Mitsubishi Grandis. Manual — part 710
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-91
STEP 3. Perform voltage measurement at B-19
cylinder 2, 3 oxygen sensor (front) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
STEP 4. Connector check: B-15X engine control
relay connector
Q: Is the check result normal?
YES :
Check intermediate connector C-116, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-19 (terminal No. 1)
cylinder 2, 3 oxygen sensor (front)
connector and B-15X (terminal No. 1)
engine control relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
AK300976
1
2
3
4
AC
B-19 (GR)
Connector: B-19
Harness side
connector
Cylinder 2, 3 oxygen
sensor (front)
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300976
1
2
3
4
AC
B-19 (GR)
Connector: B-19
Harness side
connector
Cylinder 2, 3 oxygen
sensor (front)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-92
STEP 5. Perform voltage measurement at C-110
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.
• Ignition switch: ON
• Voltage between terminal No. 10 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector check: 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 7 .
NO :
Repair or replace.
AK305618AB
1
2
3
4
5
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8
9
10
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15
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19
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26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
AK305618AB
1
2
3
4
5
6
7
8
9
10
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12
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15
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19
20
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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-93
STEP 7. Check harness between B-19 (terminal
No. 3) cylinder 2, 3 oxygen sensor (front)
connector and C-110 (terminal No. 10)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Repair.
STEP 8. Connector check: 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 9 .
NO :
Repair or replace.
AK300976
1
2
3
4
AC
B-19 (GR)
Connector: B-19
Harness side
connector
Cylinder 2, 3 oxygen
sensor (front)
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
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-94
STEP 9. Check harness between B-19 (terminal
No. 1) cylinder 2, 3 oxygen sensor (front)
connector and B-15X (terminal No. 1) engine
control relay connector.
NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
STEP 10. Check harness between B-19 (terminal
No. 3) cylinder 2, 3 oxygen sensor (front)
connector and C-110 (terminal No. 10)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
AK300976
1
2
3
4
AC
B-19 (GR)
Connector: B-19
Harness side
connector
Cylinder 2, 3 oxygen
sensor (front)
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300976
1
2
3
4
AC
B-19 (GR)
Connector: B-19
Harness side
connector
Cylinder 2, 3 oxygen
sensor (front)
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
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