel
Pressure Test
).
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Repair.
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