Mitsubishi Grandis. Manual — part 706
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-75
YES :
Check and repair harness between B-23
(terminal No. 4) cylinder 1, 4 oxygen sensor
(rear) connector and C-113 (terminal No.
117) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
• Check output line for open circuit.
NO :
Repair or replace.
STEP 12. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace.
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-76
Code No. P0141: Cylinder 1, 4 Oxygen Sensor (Rear) Heater System
OPERATION
• Power is supplied to the heater power terminal
(terminal No. 1) of the cylinder 1, 4 oxygen
sensor (rear) connector from the engine control
relay (terminal No. 1).
• The heater (terminal No. 3) of the cylinder 1, 4
oxygen sensor (rear) connector is controlled by
the power transistor in the engine-ECU <M/T> or
engine-A/T-ECU <A/T> (terminal No. 24).
FUNCTION
• The power supply to the cylinder 1, 4 oxygen
sensor (rear) heater is controlled by the ON/OFF
control of the power transistor in the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
• Heating the cylinder 1, 4 oxygen sensor (rear)
heater enables the cylinder 1, 4 oxygen sensor
(rear) to provide good response even when the
exhaust emission temperature is low.
AK305554
1
2
3
4
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
1
2
3
4
AB
4
3
1
2
Cylinder 1, 4 oxygen sensor (rear)
1
2
3
4
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
24
Engine
control
relay
W-G
R-W
R-W
G-W
W-G
Battery
B-15X
C-110
(MU803802)
Cylinder 1,4 oxygen sensor (rear) heater circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
B-23
MU802605
J/C (4)
C-116
To engine-ECU <M/T> or
engine-A/T-ECU <A/T>
11
7
To engine-ECU <M/T> or
engine-A/T-ECU <A/T>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-77
TROUBLE JUDGMENT
Check Conditions
• 60 seconds have elapsed since the previous
monitoring started.
• Engine coolant temperature is 20°C or higher.
• While cylinder 1, 4 oxygen sensor (rear) heater is
on.
• Battery positive voltage is 11 − 16 V.
Judgment Criterion
• Cylinder 1, 4 oxygen sensor (rear) heater
currents have continued to be 0.16 A or lower, or
5.0 A or higher for 4 seconds.
PROBABLE CAUSE
• Failed cylinder 1, 4 oxygen sensor (rear) heater
• Open/short circuit in cylinder 1, 4 oxygen sensor
(rear) heater circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-23 cylinder 1, 4
oxygen sensor (rear) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at B-23
cylinder 1, 4 oxygen sensor (rear) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal No. 1 and No. 3.
OK: 11
− 18 Ω
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace cylinder 1, 4 oxygen sensor (rear).
AK300975
1
2
3
4
AC
B-23 (B)
Connector: B-23
Harness side
connector
Cylinder 1, 4 oxygen
sensor (rear)
AK300975
1
2
3
4
AC
B-23 (B)
Connector: B-23
Harness side
connector
Cylinder 1, 4 oxygen
sensor (rear)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-78
STEP 3. Perform voltage measurement at B-23
cylinder 1, 4 oxygen sensor (rear) 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-23 (terminal No. 1)
cylinder 1, 4 oxygen sensor (rear) connector
and B-15X (terminal No. 1) engine control
relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
AK300975
1
2
3
4
AC
B-23 (B)
Connector: B-23
Harness side
connector
Cylinder 1, 4 oxygen
sensor (rear)
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300975
1
2
3
4
AC
B-23 (B)
Connector: B-23
Harness side
connector
Cylinder 1, 4 oxygen
sensor (rear)
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